Programming Example
Question 7
Study this program carefully to understand the logic, output, and explanation in a structured way.
Using the switch statement, write a menu driven program to perform following operations:
(i) To Print the value of Z where Z = (x3 + 0.5x) / Y where x ranges from – 10 to 10 with an increment of 2 and Y remains constant at 5.5.
(ii) To print the Floyds triangle with N rows
Example: If N = 5, Output:
1
2 3
4 5 6
7 8 9 10
11 12 13 14
import java.util.Scanner;
public class RansariMenu
{
public static void main(String args[]) {
Scanner in = new Scanner(System.in);
System.out.println("Type 1 for Value of Z");
System.out.println("Type 2 for Floyd\'s triangle");
System.out.print("Enter your choice: ");
int choice = in.nextInt();
switch (choice) {
case 1:
double Z, Y = 5.5;
for (int x = -10; x <= 10; x+= 2) {
Z = (Math.pow(x, 3) + 0.5 * x) / Y;
System.out.println("Value of Z when x is "
+ x + " = " + Z);
}
break;
case 2:
System.out.print("Enter number of rows: ");
int N = in.nextInt();
int t = 1;
for (int i = 1; i <= N; i++) {
for (int j = 1; j <= i; j++) {
System.out.print(t + " ");
t++;
}
System.out.println();
}
break;
default:
System.out.println("Incorrect Choice");
break;
}
}
}First read the algorithm, then study the program code line by line. After that, compare the code with the output and finally go through the explanation. This approach helps learners understand both the logic and the implementation properly.
After understanding this example, try to rewrite the same program without looking at the code. Then change some values or logic and run it again. This helps improve confidence and keeps learners engaged on the page for longer.