1987 C语言yyds good

解题思路:

注意事项:

参考代码:

#include <stdio.h>

int main ()

{

int x;char c1,c2,c3,c4;

c1='A',c2='B',c3='C',c4='D';

scanf("%d",&x);

if (x>=80)

{printf ("A");

}else if (x>=60)

{printf ("B");

}else if (x>=40)

{printf ("C");

}else  printf ("D");

return 0;

}