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目录

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本章小结  

    本章主要论述了数组、指针和引用。在C + +语言中，它们是相互交织在一起的，对其中一个概念的理解有助于对其他槪念的理解。

      数组是一个由若干相同类型数据组成的集合，数组中特定的元素通过下标来访问。数组可以具有一维到多维的多种类型，一维数组是最常见的，字符数组是最常使用的，它可以用来保存字符串。标准c++语言没有定义内置的字符串数据类型，而是将字符串作为字符数组来实现。 数组为创建相关变量的列表提供了一种便利的方法。数组由连续存储单元组成，它的起始地址对应于数组的第一个元素，数组名本身是数组的首地址，它使得数组作为函数参数来传递从空间 利用上显得更合理。       在C++中，数组和指针有着密切的关系。指针是一个包含内存地址的对象，它不仅仅是地址，还与所指对象类型相关。通常，指针被用来访问另一个对象的值，这个另外的对象常常是一个数组，当程序把一个数组传递给函数时，C++实际上把数组第一个元素的地址传递给该函数3 通过递增指针的值，可以使指针直接指向数组的下一个元素。       引用是C++独有的特性，引用实质上就是另一个变量的别名。 使用new和delete运算符可以进行动态存储分配。这样，程序就能在运行时指定所申请内存空间的大小。

 

程序清单

4.1 arrayone.cpp   使用数组

// arrayone.cpp -- small arrays of integers#include "stdafx.h"#include 
   
    int main(){    using namespace std;    int yams[3];    //creates array with three elements    yams[0] = 7;    //assign value to first element    yams[1] = 8;    yams[2] = 6;    int yamcosts[3] = {20,30,5};//create, initialize array    //NOTE:if your C++ compiler or translator can't initialize this array,use static int         yamcosts[3] instead of int yamcosts[3]    cout << "Total yams = ";    cout << yams[0] + yams[1] + yams[2] << endl;    cout << "The package with " << yams[1] << " yams costs ";    cout << yamcosts[1] << " cents per yam.\n";    int total = yams[0] * yamcosts[0] + yams[1] * yamcosts[1];    total = total + yams[2] * yamcosts[2];    cout << "The total yam expense is " << total << " cents.\n";    cout << "\nSize of yams array = " << sizeof yams;    cout << " bytes.\n";    cout << "Size of one element = " << sizeof yams[0];    cout << " bytes.\n";    return 0;}
   

4.2  string.cpp   使用cstring

//string.cpp -- storing strings in an array#include "stdafx.h"#include 
   
    #include 
    
     int main(){    using namespace std;    const int Size = 15;    char name1[Size];             //empty array    char name2[Size] = "C++owboy";//initialized array    //NOTE:some implementations may require the static keyword to initialize the array name2    cout << "Howdy! I'm " << name2 << "! What's your name?\n";    cin >> name1;    cout << "well, " << name1 << ", your name has ";    cout << strlen(name1) << " letters and is stored\n";    cout << "in an array of " << sizeof(name1) << " bytes \n";    cout << "Your initial is " << name1[0] << ".\n";    name2[3] = '\0';             //set to null character    cout << "Here are the firsr 3 charaters of my name: ";    cout << name2 << endl;    return 0;}
    
   

4.3  instr1.cpp   字符串输入

//instr1.cpp -- reading more than one string#include "stdafx.h"#include 
   
    int main(){    using namespace std;    const int ArSize = 20;    char name[ArSize];    char dessert[ArSize];    cout << "Enter your name:\n";    cin >> name;    cout << "Enter your favorite dessert:\n";    cin >> dessert;    cout << "I have some delicious " << dessert << " for you. " << name << ".\n";    return 0;}//输入时如果有空格，就相当于输入了两个数组，因为cin在识别输入时，是将字符串放到数组中，并自动在结尾添加空字符
   

4.4  instr2.cpp   使用cin.getline

//instr2.cpp -- reading more than one word with getline#include "stdafx.h"#include 
   
    int main(){    using namespace std;    const int ArSize = 20;    char name[ArSize];    char dessert[ArSize];    cout << "Enter your name:\n";    cin.getline(name, ArSize);//reads through newline    cout << "Enter your favorite dessert:\n";    cin.getline(dessert, ArSize);    cout << "I have some delicious " << dessert;    cout << " for you. " << name << " .\n";    return 0;}//getline()函数每次读取一行
   

