TCS Coding Practice Question | Greatest of 3 Numbers

Last Updated : 11 Jan, 2023

Given three numbers, the task is to find the greatest of three numbers using Command Line Arguments.

Examples:

Input: A = 2, B = 8, C = 1
Output: 8

Input: A = 231, B = 4751, C = 75821
Output: 75821

Approach:

Since the numbers are entered as Command line Arguments, there is no need for a dedicated input line
Extract the input numbers from the command line argument
This extracted numbers will be in String type.
Convert these numbers into integer type and store it in variables, say A, B and C
Find the greatest of the numbers as follows:
- Check if A is greater than B.
  - If true, then check if A is greater than C.
    - If true, print 'A' as the greatest number.
    - If false, print 'C' as the greatest number.
  - If false, then check if B is greater than C.
    - If true, print 'B' as the greatest number.
    - If false, print 'C' as the greatest number.
Print or return the greatest numbers

Program:

// C program to compute the greatest of three numbers
// using command line arguments

#include <stdio.h>
#include <stdlib.h> /* atoi */

// Function to compute the greatest of three numbers
int greatest(int A, int B, int C)
{

    if (A >= B && A >= C)
        return A;

    if (B >= A && B >= C)
        return B;

    return C;
}

// Driver code
int main(int argc, char* argv[])
{

    int num1, num2, num3;

    // Check if the length of args array is 1
    if (argc == 1)
        printf("No command line arguments found.\n");

    else {

        // Get the command line argument and
        // Convert it from string type to integer type
        // using function "atoi( argument)"
        num1 = atoi(argv[1]);
        num2 = atoi(argv[2]);
        num3 = atoi(argv[3]);

        // Find the greatest and print it
        printf("%d\n", greatest(num1, num2, num3));
    }
    return 0;
}

Java

// Java program to compute the greatest of three numbers
// using command line arguments

class GFG {

    // Function to compute the greatest of three numbers
    static int greatest(int A, int B, int C)
    {

        if (A >= B && A >= C)
            return A;

        if (B >= A && B >= C)
            return B;

        return C;
    }

    // Driver code
    public static void main(String[] args)
    {

        // Check if length of args array is
        // greater than 0
        if (args.length > 0) {

            // Get the command line argument and
            // Convert it from string type to integer type
            int num1 = Integer.parseInt(args[0]);
            int num2 = Integer.parseInt(args[1]);
            int num3 = Integer.parseInt(args[2]);

            // Find the greatest
            int res = greatest(num1, num2, num3);

            // Print the greatest
            System.out.println(res);
        }
        else
            System.out.println("No command line "
                               + "arguments found.");
    }
}