#include<stdio.h>
main()
{
int s;
printf("请输入百分制成绩s:\n");
scanf("%d",&s);
if (s>=90)
printf("A\n");
else if(90>s&&s>=80)
printf("B\n");
else if(80>s&&s>=70)
printf("C\n");
else if(70>s&&s>=60)
printf("D\n");
else if(60>s)
printf("E\n");
}
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