Find whether a number is present in another number as a substring or not without using Arrays

Question:

Write a program to take two numbers from the user and find whether the second number is present in the first number or not without using arrays.

For example:

Suppose the first number is 152643798

And the second number is 43

So we can say that the second number is present in the first number.

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#include<stdio.h>

int isPresent(long long int a,long long int b)

{

    long long int ca,cb;

    ca=a;

    cb=b;

    while(a)

    {

        while(a && b)

        {

            if(a%10 == b%10)

            {

                a/=10;

                b/=10;

            }

            else

                break;

        }

        if(!b)

            return 1;

        ca/=10;

        a=ca;

        b=cb;

    }

    return 0;

}

int main()

{

    long long int num,n;

    printf("Enter two numbers : \n");

    scanf("%lld%lld",&num,&n);

    if(isPresent(num,n))

        printf("YES\n");

    else

        printf("NO\n");

    return 0;

}

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