Printing " * " in Right Angle Shape program 1 ||Star Pattern

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 Write a program printing stars " * " in Right Angle Triangle Shape pattern program ?

Hello guys and welcome to Python programming tutorials by kriisheditz.

Today in this tutorial we will discuss about a pattern program, that is we need our output

in this pattern that is a single star in first line, two star in the second line, 3 star

in the third line, 4 star in 4th line etc.

So we'll see how to write a program to get output like this.

Before going to the program we will see what are the requirements of the program, that

is first input that is we will ask the user to enter the input that is how many rows he

want.

We can see this pattern contains 5 rows but in our program we will ask the user to enter

the number of rows.

Second one is for loop, for this program we need two for loops that is we can see here

rows and columns.

So for row we need one for loop, for columns we need another for loop, so we need two for

loop.

And third is range function in our program we are using range function we already discussed

about the range function in our tutorial and again I'll explain you.

And in the range function we will use key as ‘range’ and it takes two arguments

one is start and one is end and range function is used to print the continuous number that

is if I want zero to 10 numbers, then I can mention here that is zero and i need to mention

11 here it's because here zero is included here, and 11 is excluded.

That is if I want integer from zero to 10, then i need to mention zero and 11 here.

Ok if you want to see this i will use for loop int range 0 to 11.

And here we can see if I want 0 to 10 numbers then I need to mention 0 and 11 here and to

print continuous numbers we will use range function.

And next last is print function that is, if you type help and print and this is the syntax

of print function and here we can see end is ‘\n’.

That is if i use print function here, and I'll write ‘hello’ and I'll separate this,

next i will write next line that is print “hi” ok.

Now i will enter.

We can see “hello” and “hi” in different lines.

Once it will write this “hello” message to the screen as we see in the print syntax

end is equal to “\n” and we didn't mention Anything here so by default it will go to

the next line and it will print the next message and here print “hello”, and I'll change

this end to space i will separate this and I will use print “hi” ok.

Now I will enter this, we can see “hello” and “hi” in the same line and it is separated

by a space.

it's because we use end as space here ok.

Now we'll go to our pattern program and first, we need to ask the user to enter the input.

So I'll use one variable called “num” , and I will ask the user to enter the number

of rows and it is an integer value, so I'll use int, input function “enter the number

of rows” ok, now I will use for loop.

It is first for loop for rows, so for i in range function and i will take the value from

1, so 1 to num+1.

As i said in the range function, it is included and this values excluded.

if the user entered the value 5, then we want value 1 to 5, so i mention num+ 1, so it is

6 now so it will give the value 1 to 5.

And here within the for function, I'll use another for and j in range here also I'll

use 1 and i+1 ok.

Now i will print, i want to print star”*” right, so i will print star and here, I will

mention end is equal to space ok.

Now I will go out of this for loop, and in the first for loop I'll write a print function

and now I will save this and run this, now enter the number of rows i will enter 5, and

here we can see 1 2 3 4 and 5 right ok.

First here we will ask the user to enter the number of rows, so we entered 5 here, so value

of num is 5 ok, and coming to the for loop range 1 to num+1 so range value is 1 and 6

ok.

So it will give 1 2 3 4 and 5 ok.

Now first i value is 1 here.

Next it will go to the j th loop and here it's range is 1 to i+1.

So now here range is 1 to i+1 that is, 2 so it will give 1.

j value is 1 here.

So it will go to the print statement and it will print the star and it will take end as

space and again it will go to the for loop.

But here in the range function, it will give only one value that is 1 so it is already

executed so it will come out of this loop, and it will execute this print statement that

is it will give new line.

So we got first star and the control goes to the next line now.

Next here again it will go to the for loop and now i value is 2.

so i value is 2 now.

And again it will go to the for loop, because of the i value is 2, here it is 1 to i+1.

That is 1 to 3 , 1 and 3 . so it will give value 1 and 2.

now again j value is 1, and it will print this star that is this star, and next it will

print this space.

Again it will go to this loop and now j value will be incremented to 2 and it will go to

this print statement and it will print this star okay.

After this here range function gives only two value so, after this it will come out

of this loop and it will print this, so it will go to the next line.

Like this it will continue the execution and it will print this Pattern.

ok that's it for now thank you for watching don't forget to subscribe my channel I'll

meet you next class till then take care .

Video tutorial to this program

Program :

num=int(input("enter the number of rows :"))

for i in range(1,num+1):

 for j in range(1,i+1):

  print("*",end=" ")

 print()

Output :

enter the number of rows :30

*

* *

* * *

* * * *

* * * * *

* * * * * *

* * * * * * *

* * * * * * * *

* * * * * * * * *

* * * * * * * * * *

* * * * * * * * * * *

* * * * * * * * * * * *

* * * * * * * * * * * * *

* * * * * * * * * * * * * *

* * * * * * * * * * * * * * *

* * * * * * * * * * * * * * * *

* * * * * * * * * * * * * * * * *

* * * * * * * * * * * * * * * * * *

* * * * * * * * * * * * * * * * * * *

* * * * * * * * * * * * * * * * * * * *

* * * * * * * * * * * * * * * * * * * * *

* * * * * * * * * * * * * * * * * * * * * *

* * * * * * * * * * * * * * * * * * * * * * *

* * * * * * * * * * * * * * * * * * * * * * * *

* * * * * * * * * * * * * * * * * * * * * * * * *

* * * * * * * * * * * * * * * * * * * * * * * * * *

* * * * * * * * * * * * * * * * * * * * * * * * * * *

* * * * * * * * * * * * * * * * * * * * * * * * * * * *

* * * * * * * * * * * * * * * * * * * * * * * * * * * * *

* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * 

[Program finished]

Output :

enter the number of rows :10

*

* *

* * *

* * * *

* * * * *

* * * * * *

* * * * * * *

* * * * * * * *

* * * * * * * * *

* * * * * * * * * *

[Program finished]

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