Write a C Program to display pattern with execution Explanation for Beginners.

Pattern:
*
**
***
****
*****

Solution:
#include < stdio.h >
int main()
{
int i, j, rows;
printf("Enter number of rows: ");
scanf("%d", &rows);
for(i=1; i<=rows; i++)
{
for(j=1; j<=i; j++)
{
printf("* ");
}
printf("\n");
}
return 0;
}


Explanation of how FOR loops are working internally:

i is for the number of Rows

j is for the number of Columns

We have declared “Rows” name variable for that value t is taken from the user.

Suppose User Enters 4 that means

Rows=4;

Value of i	For loop i Condition i<=4	increment i++	value of j	For Loop j condition j<=i	increment j++	Output
1	1<=4 (TRUE)	Incremented the value of i by 1 now i=2	1	1<=1 (TRUE)	Incremented the value of J by 1 now j=2	*
			2	2<=1 (FALSE)	Comes out of j for loop and reset the value of j to 1 now j=1	*
2	2<=4 (TRUE)	Incremented the value of i by 1 now i=3	1	1<=2 (TRUE)	Incremented the value of J by 1 now j=2	*
						*
			2	2<=2 (TRUE)	Incremented the value of J by 1 now j=3	*
						**
			3	3<=2 (FALSE)	Comes out of j for loop and reset the value of j to 1 now j=1	*
						**
3	3<=4 (TRUE)	Incremented the value of i by 1 now i=4	1	1<=3 (TRUE)	Incremented the value of J by 1 now j=2	*
						**
						*
			2	2<=3 (TRUE)	Incremented the value of J by 1 now j=3	*
						**
						**
			3	3<=3 (TRUE)	Incremented the value of J by 1 now j=3	*
						**
						***
			4	4<=3 (FALSE)	Comes out of j for loop and reset the value of j to 1 now j=1	*
						**
						***
4	4<=4 (TRUE)	Incremented the value of i by 1 now i=5	1	1<=4 (TRUE)	Incremented the value of J by 1 now j=2	*
						**
						***
						*
			2	2<=4 (TRUE)	Incremented the value of J by 1 now j=3	*
						**
						***
						**
			3	3<=4 (TRUE)	Incremented the value of J by 1 now j=4	*
						**
						***
						***
			4	4<=4 (TRUE)	Incremented the value of J by 1 now j=5	*
						**
						***
						****
			5	5<=4 (FALSE)	Comes out of j for loop and reset the value of j to 1 now j=1	*
						**
						***
						****
5	5<=4 (FALESE)	Comes out of i for loop