Searching an array for another array
I am writing this program to read 2 strings and to check if the 1st string is a sub-string of the 2nd. I need help writing my function that searches string 2 for string 1 and returns the element number of the first match if it is a sub-string and returns -1 if it is not a sub-string. The function declaration I need help with is:
int str_search(char s1[], int n1,char s2[], int n2);
Code:
#include <stdio.h>
#define maxlen 50
void str_set(char s[], int n, char a);
void str_set(char s[], int n, char a)
{
int i=n;
for(n=0; n<i; n++)
{
a=getchar();
s[n] = a;
if(a == '\n')
break;
}
}
void str_print(char s[], int n);
void str_print(char s[], int n)
{
int i=n+1;
for(n=0; n<i; n++)
{
printf("%c", s[n]);
if(s[n] == '\n')
break;
}
}
int str_search(char s1[], int n1,char s2[], int n2);
int str_search(char s1[], int n1,char s2[], int n2)
{
}
main()
{
char s1;
char s3;
char s[maxlen]={32};
char s2[maxlen]={32};
int n;
printf("Enter string A.\n");
str_set(s, maxlen, s1);
printf("\nEnter string B.\n");
str_set(s2, maxlen, s3);
printf("\nString A:\t");
str_print(s, maxlen);
printf("\nString B:\t");
str_print(s2, 40);
n = str_search(s, 50, s2, 50);
if(n == -1)
printf("\nString A is not a sub-string of String B.");
else
printf("\nString A is a sub-string of String B.");
}
