c语言题目：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,80~89分为B，

c语言题目：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,80~89分为B，

#include
int main()
{ float score;
char grade;
printf("请输入学生成绩:");
scanf("%f",&score);
while(score>100||score<0)
{printf("\n输入有误,请重新输入");
scanf("%f",&score);
}
switch((int)(score/10))
{
case 10:
case 9:grade='A';break;
case 8:grade='B';break;
case 7:grade='C';break;
case 6:grade='D';break;
case 5:
case 4:
case 3:
case 2:
case 1:
case 0:grade='E';
}
printf("成绩是 %5.1f,相应的等级是%c\n",score,grade);
return 0;
}

#include
main()
{
int grade;
scanf("%d",&grade);
if(grade>=90)
cout<<'A';
else if(grade>=80 && grade<=89)
cout<<'B';
else if(grade>=70 && grade<=79)
cout<<'C';
else if(grade>=60 && grade<=69)
cout<<'D';
else if(grade<=59)
cout<<'E';
else
cout<<"error";
}

这要是都不会写干脆就别学计算机语言了
一直if判断就行

#include
main()
{
int iNum;
sacnf("%d", &iNum);
switch (iNum / 10)
{
case 10:
case 9 : printf("A\n");break;
case 8 : printf("B\n");break;
case 7 : printf("C\n");break;
case 6 : printf("D\n");break;
default: printf("E\n");break;
}
}
看的明白吧？？？

switch()语句就可以阿

#include
main()
{
int num;
printf("qing shu ru yi ge cheng ji:");
scanf("%d", &num);
if(num>=0&&num<=100) {
switch (num/10)
{
case 10:
case 9 : printf("A\n");break;
case 8 : printf("B\n");break;
case 7 : printf("C\n");break;
case 6 : printf("D\n");break;
default: printf("E\n");break;
}}
else
printf("qing shu ru zheng que de fen shu:");
getch();
}