/* 

  Program: Largest of Three (nested if-else) — U1

  What it does:

    - Reads integers a, b, c.

    - Uses nested if-else to print which value is largest.

    - Also handles: a==b==c (all equal) and "two numbers tie for largest".

*/

#include <stdio.h>

int main(void) {

    int a, b, c;

    printf("Enter three integers (a b c): ");

    if (scanf("%d %d %d", &a, &b, &c) != 3) {

        printf("Invalid input. Please enter three integers.\n");

        return 0;

    }

    /* All equal? Handle upfront. */

    if (a == b && b == c) {

        printf("All three numbers are equal: %d\n", a);

    } else {

        /* Nested comparisons */

        if (a >= b) {

            if (a > c) {

                /* a is strictly largest; if a==b (possible because a>=b), b<a since a>c and c compares against a */

                if (a == b) {

                    printf("Two numbers tie for largest: a and b = %d\n", a);

                } else {

                    printf("Largest = %d (a)\n", a);

                }

            } else if (a == c) {

                printf("Two numbers tie for largest: a and c = %d\n", a);

            } else {

                printf("Largest = %d (c)\n", c);

            }

        } else { /* b > a */

            if (b > c) {

                printf("Largest = %d (b)\n", b);

            } else if (b == c) {

                printf("Two numbers tie for largest: b and c = %d\n", b);

            } else {

                printf("Largest = %d (c)\n", c);

            }

        }

    }

    /* Examples:

       a=10, b=7,  c=9   -> Largest = 10 (a)

       a=8,  b=15, c=15  -> Two numbers tie for largest: b and c = 15

       a=5,  b=5,  c=5   -> All three numbers are equal: 5

    */

    return 0;

}