🚀 Programming Example
Using switch statement, write a menu driven program to:
Learn this program step-by-step with algorithm, source code, output and detailed explanation.
Using switch statement, write a menu driven program to:
(i) To find and display all the factors of a number input by the user ( including 1 and the excluding the number itself).
Example:
Sample Input : n = 15
Sample Output : 1, 3, 5
(ii) To find and display the factorial of a number input by the user (the factorial of a non-negative integer n, denoted by n!, is the product of all integers less than or equal to n.)
Example:
Sample Input : n = 5
Sample Output : 5! = 1*2*3*4*5 = 120
For an incorrect choice, an appropriate error message should be displayed.
import java.util.Scanner;
public class RAnsariMenu
{
public static void main(String args[]) {
Scanner in = new Scanner(System.in);
System.out.println("1. Factors of number");
System.out.println("2. Factorial of number");
System.out.print("Enter your choice: ");
int choice = in.nextInt();
int num;
switch (choice) {
case 1:
System.out.print("Enter number: ");
num = in.nextInt();
for (int i = 1; i < num; i++) {
if (num % i == 0) {
System.out.print(i + " ");
}
}
System.out.println();
break;
case 2:
System.out.print("Enter number: ");
num = in.nextInt();
int f = 1;
for (int i = 1; i <= num; i++)
f *= i;
System.out.println("Factorial = " + f);
break;
default:
System.out.println("Incorrect Choice");
break;
}
}
}
First understand the algorithm carefully. Then study the program line-by-line and compare it with the output. Finally, review the explanation section to strengthen your logic and programming understanding.
Rewrite the program without looking at the code. Modify values, conditions or logic and run it again. This helps improve confidence and strengthens coding skills much faster.