Program to check given Substring is present in a string - My CS Tutorial

C program to check Substring with a string.
By this problem we will check whether a given substring is present in a given string.
In this post we will discuss that how to write a c program to check or find
whether a substring is present or available in a string.

In the first user will enter a string after it enter a substring then the compiler check that the given substring is available in string or not and print the statement.

Code

#include<stdio.h>

#include<conio.h>

#include<string.h>

void main()

{

int flag=0,len1,len2,a,b;

char st[100],sub[100];

clrscr();

printf("\n ENTER A STRING OR SENTENCE:\n ");

gets(st);

printf("\n ENTER A WORD OR SUBSTRING TO BE SEARCHED:\n ");

gets(sub);

len1=strlen(st);

len2=strlen(sub);

for(a=0;a<=len1-len2;a++)

{

    for(b=a;b<a+len2;b++)

    {

        flag=1;

        if(st[b]!=sub[b-a])

        {

            flag=0;

            break;

        }

    }

    

    if(flag==1)

    break;

}

if(flag==1)

{

    printf("\n SEARCH WORD OR SUBSTRING IS AVAILABLE.\n ");

}

else

{

        printf("\n SEARCH WORD OR SUBSTRING IS NOT AVAILABLE.\n ");

}

getch();

}

OUTPUT:

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Created by-- HARSH CHAUHAN