下面这个IF语句转成switch语句要怎么写：
#include "stdio.h"
main()
{int score=85;
char grade;
grade=stog(score);
printf("score %d is grade %c\n",score,grade);
}
stog(s)
int s;
{if(s>94)return('A');
else if(s>84)return('B');
else if(s>69)return('C');
else if(s>59)return('D');
else return('F');
}

#include "stdio.h"
main()
{int score=85;
char grade;
grade=stog(score);
printf("score %d is grade %c\n",score,grade);
}
stog(s)
int s
switch(s)
{
case (s>94):return('A');break;
case (s>84):return('B');break;
case (s>69):return('C');break;
case (s>59):return('D');break;
default
return('f');
}
这是我写的但是错误.不知道哪里不对。

#include<stdio.h>
void main()
{
int score=85;
char grade;
grade=stog(score);
printf("score %d is grade %c\n",score,grade);
}
stog(s)
int s;
{s=(s+5)/10;
switch(s)
{case 10:return('A');break;
case 9:return('B');break;
case 8:return('C');break;
s=s/10;
case 7:return('C');break;
case 6:return('D');break;
default: return('F');
}
}
删删减减的减去了些。谢谢各位，明白了些。虽然还不是全懂