求指导,更找不到错误了
#define _CRT_SECURE_NO_WARNINGS 1
#include <stdio.h>
main()
{ float score;
printf("请输入成绩:");
scanf("%.1f", &score);
if (score >= 90 && score <= 100)
printf("等级A\n");
else if (score >= 80 && score < 90)
printf("等级B\n");
else if (score >= 70 && score < 80)
printf("等级C\n");
else if (score >= 60 && score < 70)
printf("等级D\n");
else
printf("成绩不合格\n");
}