26 December 2011

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

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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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