C++运算符

目录

1 算术运算符

2 赋值运算符

3 比较运算符

4 逻辑运算符

作用：用于执行代码的运算

1 算术运算符

作用：用于处理四则运算

加减乘除：

#include
using namespace std;

int main() {

	//加减乘除
	int a1 = 56;
	int b1 = 32;

	cout << a1 + b1 << endl;
	cout << a1 - b1 << endl;
	cout << a1 * b1 << endl;
	cout << a1 / b1 << endl;//两整数做相除的运算，结果仍为整数

	int a2 = 10;
	int b2 = 20;

	cout << a2 / b2 << endl;

	int a3 = 10;
	int b3 = 0;

	//cout << a3 / b3 << endl;//除数不能为0

	//小数相除
	double d1 = 0.26;
	double d2 = 0.265;
	cout << d1 / d2 << endl;//运算结果是double类型

	system("pause");
	
	return 0;
}

取模：

#include
using namespace std;

int main() {

	//取模，本质就是求余数
	int a1 = 20;
	int b1 = 6;

	cout << a1 % b1 << endl;

	int a2 = 10;
	int b2 = 20;

	cout << a2 % b2 << endl;

	int a3 = 10;
	int b3 = 0;

	//cout << a3 % b3 << endl;//除数不能为0

	//小数不能做取模运算

	system("pause");

	return 0;
}

递增递减：

#include
using namespace std;

int main() {

	//前置递增
	int a = 10;
	++a;//变量+1
	cout << "a = " << a << endl;

	//后置递增
	int b = 10;
	b++;//变量+1
	cout << "b = " << b << endl;

	//前置和后置的区别
	//前置递增 先让变量+1 然后进行表达式运算
	int a2 = 10;
	int b2 = ++a2 * 10;
	cout << "a2 = " << a2 << endl;
	cout << "b2 = " << b2 << endl;

	//后置递增 先进行表达式的运算，后让变量+1
	int a3 = 10;
	int b3 = a3++ * 10;
	cout << "a3 = " << a3 << endl;
	cout << "b3 = " << b3 << endl;

	system("pause");

	return 0;
}

2 赋值运算符

作用：用于将表达式的值赋给变量

运算符	术语	示例	结果
=	赋值	a=2	a=2
+=	加等于	a=0;a+=2;	a=2
-=	减等于	a=5;a-=3	a=2
*=	乘等于	a=2;a*=2	a=4
/=	除等于	a=4;a/=2	a=2
%=	模等于	a=3;a%=2	a=1

#include
using namespace std;



int main() {

	//=
	int a = 10;
	a = 100;
	cout << "a = " << a << endl;

	//+=
	int b = 10;
	b += 2;
	cout << "b = " << b << endl;

	//-=
	int c = 10;
	c -= 2;
	cout << "c = " << c << endl;

	/

int main() {

	//==
	int a = 10;
	int b = 20;
	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;
}

4 逻辑运算符

作用：用于根据表达式的值返回真值或假值

运算符	术语	示例	结果
！	非	a=0;a=！a	a=1
&&	与	a=0;b=1;c=a&&b	c=0
||	或	a=0;b=1;c=a||b	c=1

#include
using namespace std;



int main() {
    
	int a = 1;
	int b = 0;
	//! 非
	cout << !a << endl;
	cout << !!a << endl;

	//&&与
	cout << (a&&b) << endl;

	//||或
	cout << (a||b) << endl;

	system("pause");

	return 0;
}