4.5  instr3.cpp   拼接方式

//instr3.cpp -- reading more than one word with get() & get()#include "stdafx.h"#include 
   
    int main(){    using namespace std;    const int ArSize = 20;    char name[ArSize];    char dessert[ArSize];    cout << "Enter your name:\n";    cin.get(name, ArSize).get();//reads string,newline    cout << "Enter your favorite dessert:\n";    cin.get(dessert, ArSize).get();    cout << "I have some delicious " << dessert;    cout << " for you. " << name << " .\n";    return 0;}
   

4.6   numstr.cpp  混合字符串和数字

//numstr.cpp -- following number input with line input#include "stdafx.h"#include 
   
    int main(){    using namespace std;    cout << "What year was your house built?\n";    int year;    cin >> year;    cout << "What is its street address?\n";    char address[80];    cin.getline(address, 80);    cout << "Year built: " << year << endl;    cout << "Address: " << address << endl;    cout << "Done!\n";    return 0;}
   

4.7   strtype1.cpp  string类

//strtype1.cpp -- using the C++ string class#include "stdafx.h"#include 
   
    #include 
    
                   //make string class availableint main(){    using namespace std;    char charr1[20];           //create an empty array    char charr2[20] = "jaguar";//create an initialized array    string str1;               //create an empty string object 可以声明为简单变量而不是数组    string str2 = "panther";   //create an initialized string    cout << "Enter a kind of feline: ";    cin  >> charr1;    cout << "Enter another kind of feline: ";    cin  >> str1;              //use cin for input    cout << "Here are some felines:\n";    cout << charr1 << " " << charr2 << "" << str1 << " " << str2 << endl;      //use cout     for output    cout << "The third letter in " << charr2 << " is " << charr2[2] << endl;    cout << "The third letter in " << str2 << " is "    << str2[2] << endl;   //use array notation    return 0;}
    
   

4.8   strtype2.cpp  string类

//strtype2.cpp -- assigning,adding,and appending#include "stdafx.h"#include 
   
    #include 
    
      //make string class availableint main(){    using namespace std;    string s1 = "penguin";    string s2, s3;    cout << "You can assign one string object to another: s2 = s1\n";    s2 = s1;    cout << "s1: " << s1 << ", s2:" << s2 << endl;    cout << "You can assign a C-style string to a string object.\n";    cout << "s2 = \"buzzard\"\n";    s2 = "buzzard";    cout << "s2: " << s2 << endl;    cout << "You can concatenate strings: s3 = s1 + s2\n";    s3 = s1 + s2;    cout << "s3: " << s3 << endl;    cout << "You can append strings.\n";    s1 += s2;    cout << "s1 += s2 yields s1 = " << s1 << endl;    s2 += " for a day";    cout << "s2 += \"for a day\" yields s2 = " << s2 << endl;    return 0;}
    
   

4.9   strtype3.cpp  string类

//strtype3.cpp -- more string class features#include "stdafx.h"#include 
   
    #include 
    
                   //make string class available#include 
     
                   //C-style string libraryint main(){    using namespace std;    char charr1[20];           //create an empty array    char charr2[20] = "jaguar";//create an initialized array    string str1;               //create an empty string object 可以声明为简单变量而不是数组    string str2 = "panther";   //create an initialized string    //assignment for string objects and character arrays    str1 = str2;               //copy str2 to str1     strcpy(charr1, charr2);    //copy charr2 to charr1    //appending for string objects and character arrays    str1 += " paste";          //add paste to end of strl    strcat(charr1, " juice");  //add juice to end of charr1        //finding the length of a string object and aC-style string    int len1 = str1.size();    //obtain length of str1    int len2 = strlen(charr1); //obtain length of charr1    cout << "The string " << str1 << " contains " << len1 << " characters.\n";    cout << "The string " << charr1 << " contains " << len2 << " characters.\n";    return 0;}//strcpy和strcat函数可能会报错：error C4996: : This function or variable may be unsafe. Consider using fopen_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.//解决方法：https://jingyan.baidu.com/article/ce436649fd61543773afd32e.html
     
    
   

