c++ - 更高效地编写 if 语句

Question

#include <iostream>
using namespace std;


int Age ;


int main(){
    cout << "How old are you? ";
    cin >> Age;


    if (Age < 1)
    { 

    cout << "I dont believe you!";
    }

if (Age == 20)
{
    cout << "We're almost the same age!" << endl;
}
if (Age == 21)
{
    cout << "We're almost the same age!" << endl;
}
if (Age == 22)
{
    cout << "We're almost the same age!" << endl;
}
if (Age == 23)
{
    cout << "We're almost the same age!" << endl;
}
if (Age == 24)
{
    cout << "We're almost the same age!" << endl;
}
if (Age == 25)
{
    cout << "We're almost the same age!" << endl;
}

if ( Age % 2 == 1)
{
cout << "Thats an odd age.";
}
cout << "";
}

有什么方法可以更有效地编写一个程序来检查用户年龄是否在 20-25 岁之间，而不是有这么多 if 语句？

我自己尝试在每个数字的条件之间使用 or ，就像这样

if (Age ==20||21||22||23||24||25)

但是没用

Answer 1

if (Age >= 20 && Age <= 25) {
    // write your code here
}

if 语句中的 bool 表达式意味着，Age 应该大于或等于 20 和 小于或等于到 25。例如，22 大于 20 且小于 25。

我建议您阅读有关 logical operators in C++ 的内容.