手把手带你学习C++的运算符

时间:2021-11-03 12:39:10

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
+ 10+5 15
- 10-5 5
* 10*5 50
/ 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;
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#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;
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#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

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#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。

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#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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原文链接:https://blog.csdn.net/weixin_43943624/article/details/121480974