4.10  strtype4.cpp   string类

//strtype4.cpp -- line input#include "stdafx.h"#include 
   
    #include 
    
                   //make string class available#include 
     
                   //C-style string libraryint main(){    using namespace std;    char charr[20];    string str;    cout << "Length of string in charr before input: " << strlen(charr) << endl;//对于未被初始化的数据，第一个空字符的出现位置是随机的，因此得到的结果可能不同    cout << "Length of string in str before input: "    << str.size() << endl;    cout << "Enter a line of text:\n";    cin.getline(charr, 20); //indicate maximum length    cout << "You entered: " << charr << endl;    cout << "Enter another line of text:\n";    getline(cin, str);//cin now an argument ; no length specifier    cout << "You entered: " << str << endl;    cout << "Length of string in charr after input: " << strlen(charr) << endl;    cout << "Length of string in str after input: " << str.size() << endl;    return 0;}
     
    
   

4.11  structur.cpp  初始化结构

//structur.cpp -- a simple structure#include "stdafx.h"#include 
   
    struct inflatable//structure declaration{    char name[20];    float volume;    double price;};int main(){    using namespace std;    inflatable guest =    {        "Glorious Gloria",//name value        1.88,// volume value        29.99//price value    };//guest is a structure variable of type inflatable        //It's initialized to the indicated values    inflatable pal =    {        "Audacious Arthur",        3.12,        32.99    };    //pal is a second variable of type inflatable    //NOTE:some implementations require using    //static inflatable guest =    cout << "Expand your guest list with " << guest.name;    cout << " and " << pal.name << "!\n";//pal.name is the name member of the pal variable    cout << "You can have both for $";    cout << guest.price + pal.price << "!\n";    return 0;}
   

4.12   assgn_st.cpp   结构赋值

//assgn_st.cpp--assigning structures#include "stdafx.h"#include 
   
    struct inflatable{    char name[20];    float volume;    double price;};int main(){    using namespace std;    inflatable bouquet =    {        "sunflowers",        0.20,        12.49    };//注意加分号    inflatable choice;    cout << "bouquet: " << bouquet.name << " for $";    cout << bouquet.price << endl;    choice = bouquet;    cout << "choice: " << choice.name << " for $";    cout << choice.price << endl;    return 0;};
   

4.13   arrstruc.cpp   结构数组

//arrstruc.cpp -- an array of structures#include "stdafx.h"#include 
   
    struct inflatable{    char name[20];    float volume;    double price;};int main(){    using namespace std;    inflatable guests[2]=    {        {"Bambi",0.5,21.99},        {"Godzilla",2000,565.99}    };    cout << "The guests " << guests[0].name << " and " << guests[1].name << "\nhave a combined volume of " << guests[0].volume + guests[1].volume << " cubic feet.\n";    return 0;}
   

4.14    address.cpp   &运算符的用法

//address.cpp -- using the & operator to find address#include "stdafx.h"#include 
   
    int main(){    using namespace std;    int donuts = 6;    double cups = 4.5;    cout << "donuts value = " << donuts;    cout << " and donuts address = " << &donuts << endl;    //NOTE:you may need to use unsigned (&donuts) and unsigned (&cups)    cout << "cups value = " << cups;    cout << " and cups address = " << &cups << endl;    return 0;}
   

4.15    pointer.cpp   声明指针

//pointer.cpp -- our first pointer variable#include "stdafx.h"#include 
   
    int main(){    using namespace std;    int updates = 6;//declare a variable    int * p_updates;//declare pointer to an int    p_updates = &updates;//assign address of int to pointer    //express values two ways    cout << "Values: updates = " << updates;    cout << " , p_updates = " << *p_updates << endl;    //express address two ways    cout << "Addresses: &updates = " << &updates;    cout << ", p_updates = " << p_updates << endl;    //use pointer to change value    *p_updates = *p_updates + 1;    cout << "Now updates = " << updates << endl;    return 0;}
   

4.16   init_ptr.cpp  将指针初始化为一个地址

//init_ptr.cpp -- initialize a pointer#include "stdafx.h"#include 
   
    int main(){    using namespace std;    int higgens = 5;    int * pt = &higgens;    cout << "Value of higgens = " << higgens << "; Address of higgens = " << &higgens << endl;    cout << "Value of *pt = " << *pt<< "; Value of pt = " << pt << endl;    return 0;}
   

