TCS Coding Practice Question | Greatest of 3 Numbers

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

// 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.");
    }
}

Output:

• In C:

  

• In Java: