Write a c program to print Floyd’s triangle.

/**********************************************************************  
1. How to print Floyd’s triangle in c
2. Write a c program to print Floyd’s triangle
3. C program to display Floyd’s triangle
 **********************************************************************/

#include<stdio.h>

int main(){

  int i,j,r,k=1;

  printf("Enter the number range: ");
  scanf("%d",&r);

  printf("FLOYD'S TRIANGLE\n\n");
  for(i=1;i<=r;i++){
      for(j=1;j<=i;j++,k++)
        printf(" %d",k);
      printf("\n");
    }

  return 0;
}

/*

OUTPUT:
Enter the number range: 11
FLOYD'S TRIANGLE

 1
 2 3
 4 5 6
 7 8 9 10
 11 12 13 14 15
 16 17 18 19 20 21
 22 23 24 25 26 27 28
 29 30 31 32 33 34 35 36
 37 38 39 40 41 42 43 44 45
 46 47 48 49 50 51 52 53 54 55
 56 57 58 59 60 61 62 63 64 65 66

*/

Floyd’s triangle is a right-angled triangular 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 a 1 in the top left corner:

1
2 3
4 5 6
7 8 9 10
11 12 13 14 15