4.17   use_new.cpp   new用于两种不同类型

//use_new.cpp -- using the new operator#include "stdafx.h"#include 
   
    int main(){    using namespace std;    int nights = 1001;    int * pt = new int;    *pt = 1001;    cout << "night value = ";    cout << nights << ": location " << &nights << endl;    cout << "int ";    cout << "value = " << *pt << ": location = " << pt << endl;    double * pd = new double;    *pd = 10000001.0;    cout << "double ";    cout << "value = " << *pd << ": location = " << pd << endl;    cout << "location of pointer pd: " << &pd << endl;    cout << "size of pt = " << sizeof(pt);    cout << "size of *pt = " << sizeof(*pt) << endl;    cout << "size of pd = " << sizeof(pd);     cout << "size of *pd = " << sizeof(*pd) << endl;    return 0;}
   

4.18   arraynew.cpp  用new创建动态数组

//arraynew.cpp -- using the new operator for arrays#include "stdafx.h"#include 
   
    int main(){    using namespace std;    double *p3 = new double[3];    p3[0] = 0.2;    p3[1] = 0.5;    p3[2] = 0.8;    cout << "p3[1] is " << p3[1] << ".\n";    p3 = p3 + 1;    cout << "Now p3[0] is " << p3[0] << " and ";    cout << "p3[1] is " << p3[1] << ".\n";    p3 = p3 - 1;    delete[] p3;    return 0;}
   

4.19  addpntrs.cpp   指针算数

//addpntrs.cppp -- pointer addition#include "stdafx.h"#include 
   
    int main(){    using namespace std;    double wages[3] = { 10000.0, 20000.0, 30000.0 };    short stacks[3] = { 3,2,1 };    //Here are two ways to get the address of an array    double * pw = wages; //name of an array = address    short * ps = &stacks[0];//or use address operator    //with array element    cout << "pw = " << pw << ", *pw = " << *pw << endl;    pw = pw + 1;    cout << "add 1 to the pw pointer : \n";    cout << "pw = " << pw << ", *pw = " << *pw << "\n\n";    cout << "ps = " << ps << ", *ps = " << *ps << endl;    ps = ps + 1;    cout << "add 1 to the ps pointer:\n";    cout << "ps = " << ps << ", *ps = " << *ps << "\n\n";    cout << "access two element with array notation\n";    cout << "stacks[0] = " << stacks[0] << "stack[1] = " << stacks[1] << endl;    cout << "access two element with pointer notation\n";    cout << "*stacks = " << *stacks << ", *{stacks + 1} = " << *(stacks + 1) << endl;    cout << sizeof(wages) << " = size of wages array\n";    cout << sizeof(pw) << " size of pw pointer\n";    return 0;}
   

4.20   ptrstr.cpp   使用不同形式的字符串

//ptrstr.cpp -- using pointers to strings#include "stdafx.h"#include 
   
    #include 
    
                         //declare strlen(),strcpy()int main(){    using namespace std;    char animal[20] = "bear";         //animal holds bear    const char * bird = "wren";       //bird holds address of string    char * ps;                        //uninitialized    cout << animal << " and ";        //display bear    cout << bird << "\n";             //display wren    // cout << ps << "\n";//may display garbage, may cause a crash    cout << "Enter a kind of animal: ";    cin >> animal;                    //ok if input < chars    // cin >> ps ;Too horrible a blunder to try; ps doesn't point to allocated space    ps = animal;                      //set ps to point to string    cout << ps << "!\n";              //ok, same as using animal    cout << "Before using strcpy():\n";    cout << animal << " at " << (int *)animal << endl;    cout << ps << " at " << (int *)ps << endl;    ps = new char[strlen(animal) + 1];//get new storage    strcpy(ps, animal);               //copy string to new storage    cout << "After using strcpy():\n";    cout << animal << " at " << (int *)animal << endl;    cout << ps << " at " << (int *)ps << endl;    delete[] ps;    return 0;}
    
   

4.21  newstrct.cpp  访问指针成员

//newstrct.cpp -- using new with a structure#include "stdafx.h"#include 
   
    struct inflatable // structure definition{    char name[20];    float volume;    double price;};int main(){    using namespace std;    inflatable * ps = new inflatable; // allot memory for structure    cout << "Enter name of inflatable item: ";    cin.get(ps->name, 20); // method 1 for member access    cout << "Enter volume in cubic feet: ";    cin >> (*ps).volume;//method 2 for member access    cout << "Enter price : $";    cin >> ps->price;    cout << "Name: " << (*ps).name << endl; //method 2    cout << "Volume: " << ps->volume << " cubic feet\n";//method 1    cout << "Price: $" << ps->price << endl; //method 1    delete ps; //free memory used by structure    return 0;}
   

