#include <stdio.h>
#include <stdlib.h>
#include <windows.h>
main()
{
float num;
char grade;
scanf("%d",&num);
if(num>=90) grade='A';
else if(num>=80&&num<89) grade='B';
else if(num>=70&&num<79) grade='C';
else if(num>=60&&num<69) grade='D';
else grade='E';
printf("%c",grade);
Sleep(10000);
return(0);
}
编译后 输入任何成绩都显示E,为毛这样。。。求解
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