作用：用于表达式的比较，并返回一个真值或者假值

#define _CRT_SECURE_NO_WARNINGS
#include<iostream>
#include<string>
using namespace std;
int main()
{
	//==
	int a = 10;
	int b = 20;	//变量a重新赋值为100

	//==
	cout << (a==b) << endl;

	//!=
	cout << (a != b) << endl;
	//>
	cout << (a > b) << endl;

	//<
	cout << (a < b) << endl;

	//>=
	cout << (a >= b) << endl;

	//<=
	cout << (a <= b) << endl;

	system("pause");

	return 0;
}

运行结果：

0
1
0
1
0
1

注：1表示真，0表示假