[]アレイ動作 - 検索

#include<stdio.h>
int search(int key,int a[],int len)
{
    int ret=-1;
    for(int i=0;i<len;i++)
    {
        if(key ==a[i])
        {
            ret =i;
            break;
        }
    }
    return ret;
}

int main()
{
    int a[]={1,3,2,5,12,35,23,54,34,9};
    int r=search(12,a,sizeof(a)/sizeof(a[0]));
    printf("%d\n",r);
    return 0;
}