Hollow Triangle Star Pattern in C

In this tutorial, we will write a C program to print a hollow triangle star pattern. Before that, you may go through the following topics in C.

• for loop in C
• if..else statement in C

Hollow Triangle Pattern in C

Hollow equilateral triangle pattern in C.

#include <stdio.h>

int main()
{
  int i, j, k, rows;

  printf("Enter the no. of rows: ");
  scanf("%d", &rows);

  for (i = 1; i <= rows; i++)
  {
    for (j = i; j < rows; j++)
    {
      printf(" ");
    }

    for (k = 1; k <= (2 *i - 1); k++)
    {
      if (k == 1 || i == rows || k == (2 *i - 1))
        printf("*");
      else
        printf(" ");
    }
    printf("\n");
  }

  return 0;
}

Output: