WAP to swap two numbers in Java
Logical Steps (Using Third Variable):
-
To swap two numbers using third variable, follow these steps:
- Take two numbers as an input from user.
-
Use two integer variables (
no1andno2) to hold the input values. -
Declare a third variable (
temp) to temporarily store the value of one variable during the swap. -
Swap the Values:
-
Assign the value of
no1totemp. -
Assign the value of
no1tono1. -
Assign the value of
temptono2.
-
Assign the value of
-
Print the values of
no1andno2after swapping.
Programs:
-
Below is the simple program:
public class SwapNumbers { public static void main(String[] args) { int no1=22, no2=33; // Display numbers before swapping System.out.println("Before swapping: no1 = " + no1 + ", no2 = " + no2); // Swap using a third variable int temp = no1; no1 = no2; no2 = temp; // Display numbers after swapping System.out.println("After swapping: no1 = " + no1 + ", no2 = " + no2); } }Output:
Before swapping: a = 22, b = 33 After swapping: a = 33, b = 22
-
Below is the program by taking user input:
import java.util.Scanner; public class SwapNumbers { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); // Take input from the user System.out.print("Enter the first number (no1): "); int no1 = scanner.nextInt(); System.out.print("Enter the second number (no2): "); int no2 = scanner.nextInt(); // Display numbers before swapping System.out.println("Before swapping: no1 = " + no1 + ", no2 = " + no2); // Swap using a third variable int temp = no1; no1 = no2; no2 = temp; // Display numbers after swapping System.out.println("After swapping: no1 = " + no1 + ", no2 = " + no2); // Close the scanner scanner.close(); } }Output:
Enter the first number (a): 100 Enter the second number (b): 200 Before swapping: a = 100, b = 200 After swapping: a = 200, b = 100
Logical Steps (Without Using Third Variable):
-
To find the factorial of a number, follow these steps:
- Take two numbers as an input from user.
-
Use two integer variables (
no1andno2) to hold the input values. -
Use arithmetic operations to swap the values:
-
a = a + b -
b = a - b -
a = a - b
-
-
Print the values of
no1andno2after swapping.
Programs:
-
Below is the simple program:
public class SwapNumbers2 { public static void main(String[] args) { int no1=33, no2=44; // Display numbers before swapping System.out.println("Before swapping: no1 = " + no1 + ", no2 = " + no2); // Swap without using a third variable no1 = no1 + no2; no2 = no1 - no2; no1 = no1 - no2; // Display numbers after swapping System.out.println("After swapping: no1 = " + no1 + ", no2 = " + no2); } }Output:
Before swapping: no1 = 33, no2 = 44 After swapping: no1 = 44, no2 = 33
-
Below is the program by taking user input:
import java.util.Scanner; public class SwapNumbers2 { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); // Take input from the user System.out.print("Enter the first number (no1): "); int no1 = scanner.nextInt(); System.out.print("Enter the second number (no1): "); int no2 = scanner.nextInt(); // Display numbers before swapping System.out.println("Before swapping: no1 = " + no1 + ", no2 = " + no2); // Swap without using a third variable no1 = no1 + no2; no2 = no1 - no2; no1 = no1 - no2; // Display numbers after swapping System.out.println("After swapping: no1 = " + no1 + ", no2 = " + no2); // Close the scanner scanner.close(); } }Output:
Enter the first number (no1): 555 Enter the second number (no1): 888 Before swapping: no1 = 555, no2 = 888 After swapping: no1 = 888, no2 = 555
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