++ -- 的执行优先级

#include <stdio.h> 
#include <string.h>
#include <stdlib.h>

int main(int argc,const char *argv[])
{
	  int a = 10;
	  int b = 0;
	  b = a++;      //先赋值再加一 ，等价于 b=a，a=a+1; 
	  printf("a = %d\tb = %d\n",a,b);  	   
	  b = a + 1;
	  printf("a = %d\tb = %d\n",a,b);
	  puts("--------------------------------");
	  b = ++a;   //等价于 a=12 b=12   a先加一，再赋值于b 
	  printf("a = %d\tb = %d\n",a,b);
	  puts("--------------------------------");
	  printf("a = %d\tb = %d\n",a++,b++);   //先显示再自加一 
	  printf("a = %d\tb = %d\n",a,b);
	  puts("--------------------------------");
	  printf("a = %d\tb = %d\n",++a,++b);   //先自加一再显示 
	  printf("a = %d\tb = %d\n",a,b);
	  return 0;	
}