C语言if选择练习题

• C语言实现输出对应成绩的等级

# include <stdio.h>

int main()
{
   
	float grade;

	scanf("%f", &grade);

	if (grade > 100)
		printf("Illegal input!\n");
	else if (grade >= 90 && grade <= 100)
		printf("A\n");
	else if (grade >= 80 && grade < 90)
		printf("B\n");
	else if (grade >= 70 && grade < 80)
		printf("C\n");
	else if (grade >= 60 && grade < 70)
		printf(