#include "pch.h"
#include "stdio.h"
#include "math.h"
int main()
{
float s;
int rank;
printf("请输入一个百分制成绩:");
scanf("%f",&s);
if (s >= 90 && s <= 100)
rank = 1;
else if (s >= 80 && s < 90)
rank = 2;
else if (s >= 70 && s < 80)
rank = 3;
else if (s >= 60 && s < 70)
rank = 4;
else
rank = 5;
switch (rank)
{
case 1:printf("成绩等级为:A\n"); break;
case 2:printf("成绩等级为:B\n"); break;
case 3:printf("成绩等级为:C\n"); break;
case 4:printf("成绩等级为:D\n"); break;
case 5:printf("成绩等级为:E\n"); break;
}
return 0;
}