本文共 2978 字，大约阅读时间需要 9 分钟。

说明:

1、.bss 不占执行文件的空间，只是记录数据所需空间的大小。bss区域的的数据由OS初始化为0；

2、.data 占可执行文件的空间，其内容由程序初始化。

所以，全局变量是否初始化（初始化为非0值），将影响可执行文件的大小。

// 头文件#include 
   
    #include 
    
     #include 
     
      #define  HEAP_ZONE_DATA  100// 全局变量--全局区int g_var1 = 0x12; //.data区int g_var2 = 0;    //.bss区int g_var3;        //.bss区// 全局静态变量--全局区static int g_static_var4 = 0x34; //.data区static int g_static_var5 = 0;    //.bss区static int g_static_var6;        //.bss区// 全局常量--全局区const int g_const_var7 = 0x56;  //常量区const int g_const_var8 = 0;// const int g_const_var9; //常量必须初始化// 打印全局区数据的地址信息void test1_printGlobalZoneAddr(){// 静态局部变量--全局区      static int static_var10 = 0x78;      static int static_var11 = 0;      static int static_var12 ;	printf("----------------------Begin:Global Zone Addr----------------\n");	printf("addr global var inited nonzero-value \t0x%llx\n", &g_var1);	printf("addr global var inited zero-value \t0x%llx\n", &g_var2);	printf("addr global var none inited \t\t0x%llx\n", &g_var3);	printf("addr global static var inited nonzero-value \t0x%llx\n", &g_static_var4);	printf("addr global static var inited zero-value \t0x%llx\n", &g_static_var5);	printf("addr global static var none inited \t\t0x%llx\n", &g_static_var6);	printf("addr global const var inited nonzero-value \t0x%llx\n", &g_const_var7);	printf("addr global const var inited zero-value \t0x%llx\n", &g_const_var8);	// printf("addr global const var none inited 0x%llx\n", &g_const_var9);	printf("addr local static var inited nonzero-value \t0x%llx\n", &static_var10);	printf("addr local static var inited zero-value \t0x%llx\n", &static_var11);	printf("addr local static var none inited \t\t0x%llx\n", &static_var12);	printf("----------------------End:Global Zone Addr----------------\n\n");}// 打印栈区数据的地址信息void test2_printStackZoneAddr(){    // 局部变量--栈区	int i_var13 = 0x9a;	int i_var14 = 0;	int i_var15 = 0;	// const修饰局部变量-- 栈区      const int i_const_var16 = 0x9a;	 const int i_const_var17 = 0;	// const int i_const_var18; //常量必须初始化	printf("----------------------Begin:Stack Zone Addr----------------\n");	printf("addr local var inited nonzero-value \t0x%llx\n", &i_var13);	printf("addr local var inited zero-value \t0x%llx\n", &i_var14);	printf("addr local var none inited \t0x%llx\n", &i_var15);	printf("addr const local var inited nonzero-value \t0x%llx\n", &i_const_var16);	printf("addr const local var inited zero-value \t0x%llx\n", &i_const_var17);	// printf("addr const local var none inited \t0x%llx\n", &i_const_var18);	printf("----------------------End:Stack Zone Addr----------------\n\n");}// 打印堆区数据的地址信息void test3_printHeapZoneAddr(){    char *p1 = (char *)malloc(HEAP_ZONE_DATA);	printf("----------------------Begin:Heap Zone Addr----------------\n");	printf("Heap addr \t\t0x%llx\n", p1);	printf("----------------------End:Heap Zone Addr----------------\n\n");	free(p1);	p1 = NULL;}int main (){    test1_printGlobalZoneAddr();	test2_printStackZoneAddr();	test3_printHeapZoneAddr();	system("pause");	return 0;}