C++的运算符你真的了解吗

目录

• 前言
• 1 算术运算符
• 2 赋值运算符
• 3 比较运算符
• 4 逻辑运算符
• 总结

前言

运算符的作用：用于执行代码的运算

主要有：

1 算术运算符

用于处理四则运算

对于前置递增：将递增运算前置，使变量先加一，再进行表达式运算。

对于后置递增：将递增运算后置，使变量先进行表达式运算，再加一。

#include
using namespace std;
int main()
{
	//1.前置递增：先加一，再进行表达式运算
	int a = 10;
	int b = ++a * 10;
	cout << "a = " << a << endl;
	cout << "b = " << b << endl;
	//2.后置递增：先进行表达式运算，再加一
	int c = 10;
	int d = c++ * 10;
	cout << "c = " << c << endl;
	cout << "d = " << d << endl;
	system("pause");
	return 0;
}

2 赋值运算符

#include
using namespace std;
int main1()
{
	//赋值运算符
	int a = 10;
	int b = 2;
	cout << "a = " << a << endl;
	//+=
	a = 10;
	a += b;
	cout << "a = " << a << endl;
	//-=
	a = 10;
	a -= b;
	cout << "a = " << a << endl;
	//*=
	a = 10;
	a *= b;
	cout << "a = " << a << endl;
	// /=
	a = 10;
	a /= b;
	cout << "a = " << a << endl;
	// %=
	a = 10;
	a %= b;
	cout << "a = " << a << endl;
	system("pause");
	return 0;
}

3 比较运算符

#include
using namespace std;
int main()
{
	cout << (4 == 3) << endl;
	cout << (4 != 3) << endl;
	cout << (4 < 3) << endl;
	cout << (4 > 3) << endl;
	cout << (4 >= 3) << endl;
	cout << (4 <= 3) << endl;
	system("pause");
	return 0;
}

4 逻辑运算符

#includeusing namespace std;int main(){int a = 5;// 逻辑运算符 非cout << !a << endl;cout << !!a << endl;// 逻辑运算符 与int b = 0;int c = 3;cout << (a && b) << endl;cout << (a && c) << endl;//逻辑运算符  或cout << (!a || b) << endl;cout << (a || c) << endl;system("pause");return 0;}#include
using namespace std;
int main()
{
	int a = 5;
	// 逻辑运算符 非
	cout << !a << endl;
	cout << !!a << endl;
	// 逻辑运算符 与
	int b = 0;
	int c = 3;
	cout << (a && b) << endl;
	cout << (a && c) << endl;
	//逻辑运算符  或
	cout << (!a || b) << endl;
	cout << (a || c) << endl;
	system("pause");
	return 0;
}

总结

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