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/**
* C program to print equilateral triangle or pyramid star pattern
* atnyla.com
*/
#include <stdio.h>
int main()
{
int i, j, rows;
/* Input number of rows to print */
printf("Enter number of rows : ");
scanf("%d", &rows);
/* Iterate through rows */
for(i=1; i<=rows; i++)
{
/* Print leading spaces */
for(j=i; j<rows; j++)
{
printf(" ");
}
/* Print star */
for(j=1; j<=(2*i-1); j++)
{
printf("*");
}
/* Move to next line */
printf("\n");
}
return 0;
}Enter number of rows: 5
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Basic C programming, For loop, Nested loop
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Before you read further have a close look at the above pattern. The pattern consists of N (for this case 5) rows. Each row contain exactly 2 * N - 1 stars. In addition to stars the pattern has leading spaces. Each row contain N - i spaces (where i is current row number). To count total spaces per row point your mouse over the above pattern.
Step by step descriptive logic to print Pyramid star pattern.
for(i=1; i<=rows; i++).rows - 1. The loop structure should look like for(j=i; j. Inside this loop print single space.
Note: Iterating from 1 to N - i or i to rows - 1 both are equal.
2 * i - 1. The loop structure should look like for(j=1; j<=(2*i - 1); j++). Inside this loop print star.First read the algorithm, then study the program code line by line. After that, compare the code with the output and finally go through the explanation. This approach helps learners understand both the logic and the implementation properly.
After understanding this example, try to rewrite the same program without looking at the code. Then change some values or logic and run it again. This helps improve confidence and keeps learners engaged on the page for longer.