c#include <stdio.h>
int main()
{
  int row, c, n;

  printf("Enter the number of rows in pyramid of stars to print\n");
  scanf("%d", &n);

  for (row = 1; row <= n; row++)  // Loop to print rows
  {
    for (c = 1; c <= n-row; c++)  // Loop to print spaces in a row
      printf(" ");

    for (c = 1; c <= 2*row - 1; c++) // Loop to print stars in a row
      printf("*");

    printf("\n");
  }

  return 0;
}

outputs:

Enter the number of rows in pyramid of stars to print

5

    *

   ***

  *****

 *******

*********