How to find palindrome using functions without arguments?

CODE

How to find palindrome using functions without arguments?

//Write a program to find palindrome using functions without arguments..

int main()

{

    void pal();

    pal();

}

void pal()

{

    int n,r,rev=0,m;

    printf("\n enter N:");

    scanf("%d",&n);

    m=n;

    while(m!=0)

    {

        r=m%10;

        rev=rev*10+r;

        m=m/10;

    }

    if (rev==n)

        printf("\n Number is palindrome");

    else

        printf("\n Number is not palindrome");

}

Output:

enter N:4564

 Number is not palindrome