【C语言】给出一百分制成绩 要求输出成绩等级

题目：给出一百分制成绩，要求输出成绩等级‘A’，‘B’，‘C’，‘D’，‘E’。90分以上为A’，8089分为‘B’，7079分为‘C’，60~69分为‘D’，60分以下为‘E’。

#define _CRT_SECURE_NO_WARNINGS#include <stdio.h>#include<math.h>int main(){float s;int rank;printf("请输入成绩：");scanf("%f", &s);if (s >= 0 && s <= 100){if (s >= 90 && s <= 100)rank = 1;else if (s >= 80 && s <= 89)rank = 2;else if (s >= 70 && s <= 79)rank = 3;else if (s >= 60 && s <= 69)rank = 4;elserank = 5;}elseprintf("输入值错误\n");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;default:printf("输入值错误\n");}system("pause");return 0;}