4.22   delete.cpp   演示delete

//delete.cpp -- using the delete operator#include "stdafx.h"#include 
   
    #include 
    
     //or string.husing namespace std;char * getname(void);//function prototypeint main(){    char *name;//create pointer but no storage    name = getname();//assign address of string to name    cout << name << " at " << (int *)name << "\n";    delete[] name; // memory freed    name = getname(); //reuse freed mamory    cout << name << " at " << (int *)name << "\n";    delete[] name; // memory freed again    return 0;}char * getname() // return pointer  to new string{    char temp[80]; //temporay storage    cout << "Enter last name: ";    cin >> temp;    char * pn = new char[strlen(temp) + 1];    strcpy(pn, temp); //copy string into smaller space    return pn; //temp lost when function ends}
    
   

4.23  mixtypes.cpp  类型组合

//mixtype.cpp -- some type combinations#include "stdafx.h"#include 
   
    struct antarctica_years_end{    int year;    /*some relly interesting data,etc.*/};int main(){    antarctica_years_end s01, s02, s03;    s01.year = 1998;    antarctica_years_end *pa = &s02;    pa->year = 1999;    antarctica_years_end trio[3];//array of structures    trio[0].year = 2003;    std :: cout << trio->year << std::endl;    const antarctica_years_end * arp[3] = { &s01,&s02,&s03 };    std::cout << arp[1]->year << std::endl;    const antarctica_years_end **ppa = arp;    auto ppb = arp;//C++11 automatic type deduction or else use const antarctica_years_end         **ppb = arp;    std::cout << (*ppa)->year << std::endl;    std::cout << (*(ppb + 1))->year << std::endl;    return 0;}
   

4.24   choices.cpp  vector对象  

 //choices.cpp -- array variations#include "stdafx.h"#include 
   
    #include 
    
      //STL C++98#include 
     
      //C+11int main(){    using namespace std;    //C,original C++    double a1[4] = { 1.2,2.4,3.6,4.8 };    //C++98 STL    vector
      
        a2(4);//create vector with 4 element    //no simple way to initialize in C98    a2[0] = 1.0 / 3.0;    a2[1] = 1.0 / 5.0;    a2[2] = 1.0 / 7.0;    a2[3] = 1.0 / 9.0;    //C++ -- create and initialize array object    array
       
         a3 = { 3.14,2.72,1.62,1.41 };    array
        
          a4; a4 = a3;//valid for array object of same size //use array notation cout << "a1[2]: " << a1[2] << " at " << &a1[2] << endl; cout << "a2[2]: " << a2[2] << " at " << &a2[2] << endl; cout << "a3[2]: " << a3[2] << " at " << &a3[2] << endl; cout << "a4[2]: " << a4[2] << " at " << &a4[2] << endl; //misdeed a1[-2] = 20.2; cout << "a1[-2]: " << a1[-2] << " at " << &a1[-2] << endl; cout << "a3[2]: " << a3[2] << " at " << &a3[2] << endl; cout << "a4[2]: " << a4[2] << " at " << &a4[2] << endl; return 0;}
        
       
      
     
    
   

