C Program to find position of sub-string in a String

Program to find position of sub-string in a String

#include<stdio.h>

#include<string.h>

void main()

{

char str[20] , pat[20] ;

int i=0,j,k=0 ;

printf("enter the first string :");

gets(str); // input main string

printf("\nenter the 2nd string : ");

gets(pat); //input sub-string or pattern

while(str[i]!='\0')

{

//if first character matches

if(str[i]==pat[0])

{

j=1;

//if next character of string and pattern same

while(pat[j]!='\0' && str[j+i]!='\0' && pat[j]== str[j+i]) 

{

j++;

k = 1;

}

if(pat[j]=='\0')

printf("pattern string found at %d position " , i+1);

}

i++;

if(k==0)

{

if(str[j+i]=='\0')

printf("pattern not found ") ;

}

}

}

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