運算符
作用：用于執行代碼的運算
| 運算符類型 |
作用 |
| 算術運算符 | 用于處理四則運算 |
| 賦值運算符 | 用于將表達式的值賦給變量 |
| 比較運算符 | 用于表達式的比較，并返回一個真值或假值 |
| 邏輯運算符 | 用于根據表達式的值返回真值或假值 |
01 算術運算符
| 運算符 | 術語 | 示例 | 結果 |
| + | 正號 | +3 | 3 |
| - | 負號 | -3 | -3 |
| + | 加 | 10+5 | 15 |
| - | 減 | 10-5 | 5 |
| * | 乘 | 10*5 | 50 |
| / | 除 | 10/5 | 2 |
| % | 取模/取余 | 10%3 | 1 |
| ++ | 前置遞增 | a=2;b=++a; | a=3;b=3; |
| ++ | 后置遞增 | a=2;b=a++; | a=3;b=2; |
| -- | 前置遞減 | a=2;b=--a; | a=1;b=1; |
| -- | 后置遞增 | a=2;b=a--; | a=1;b=2; |
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#include<iostream>using namespace std;int main1(){ //加減乘除 int a1 = 10; int b1 = 3; cout << a1 + b1 << endl; cout << a1 - b1 << endl; cout << a1 * b1 << endl; cout << a1 / b1 << endl; //兩個整數相除，結果依然是整數，將小數部分去除 int a2 = 10; int b2 = 20; cout << a2 / b2 << endl; int a3 = 10; int b3 = 0; //cout << a3 / b3 << endl; //錯誤，除數不可以為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; //錯誤，取模除數不可以為0 double x3 = 3.14; double x4 = 1.1; //cout << x3 % x4 << endl; //錯誤，不支持小數取模運算 //1.前置遞增 int m = 10; ++m; cout << "m = " << m << endl; //2.后置遞增 int n = 10; n++; cout << "n = " << n << endl; //3.前置和后置的區別 //前置遞增：先讓變量+1，后進行表達式運算 int m2 = 10; int n2 = ++m2 * 10; cout << "m2 = " << m2 << endl; cout << "n2 = " << n2 << endl; //后置遞增：先進行表達式運算，后讓變量+1 int m3 = 10; int n3 = m3++ * 10; cout << "m3 = " << m3 << endl; cout << "n3 = " << n3 << endl; system("pause"); return 0;} |
02 賦值運算符
| 運算符 | 術語 | 示例 | 結果 |
| = | 賦值 | a=2;b=3; | a=2;b=3; |
| += | 加等于 | a=0;a+=2; | a=2; |
| -= | 減等于 | 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(){ //賦值運算符 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 比較運算符
運算符術語示例結果==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(){ //比較運算符 // == 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 邏輯運算符
運算符術語示例結果!非!a如果a為假，則!a為真；如果a為真，則!a為假。&&與a&&b如果a和b都為真，則結果為真，否則為假。||或a||b如果a或b有一個為真，則結果為真；二者都為假時，結果為假。
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#include<iostream>using namespace std;int main4(){ //邏輯運算符 非 ! int a = 10; cout << !a << endl; //0 cout << !!a << endl; //1 //邏輯運算符 與 && 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 //邏輯運算符 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;} |
總結
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原文鏈接：https://blog.csdn.net/weixin_43943624/article/details/121480974