课后编程习题答案

//problem.cpp -- homework#include "stdafx.h"#include 
   
    #include 
    
     #include 
     
      using namespace std;//problem_1struct student{	char fn[20];	char ln[20];	char grade;	int age;};void display(student);int main(){	cout << "what is your first name?" << endl;	student bs;	cin.getline(bs.fn, asize);	cout << "what is your last name?" << endl;	cin.getline(bs.ln, asize);	cout << "what letter grade do you deserve?" << endl;	cin >> bs.grade;	cout << "what is your age?" << endl;	cin >> bs.age;	display(bs);	return 0;}void display(student name){	cout << "Name: " << name.fn << "," << name.ln << endl;	cout << "Grade: " << char(name.grade + 1) << endl;	cout << "Age: " << name.age << endl;}//problem2int main(){	string name, dessert;	cout << "Enter your name: \n";	getline(cin, name);	cout << "Enter your favorite dessert: \n";	getline(cin, dessert);	cout << "I have some delicious " << dessert;	cout << " for you, " << name << ".\n";	return 0;}//problem3int main(){	char fname[20];	char lname[20];	char fullname[2 * 20 + 1];	cout << "Enter your first name:";//输入名字，存储在fname[]数组中	cin.getline(fname, 20);	cout << "Enter your last name:";//输入姓，存储在lname[]数组中	cin.getline(lname, 20);	strncpy(fullname, lname, 20);//把姓lname 复制到fullname 空数组中	strcat(fullname, ", ");//把“， ”附加到上述fullname 尾部	strncat(fullname, fname, 20);//把fname 名字附加到上述fullname 尾部	fullname[2 * 20] = '\0';//为防止字符型数组溢出，在数组结尾添加结束符	cout << "Here's the information in a single string:" << fullname << endl;//显示组合结果	return 0;}//problem4int main(){	string fname, lname, attach, fullname;	cout << "Enter your first name:";	getline(cin, fname);//note:将一行输入读取到string 类对象中使用的是getline(cin,str),它没有使用句点表示法，所以不是类方法	cout << "Enter your last name:";	getline(cin, lname);	attach = ", ";	fullname = lname + attach + fname;	cout << "Here's the information in a single string:" << fullname << endl;	return 0;}//problem5struct CandyBar{	char brand[20];	double weight;	int calory;};int main(){	CandyBar snack = { "Mocha Munch",2.3,350 };	cout << "Here's the information of snack:\n";	cout << "brand:" << snack.brand << endl;	cout << "weight:" << snack.weight << endl;	cout << "calory:" << snack.calory << endl;	return 0;}//problem6struct CandyBar{	char brand[20];	double weight;	int calory;};int main(){	using namespace std;	CandyBar snack[3] = {	{ "Mocha Munch",2.3,350 },	{ "XuFuJi",1.1,300 },	{ "Alps",0.4,100 }	};	for (int i = 0; i < 3; i++)//利用for 循环来显示snack 变量的内容	{		cout << snack[i].brand << endl			<< snack[i].weight << endl			<< snack[i].calory << endl << endl;	}	return 0;}//problem7struct pizza{	char company[20];	double diameter;	double weight;};int main(){	using namespace std;	pizza pie;//创建一个名为pie 的结构变量	cout << "What's the name of pizza company:";	cin.getline(pie.company, 20);	cout << "What's the diameter of pizza:";	cin >> pie.diameter;	cout << "What's the weight of pizza:";	cin >> pie.weight;	cout << "company:" << pie.company << endl;	cout << "diameter:" << pie.diameter << " cm" << endl;	cout << "weight:" << pie.weight << " g" << endl;	return 0;}//problem8struct pizza//声明结构{	char company[20];	double diameter;	double weight;};int main(){	using namespace std;	pizza *pie = new pizza;//使用new 创建动态结构	cout << "What's the diameter of pizza:";	cin >> pie->diameter;	cin.get();//读取下一个字符	cout << "What's the name of pizza company:";	cin.get(pie->company, 20);	cout << "What's the weight of pizza:";	cin >> pie->weight;	cout << "company:" << pie->company << endl;	cout << "diameter:" << pie->diameter << " cm" << endl;	cout << "weight:" << pie->weight << " g" << endl;	delete pie;//delete 释放内存	return 0;}//problem9struct CandyBar{	string brand;	double weight;	int calory;};int main(){	CandyBar *snack = new CandyBar[3];	snack[0].brand = "A";//单个初始化由new 动态分配的内存	snack[0].weight = 1.1;	snack[0].calory = 200;	snack[1].brand = "B";	snack[1].weight = 2.2;	snack[1].calory = 400;	snack[2].brand = "C";	snack[2].weight = 4.4;	snack[2].calory = 500;	for (int i = 0; i < 3; i++)	{		cout << " brand: " << snack[i].brand << endl;		cout << " weight: " << snack[i].weight << endl;		cout << " calorie: " << snack[i].calory << endl << endl;	}	delete[] snack;	return 0;}//problem10int main(){	const int Size = 3;	int success[Size];	cout << "Enter your success of the three times 40 meters running:\n";	cin >> success[0] >> success[1] >> success[2];	cout << "success1:" << success[0] << endl;	cout << "success2:" << success[1] << endl;	cout << "success3:" << success[2] << endl;	double average = (success[0] + success[1] + success[2]) / 3;	cout << "average:" << average << endl;	return 0;}
     
    
   

 

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