Hollow Right Triangle Given an integer number N as input. Write a program to print the hollow right-angled triangular pattern of N lines as shown below. Note: There is a space after each asterisk (*) character. Input The first line of input is an integer N. Explanation In the given example the hollow right angled triangle of side 4. Therefore, the output should be * * * * * * * * * Sample Input 1 4 Sample Output 1 * * * * * * * * * Sample Input 2 6 Sample Output 2 * * * * * * * * * * * * * * *
N=int(input()) for i in range(1,N+1): for j in range(1,N+1): if (j==N or i==1 or j==i): print("*", end = " ") else: print (" ", end = " ") print()
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Hollow Right Triangle - 2 Given an integer number N as input. Write a program to print the hollow right-angled triangular pattern of N lines as shown below. Note: There is a space after each asterisk (*) character. Input The first line of input is an integer N. Explanation In the given example the hollow right angled triangle of side 5. Therefore, the output should be * * * * * * * * * * * * Sample Input 1 4 Sample Output 1 * * * * * * * * * Sample Input 2 5 Sample Output 2 * * * * * * * * * * * *
N=int(input()) for i in range(N): for j in range(N): if (j==N-1 or i==N-1 or (j+i==N-1)): print("*", end = " ") else: print (" ", end = " ") print()
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In this shot, we will discuss how to generate a hollow right-angled triangle with stars in Python.
We can print a plethora of patterns with Python. The basic and only prerequisite is a good understanding of how loops work in Python.
Here, we will use simple for loops to generate a hollow right-angled triangle with stars.
Description
A triangle is said to be right-angled if it has an angle equal to 90 degrees on its left side.
We will use 2 for loops:
- Outer loop: To handle the number of rows.
- Inner loop: To handle the number of columns.
# Number of rows
n = 5
# Loop through rows
for i in range(1, n+1):
# Loop through columns
for j in range(1, n+1):
# Printing Pattern
if (i == j) or (j == 1) or (i == n):
print("*", end=" ")
else:
print(" ", end=" ")
print()
Explanation
In line 2, we take the input for the number of rows (i.e. the length of the triangle).
In line 4, we create a for loop to iterate through the number of rows.
In line 6, we create an inner nested for loop to iterate through the number of columns.
From lines 8 to 11, we use conditional statements to create the pattern. The end statement helps to stay on the same line.
In line 12, we use the print() statement to move to the next line.
CONTRIBUTOR
Vinisha Maheshwari
In this python example, we first read number of row in the hollow right angle triangle pattern from user using built-in function input(). And then we generate hollow right angle triangle pattern
using python's for loop. In this program print() only is used to bring control to new lines.This python program generates hollow right angle triangle pattern made of stars up to n lines.
Python Source Code: Hollow Right Angle Triangle Pattern
# Hollow Right Angle Triangle Pattern Using Stars
row = int(input('Enter number of rows required: '))
for i in range(row):
for j in range(i+1):
if j==0 or j==i or i==row-1:
print('*',end=" ")
else:
print(" ", end=" ")
print()
Output
Enter number of rows required: 8
*
* *
* *
* *
* *
* *
* *
* * * * * * * *
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