Find all occurrences of pattern in a string

Find all occurrences of pattern(pat) in a a string(txt)

#include<stdio.h>

#include<string.h>

void main()

{

                char txt[30],  pat[30];

                int m, n;

                int i, j, found = 0;

                printf("\nEnter the main string:");

                gets(txt);

                printf("\nEnter the pattern to be searched: ");

                gets(pat);

                m = strlen(txt);

                n = strlen(pat);

                for(i=0;  i<=m-n;  i++)

                {

                                found  = 1;

                                for(j=0; j<n; j++)

                                {

                                                if(txt[i+j] != pat[j])

                                                {

                                                                found = 0;

                                                                break;

                                                }

                                }

                                if(found == 1)

                                                printf("\n The pattern found at index:%d",  i);

                }

                if(found  ==  0)

                                printf("\n   Pattern not found");

}

Output:

Enter the main string:    hello hii how hii

Enter the pattern to be searched:    hii

The pattern found at index:  6

The pattern found at index:   14