PTA 7-4 查找指定字符

#include<stdio.h>
#include<string.h>
int main()
{
    char a;
    char arr[10000];
    scanf("%c", &a);
    getchar();
    gets(arr);
    int index=-1;
    int right = strlen(arr);
    for (int i = 0; i < right; i++)
    {
        if (a == arr[i])
        {
            index = i;
            continue;
        }   
    }
    if (index != -1)
        printf("index = %d", index);
    else if (index == -1)
        printf("Not Found");
    return 0;
}