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程序清单6.7 not.cpp

#include <iostream>#include <climits>bool is_int(double);int main(){       using namespace std;    double num;    cout << "Yo, dude! Enter an integer value:";    cin >> num;    while (!is_int(num))    {           cout << "Out of range -- please try again:";        cin >> num;    }    int val = int(num);    cout << "You've entered the integer " << val << "\nBye\n";    return 0;}bool is_int(double x){       if (x <= INT_MAX && x >= INT_MIN)        return true;    else        return false;}

待解决问题：

1. 输入12.3，输出12？