从A列数据中挑出B列中的数据

完全匹配还是单个匹配？

#include <stdio.h>
#include <string.h>
void main()
{
char arr1[50], arr2[30];
int counter1, counter2;

printf("\n请输入A字符串：");
gets(arr1);
printf("\n请输入B字符串：");
gets(arr2);

for (counter1 = 0, counter2 = 0; arr1[counter1] != '\0' &&
arr2[counter2] != '\0'; counter1++)
{
if (arr1[counter1] == arr2[counter2])
{
counter2++;
}
else
{
counter1 = counter1 - counter2;
counter2 = 0;
}
}

if (arr2[counter2] == '\0')
{
printf("\nB字符串出现的位子为 [%d] \n", (counter1 - counter2 + 1));
}
else
{
printf("\nA字符串不包含B字符串");
}
}