Python Program to print the pattern ‘G’
Last Updated :
27 Jul, 2023
In this article, we will learn how to print the pattern G using stars and white-spaces. Given a number n, we will write a program to print the pattern G over n lines or rows.
Examples:
Input : 7
Output :
***
*
*
* ***
* *
* *
***
Input : 9
Output :
*****
*
*
*
* ***
* *
* *
* *
*****
In this program, we have used the simple logic of iteration over lines to create the pattern G. Please look at the image below which represents the pattern G in the form of a 2-d matrix, where mat[i][j] = ‘ij’:
If we try to analyze this picture with a (row, column) matrix and the circles represent the position of stars in the pattern G, we will learn the steps. Here we are performing the operations column-wise. So for the first line of stars, we set the first if condition, where the row position with 0 and (n-1) won’t get the stars and all other rows from 1 to (n-1), will get the stars. Similarly, for the second, third and fourth column we want stars at the position row = 0 and row = (n-1). The other steps are self-explanatory and can be understood from the position of rows and columns in the diagram.
Below is the implementation of above idea:
Python
def Pattern(line):
pat = ""
for i in range ( 0 ,line):
for j in range ( 0 ,line):
if ((j = = 1 and i ! = 0 and i ! = line - 1 ) or ((i = = 0 or
i = = line - 1 ) and j > 1 and j < line - 2 ) or (i = = ((line - 1 ) / 2 )
and j > line - 5 and j < line - 1 ) or (j = = line - 2 and
i ! = 0 and i ! = line - 1 and i > = ((line - 1 ) / 2 ))):
pat = pat + "*"
else :
pat = pat + " "
pat = pat + "
"
return pat
line = 7
print (Pattern(line))
|
Output:
***
*
*
* ***
* *
* *
***
Time Complexity: O(n2), where n represents the given input.
Auxiliary Space: O(1), no extra space is required, so it is a constant.
Please refer complete article on Program to print the pattern ‘G’ for more details!
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