c语言 BREAK语句

楼主的题目好像没表达清楚吧？

#include<stdio.h>
int main()
{
int a=0,b=0,i,t;
for(i=0;i<10;i++)
{
scanf("%d",&t);
if(t<60)
b++;
else
a++;
}
printf("a=%d\n",a);
printf("b=%d\n",b);
return 0;
}

#include<stdio.h>
void main()
{
int n = 10;
float grade;
int M=0,N=0; //M为及格数，N为不及格数
printf("\nplease input the grade:\n");
while(n--)
{
scanf("%f",&grade);
switch(int(grade/10.0))
{
case 10:
case 9:
case 8:
case 7:
case 6: M++; break;
default: N++; break;
}
}
printf("the number passed a=%d",M);
printf("\nthe number not passed b=:%d\n",N);
}

#include<stdio.h>
void mian()
{ int a,b,i,temp = 0;
a = temp;
for(i=0;i<11;i++)