#include "stdio.h"
void main()
{
    int a[11]={5,13,19,21,37,56,64,75,80,88,92},x,low,high,mid,t=0; /*t是标志*/
    printf("input search x: ");
    scanf("%d",&x);
    low=0;
    high=10;
    while(t==0&&low<=high)
    {
        mid=(low+high)/2;
        if(x==a[mid])
        {
            t=1;
            break;
        }
        else if(x<a[mid])
           high=mid-1;
        else
           low=mid+1;
    }
    if(t)
       printf("%d\n",mid);
    else
       printf(" no data!\n");
}
      哪位帮解答下红字里t的作用是什么，谢谢。