2020.3.4 fflush（stdin）或者getchar吃掉垃圾字符

# include <stdlib.h> 
int main(void) 
{ 
     int a, c;  char b;  
     printf("input a");  scanf("%d", &a); 
  
     fflush(stdin);//将前一个scanf输入的缓冲区全部清空 
     scanf("%c%d", &b, &c);    
            
     printf("a = %d, b = %c, c = %d\n", a, b, c); 
     system("pause"); 
  
     return 0; 
} 

 1 #include <stdio.h> 
 2 #include <stdlib.h> 
 3 int main(void) 
 4 { 
 5     int a, c;
 6     char b; 
 7     printf("input a: ");  
 8     scanf("%d", &a); //将前一个scanf输入的缓冲区通过循环全部清空 
 9     while (getchar() != ‘\n‘)//表示只要字符不是回车就继续吃缓冲区字符 
10     {
11         ;//空语句 
12     }
13     printf("\ninput b,c\n"); 
14     scanf("%c,%d", &b, &c);
15 
16     printf("a = %d, b = %c, c = %d\n", a, b, c);  system("pause"); 
17 }