The C Programming Language 练习题4-1

#include <stdio.h>

int stringdex(char s[], char t[])
{
int i, j, k, m;
m = 0;
for (i = 0; s[i] != '\0'; i++)
{
for (j=i, k=0; t[k]!='\0' && s[j]==t[k]; j++, k++)
;
if (k > 0 && t[k] == '\0' && i > m )
m = i;
}
if (m > 0)
return m;
else
return -1;
}

int main()
{
char line[] = "abcdefghijklmnopqrstuvwxyz1234abcdefghijkl";
char pattern[] ="efgh";
printf("%d\n", stringdex(line, pattern));
}