How to calculate greatest of four no. using nested if?

CODE

How to calculate greatest of four no. using nested if

int main()

{

    int a,b,c,d;

    printf("\n enter the value of a,b,c,d:");

    scanf("%i%d%d%d",&a,&b,&c,&d);

    if(a>b)

    {

        if(a>c)

        {

            if(a>d)

                printf("\n a is greatest");

            else

                printf("\n d is greatest");

        }

        else

            if(c>d)

                printf("\n c is greatest");

            else

                printf("\n d is greatest");

    }

    else

        if(b>c)

        {

            if(b>d)

                printf("\n b is greatest");

            else

                printf("\n d is greatest");

        }

        else

            if(c>d)

                printf("\n c is greatest");

            else

                printf("\n d is greatest");

}

Output:

enter the value of a,b,c,d:

2

5

6

3

 c is greatest