Program to generate Floyd's triangle

Program:

#include<stdio.h>
#include<conio.h>
void main()
{
    int r, i, j, c = 1;
    clrscr();
    printf("Enter the number of rows : ");
    scanf("%d", &r) ;
    printf("\nFloyd's triangle is : \n\n");
    for(i = 0 ; i < r ; i++)
    {
        for(j = 0 ; j <= i ; j++)
        {
            printf("%-6d", c);
            c++;
        }
        printf("\n\n");
    }
    getch();
}

Output:

Enter the number of rows : 5
Floyd's triangle is :
1
2 3
4 5 6
7 8 9 10
11 12 13 14 15