Computer Applications
Write a menu driven program that prompts the user to select one of the four triangle patterns (a, b, c, or d). The program then accepts number of rows and prints the selected pattern as shown below:
Enter the size : 8
(a)
#
# #
# # #
# # # #
# # # # #
# # # # # #
# # # # # # #
# # # # # # # #
(b)
# # # # # # # #
# # # # # # #
# # # # # #
# # # # #
# # # #
# # #
# #
#
(c)
# # # # # # # #
# # # # # # #
# # # # # #
# # # # #
# # # #
# # #
# #
#
(d)
#
# #
# # #
# # # #
# # # # #
# # # # # #
# # # # # # #
# # # # # # # #
Answer
import java.util.Scanner;
public class KboatTriangleChoice
{
public static void main(String args[]) {
Scanner in = new Scanner(System.in);
System.out.println("Type a for Pattern a");
System.out.println("Type b for Pattern b");
System.out.println("Type c for Pattern c");
System.out.println("Type d for Pattern d");
System.out.print("Enter your choice: ");
char ch = in.next().charAt(0);
System.out.print("Enter the number of terms: ");
int n = in.nextInt();
switch (ch) {
case 'a':
for (int i = 1; i <= n; i++) {
for (int j = 1; j <= i; j++)
System.out.print('#');
System.out.println();
}
break;
case 'b':
for (int i = n; i >= 1; i--) {
for (int j = 1; j <= i; j++)
System.out.print('#');
System.out.println();
}
break;
case 'c':
for (int i = n; i >= 1; i--) {
for (int j = i; j < n; j++)
System.out.print(" ");
for (int k = 0; k < i; k++)
System.out.print('#');
System.out.println();
}
break;
case 'd':
for (int i = n; i >= 1; i--) {
for (int j = 1; j < i; j++)
System.out.print(" ");
for (int k = i; k <= n; k++)
System.out.print('#');
System.out.println();
}
break;
default:
System.out.println("Incorrect choice");
break;
}
}
}Output
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Enter the size: 8
(a)
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