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TCS Coding Practice Question | Swap two Numbers

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Given two numbers, the task is to swap the two numbers using Command Line Arguments. Examples:

Input: n1 = 10, n2 = 20
Output: 20 10

Input: n1 = 100, n2 = 101
Output: 101 100

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 num1 and num2
  • Get the sum in one of the two given numbers.
  • The numbers can then be swapped using the sum and subtraction from the sum.

Program: 

C

// C program to swap the two numbers
// using command line arguments
  
#include <stdio.h>
#include <stdlib.h> /* atoi */
  
// Function to swap the two numbers
void swap(int x, int y)
{
    // Code to swap ‘x’ and ‘y’
  
    // x now becomes x+y
    x = x + y;
  
    // y becomes x
    y = x - y;
  
    // x becomes y
    x = x - y;
  
    printf("%d %d\n", x, y);
}
  
// Driver code
int main(int argc, char* argv[])
{
  
    int num1, num2;
  
    // 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]);
  
        // Swap the numbers and print it
        swap(num1, num2);
    }
    return 0;
}

                    

Java

// Java program to swap the two numbers
// using command line arguments
  
class GFG {
  
    // Function to swap the two numbers
    static void swap(int x, int y)
    {
        // Code to swap ‘x’ and ‘y’
  
        // x now becomes x+y
        x = x + y;
  
        // y becomes x
        y = x - y;
  
        // x becomes y
        x = x - y;
  
        System.out.println(x + " " + y);
    }
  
    // 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]);
  
            // Swap the numbers
            swap(num1, num2);
        }
        else
            System.out.println("No command line "
                               + "arguments found.");
    }
}

                    

Output:

  • In C:
  • In Java:

Time Complexity: O(1)
Auxiliary Space: O(1)



Last Updated : 11 Jan, 2023
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