c語言mid

❶ C語言程序編寫——折半查找法

#include<stdio.h>
intmain()
{inta[16]={15,14,13,12,11,10,9,8,7,6,5,4,3,1,0};
intl=0,r=15,mid,x;
scanf("%d",&x);
do
{mid=(l+r)/2;
if(a[mid]==x)break;
if(x>a[mid])r=mid-1;
elsel=mid+1;
}while(l<=r);
if(a[mid]==x)
printf("a[%d]=%d
",mid,x);
else
printf("無此數
");
return0;
}