binary_search.c

#include <stdio.h>
binarySearch(int a[], int n, int key){
    int low = 0;
    int high = n - 1;
    while(low<= high){
        int mid = (low + high)/2;
        int midVal = a[mid];
        if(midVal<key)
            low = mid + 1;
        else if(midVal>key)
            high = mid - 1;
        else
            return mid;
    }
    return -1;
}
int main(){
    int i, val, ret;
    int a[8]={-32, 12, 16, 24, 36, 45, 59, 98};
    for(i=0; i<8; i++)
        printf("%d\t", a[i]);
    printf("\n请输人所要查找的元素：");
    scanf("%d",&val);
    ret = binarySearch(a,8,val);
    if(-1 == ret)
        printf("查找失败 \n");
    else
        printf ("查找成功 \n");
    return 0;
}