C运算符 对比a++、++a、b--、 --b

#include<stdio.h> 
int main()  
{  
    int a = 21;
    int b = 10;
    int c, d;
    c = a++;//先赋值给c,a本身再运算   c = 21, a = 22;
    //c = ++a;//a本身先运算，再赋值给c    a = 22,c = 22;
    printf("c = %d, a = %d\n",c, a);  
    d = --b;//b本身先运算，再赋值给d    b = 9,d = 9;
    //d = b--;//先赋值给d,b本身再运算   d = 10, b = 9;
    printf("d = %d, b = %d\n",d, b);
    return 0;  
}

参考网址：https://www.runoob.com/cprogramming/c-operators.html

逻辑运算符：与 或 非 && || !

位运算符：对每一位执行逻辑与&   或 |    异或 ^ 取反~    左移<<   右移>>

#include <stdio.h>
 
int main()
{
 
   unsigned int a = 60;    /* 60 = 0011 1100 */  
   unsigned int b = 13;    /* 13 = 0000 1101 */
   int c = 0;           
 
   c = a & b;       /* 12 = 0000 1100 */ 
   printf("Line 1 - c 的值是 %d\n", c );
 
   c = a | b;       /* 61 = 0011 1101 */
   printf("Line 2 - c 的值是 %d\n", c );
 
   c = a ^ b;       /* 49 = 0011 0001 */
   printf("Line 3 - c 的值是 %d\n", c );
 
   c = ~a;          /*-61 = 1100 0011 */
   printf("Line 4 - c 的值是 %d\n", c );
 
   c = a << 2;     /* 240 = 1111 0000 */
   printf("Line 5 - c 的值是 %d\n", c );
 
   c = a >> 2;     /* 15 = 0000 1111 */
   printf("Line 6 - c 的值是 %d\n", c );
}

按位与且赋值运算符&=，按位异或且赋值运算符^=，按位或且赋值运算符|=