Print Triangle pattern in python

Triangle Number Pattern

Problem Description: You are given with an input number N, then you have to print the given star pattern corresponding to that number N.

For example if N=4 Pattern output : 1

22

333

4444

How to approach?

1. Take N as input from the user.

2. Figure out the number of rows, (which is N here) and run a loop for that.

3. Now, figure out how many columns are to be printed in ith row and run a loop for that within this.

4. Now, figure out “What to print?” in a (row, column) number. It can depend on the column number, row number or N.

Pseudo code for the given problem:

input=N i=1

While i is less than or equal to N:

j=1

While j is less than or equal to i:

print(i) Increment j by 1

Increment i by 1 Add a new line here

❏ Let us dry run the Code for N=4

● i=1(<=4)

➔ j=1(<=1), so print ”1”

➔ j=2 (>1), move out of the inner loop with a new line

● i=2(<=4)

➔ j=1 (<=2), so print “2”

➔ j=2 (<=2), so print “2”

➔ j=3(>2), move out of the inner loop with a new line

● i=3(<=4)

➔ j=1(<=3), so print “3”

➔ j=2(<=3), so print “3”

➔ j=3(<=3), so print “3”

➔ j=4(>3), move out of the inner loop with a new line

● i=4(<=4)

➔ j=1(<=4), so print “4”

➔ j=2(<=4), so print “4”

➔ j=3(<=4), so print “4”

➔ j=4(<=4), so print “4”

➔ j=5(>4), move out of the inner loop with a new line

● i=5(>4), move out of the loop So , final output:

1

22

333

4444

CODE:

## Read input as specified in the question

## Print the required output in given format

n = int(input())

i = 1

while i <= n:

    j = 1

    while j <= i: 

        print(i, end = '')

        j = j+1

    print()

    i = i + 1

Sample Input:

5

Sample Output :

1

22

333

4444

55555