#include"stdio.h"
#define NOT_FOUND -1
int found(const int arr[],int target,int n);
int
main(void)
{
    int x[5]={2,6,9,7,100};
    int goal=7;
    int size=5;
    int result;
    result=found(x,7,5);
    printf("结果是%d\n",result);
    return 0;
   
 }
int
found(const int arr[],int target,int n)
{
    int i;
    int found;
    found=0;
    int where;
    i=0;
    while (!found&&i<n)
       {
             if (arr[i]==target)
                   {
                        found=1;
                }
                else
                  {
                      found=0;
                  }
       }
    if (found)
      {
           where=i;
      }else
       {
           where=NOT_FOUND;
       }
       return (where);
}

found函数里的while是个死循环

2楼正解
while循环中应该有++i;这句代码，实现数组遍历。
以下是我写的代码，我是新手，勿喷。

while (i<n)
     {
         if(arr[i] == target)
         {
        found = 1;
              break;
         }
         ++i;
    } 

好了，谢了