赋值运算符
**作用：**用于将表达式的值赋给变量
赋值运算符包括以下几个符号：
1 int main() {
2
3 //赋值运算符
4
5 // =
6 int a = 10;
7 a = 100;
8 cout << "a = " << a << endl;
9
10 // +=
11 a = 10;
12 a += 2; // a = a + 2;
13 cout << "a = " << a << endl;
14
15 // -=
16 a = 10;
17 a -= 2; // a = a - 2
18 cout << "a = " << a << endl;
19
20 // *=
21 a = 10;
22 a *= 2; // a = a * 2
23 cout << "a = " << a << endl;
24
25 // /=
26 a = 10;
27 a /= 2; // a = a / 2;
28 cout << "a = " << a << endl;
29
30 // %=
31 a = 10;
32 a %= 2; // a = a % 2;
33 cout << "a = " << a << endl;
34
35 system("pause");
36
37 return 0;
38 }
比较运算符
**作用：**用于表达式的比较，并返回一个真值或假值
比较运算符有以下符号：
1 int main() {
2
3 int a = 10;
4 int b = 20;
5
6 cout << (a == b) << endl; // 0
7
8 cout << (a != b) << endl; // 1
9
10 cout << (a > b) << endl; // 0
11
12 cout << (a < b) << endl; // 1
13
14 cout << (a >= b) << endl; // 0
15
16 cout << (a <= b) << endl; // 1
17
18 system("pause");
19
20 return 0;
21 }
逻辑运算符
**作用：**用于根据表达式的值返回真值或假值
逻辑运算符有以下符号：
1 //逻辑运算符 --- 非
2 int main() {
3
4 int a = 10;
5
6 cout << !a << endl; // 0
7
8 cout << !!a << endl; // 1
9
10 system("pause");
11
12 return 0;
13 }
1 //逻辑运算符 --- 与
2 int main() {
3
4 int a = 10;
5 int b = 10;
6
7 cout << (a && b) << endl;// 1
8
9 a = 10;
10 b = 0;
11
12 cout << (a && b) << endl;// 0
13
14 a = 0;
15 b = 0;
16
17 cout << (a && b) << endl;// 0
18
19 system("pause");
20
21 return 0;
22 }
1 //逻辑运算符 --- 或
2 int main() {
3
4 int a = 10;
5 int b = 10;
6
7 cout << (a || b) << endl;// 1
8
9 a = 10;
10 b = 0;
11
12 cout << (a || b) << endl;// 1
13
14 a = 0;
15 b = 0;
16
17 cout << (a || b) << endl;// 0
18
19 system("pause");
20
21 return 0;
22 }