小编Chr*_*aff的帖子

前两个语句以给定的数字输入运行,但第三个语句不运行.

#include <iostream>
using namespace std;

int main()
{

    double X;

    cout << "Please pick a number from -10 to 10";

    cin >> X;

    if ((-3 <= X)&&( X <= 2))
        cout << "Y = " << ( X * X) + (2 * X) -3 << endl;

    else if ((2 < X)&&(X <= 10))
        cout << "Y = " << (5 * X) + 7 << endl;

    else if ((X > 10)&&(X < -3))
        cout << "Y = " …