pattern

A program that will generate above pattern:

#include<stdio.h>
// this program works well when the value of rows is less than 20
void main()
{

 int n = 5;
 int i = 0 , j = 0 , k = 0;

 int temp = 0 ;
 printf("Enter no of rows: ");

 scanf("%d",&n);
 temp = n;
 for(i = 0; i<n ;i++)
 {

  // logic for space
  for(k = 0 ; k < temp ; k++ )
  {

   printf("  ");
  }
  temp--;
  // for printing the actuak number
  for(j = 0; j <= i ; j++)
  {

   printf("%3d ", fun(i,j,n));
  }
  printf("\n");
 }
}

int fun(int a , int b, int n )
{

 int sum = 0 ;
 int i = 0 , j = 0;

 for(i = n-1 ; i >= 0 ; i--)
 {

  for(j = 0 ; j <= i ; j++)
  {

   sum++;
   if( i==a && b==j )
   {

    return sum;
   }
  }
 }
 return sum;
}