技術標籤：C++ Primer PlusNOT邏輯操作符邏輯表示式C++C++ Primer Plus

程式清單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;
}

待解決問題：

1. 輸入12.3，輸出12？