just creat a new repository according to the guides #include <stdio.h> int search(int aim,int data[],int size); int main(){ int aim=14; int data[]={5,7,9,11,13,17,24,47,68,72,89,90,112}; printf("%d\n",search(aim,data,13));//希望输出14所对应的索引号 return 0; } int search(int aim,int data[],int size){ //二分法搜索 int det = -1; int left = 0;//定义left整数变量 int right = size-1;//定义right while(left<=right){//在while循环中直到有一个条件结束搜索 int mid = (left+right)/2; if(data[mid]<aim){ left = mid+1; }else if(data[mid]>aim){ right = mid-1; }else{ det = mid; break;//一定要break跳出循环 } } return det; }