Question

Write a program which will ask the user to input a choice ch and the height of the triangle h and print either of the following patterns based on the user’s selection. Ch=1 h=4
output :
1
12
123
1234
Ch=2 h=5 output :
12345
1234
123
12
1

Answer 1

Answer:

// C++ code to demonstrate printing

// pattern of numbers

#include <iostream>

using namespace std;

// Function to demonstrate printing

// pattern

void numpat(int n)

{

// initializing starting number

int num = 1;

// Outer loop to handle number of rows

// n in this case

for (int i = 0; i < n; i++) {

// Inner loop to handle number of columns

// values changing acc. to outer loop

for (int j = 0; j <= i; j++)

cout << num << " ";

// Incrementing number at each column

num = num + 1;

// Ending line after each row

cout << endl;

}

}

// Driver Function

int main()

{

int n = 5;

numpat(n);

return 0;

}

Answer 2

Answer:

I have written a python program for this. I hope this is helpful for you. It works 100% as per your choice and height.

Explanation:

ch = int(input("Enter your choice for the type of triangle (1 or 2): "))

h = int(input("Enter height of the triangle"))

if ch == 1:

i = 1

while i <= h:

 j = 1

 while j <= i:

  print(j, end=' ')

  j = j+1

 print()

 i = i+1

else:

i = h

while i >= 1:

 j = 1

 while j <= i:

  print(j, end=' ')

  j = j+1

 print()

 i = i-1