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Write a Python program to accept a positive integer n from the user and then print the following pattern using nested loops. For example, if n = 5, the output should be:
*
* *
* * *
* * * *
* * * * *
Answer:
Answer by student
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n = int(input( "Enter a positive integer: " )) for i in range( 1 , n+ 1 ): for j in range(i): print( "*" , end= " " ) print() |
Detailed answer by teachoo
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- To print the pattern, we need to use nested loops . A nested loop is a loop inside another loop. The inner loop executes for each iteration of the outer loop.
- We first ask the user to enter a positive integer n and store it in a variable n using the input() and int() functions.
- Then we use a for loop to iterate from 1 to n using the range() function. The variable i represents the current row number and also the number of stars to be printed in that row.
- Inside the for loop, we use another for loop to iterate from 0 to i-1 using the range() function. The variable j represents the current column number and is not used for any other purpose.
- Inside the inner loop, we print a star followed by a space using the print() function with the end parameter set to " " . This means that the next print statement will not start from a new line but from the same line with a space after the star.
- After the inner loop ends, we print a newline using the print() function without any argument. This means that the next print statement will start from a new line.
- This way, we print n rows of stars with an increasing number of stars in each row.
So, the correct answer is:
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n = int(input( "Enter a positive integer: " )) for i in range( 1 , n+ 1 ): for j in range(i): print( "*" , end= " " ) print() |
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