Write a program in C language that prints the reverse Floyd triangle

Program Description

Freud's triangle is a right triangle array of natural numbers used in computer science education. It is named after Robert Floyd. It is defined by filling the rows of the triangle with consecutive numbers, starting with 1 in the upper left corner

1                               15 14 13 12 11
2 3                             10 9 8 7
4 5 6                         6 5 4
7 8 9 10                       3 2
11 12 13 14 15                 1
<strong>Floyd&#39;s Triangle                </strong><strong>Reverse of Floyd&#39;s Triangle</strong>

Algorithm

Print Freud's triangle:

Accept the number of rows to print the Floyd’s Triangle
Print value 1 for the Row 1
Print two values 2 and 3 in the next row
Print three values 4, 5 and 6 in the next row
Repeat till the number of rows specified

To print out the inverse of Freud’s triangle - the Chinese translation of

Accept the number of rows to print the reverse of Floyd’s Triangle
Print the values in the reverse order as specified in the reverse of Floyd’s Triangle

Example

is:

Example

/*Program to print the Reverse of Floyd's Triangle*/
#include<stdio.h>
int main() {
   int r,c=1;
   int rows,revrows,r1,c1,d;
   clrscr();
   printf("Enter number of rows to print the Floyd&#39;s Triangle: ");
   scanf("%d", &rows);
   printf("</p><p>");
   for (r=1;r<=(rows*(rows+1))/2;r++){
      printf("%d ",r);
      if(r==(c*(c+1))/2){
         printf("</p><p>");
         c++;
      }
   }
   printf("</p><p></p><p>");
   /*Printing the Reverse of Floyd&#39;s Triangle*/
   printf("Enter number of rows to print the reverse of Floyd&#39;s Triangle: ");
   scanf("%d",&revrows);
   printf("</p><p></p><p>");
   printf("Reverse of Floyd&#39;s Triangle</p><p>");
   printf("</p><p></p><p>");
   d = (revrows*(revrows+1))/2;
   for(r1=revrows;r1>=1;r1--){
      for(c1=r1;c1>=1;c1--,d--){
         printf("%4d", d);
      }
      printf("</p><p>");
   }
   getch();
   return 0;
}

Output

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