运算符
作用:用于执行代码的运算
运算符类型 |
作用
|
算术运算符 |
用于处理四则运算 |
赋值运算符 |
用于将表达式的值赋给变量 |
比较运算符 |
用于表达式的比较,并返回一个真值或假值 |
逻辑运算符 |
用于根据表达式的值返回真值或假值 |
01 算术运算符
运算符 |
术语 |
示例 |
结果 |
+ |
正号 |
+3 |
3 |
- |
负号 |
-3 |
-3 |
+ |
加 |
10+5 |
15 |
- |
减 |
10-5 |
5 |
* |
乘 |
10*5 |
50 |
/ |
除 |
10/5 |
2 |
% |
取模/取余 |
10%3 |
1 |
++ |
前置递增 |
a=2;b=++a; |
a=3;b=3; |
++ |
后置递增 |
a=2;b=a++; |
a=3;b=2; |
-- |
前置递减 |
a=2;b=--a; |
a=1;b=1; |
-- |
后置递增 |
a=2;b=a--; |
a=1;b=2; |
#include<iostream>
using namespace std;
int main1()
{
//加减乘除
int a1 = 10;
int b1 = 3;
cout << a1 + b1 << endl;
cout << a1 - b1 << endl;
cout << a1 * b1 << endl;
cout << a1 / b1 << endl; //两个整数相除,结果依然是整数,将小数部分去除
int a2 = 10;
int b2 = 20;
cout << a2 / b2 << endl;
int a3 = 10;
int b3 = 0;
//cout << a3 / b3 << endl; //错误,除数不可以为0
double x1 = 0.5;
double x2 = 0.22;
cout << x1 / x2 << endl;
//取模
int c1 = 10;
int d1 = 3;
cout << c1 % d1 << endl;
int c2 = 10;
int d2 = 20;
cout << c2 % d2 << endl;
int c3 = 10;
int d3 = 0;
//cout << c3 % d3 << endl; //错误,取模除数不可以为0
double x3 = 3.14;
double x4 = 1.1;
//cout << x3 % x4 << endl; //错误,不支持小数取模运算
//1.前置递增
int m = 10;
++m;
cout << "m = " << m << endl;
//2.后置递增
int n = 10;
n++;
cout << "n = " << n << endl;
//3.前置和后置的区别
//前置递增:先让变量+1,后进行表达式运算
int m2 = 10;
int n2 = ++m2 * 10;
cout << "m2 = " << m2 << endl;
cout << "n2 = " << n2 << endl;
//后置递增:先进行表达式运算,后让变量+1
int m3 = 10;
int n3 = m3++ * 10;
cout << "m3 = " << m3 << endl;
cout << "n3 = " << n3 << endl;
system("pause");
return 0;
}
02 赋值运算符
运算符 |
术语 |
示例 |
结果 |
= |
赋值 |
a=2;b=3; |
a=2;b=3; |
+= |
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<iostream>
using namespace std;
int main2()
{
//赋值运算符
int a = 10;
cout << "a = " << a << endl; //10
// +=
a += 2;
cout << "a = " << a << endl; //12
// -=
a = 10;
a -= 2;
cout << "a = " << a << endl; //8
// *=
a = 10;
a *= 2;
cout << "a = " << a << endl; //20
// /=
a = 10;
a /= 2;
cout << "a = " << a << endl; //5
// %=
a = 10;
a %= 2;
cout << "a = " << a << endl; //0
system("pause");
return 0;
}
03 比较运算符
运算符术语示例结果==相等于4==30!=不等于4!=31<小于4<30>大于4>31<=小于等于4<=30>=大于等于4>=31
#include<iostream>
using namespace std;
int main3()
{
//比较运算符
// ==
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;
}
04 逻辑运算符
运算符术语示例结果!非!a如果a为假,则!a为真;如果a为真,则!a为假。&&与a&&b如果a和b都为真,则结果为真,否则为假。||或a||b如果a或b有一个为真,则结果为真;二者都为假时,结果为假。
#include<iostream>
using namespace std;
int main4()
{
//逻辑运算符 非 !
int a = 10;
cout << !a << endl; //0
cout << !!a << endl; //1
//逻辑运算符 与 &&
int c = 10;
int d = 10;
cout << (c && d) << endl; // 1
c = 0;
d = 10;
cout << (c && d) << endl; // 0
c = 10;
d = 0;
cout << (c && d) << endl; // 0
c = 0;
d = 0;
cout << (c && d) << endl; // 0
//逻辑运算符 或 ||
int e = 10;
int f = 10;
cout << (e || f) << endl; // 1
e = 0;
f = 10;
cout << (e || f) << endl; // 1
e = 10;
f = 0;
cout << (e || f) << endl; // 1
e = 0;
f = 0;
cout << (e || f) << endl; // 0
system("pause");
return 0;
}
总结
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