#include <stdio.h>
// Floyd's triangle is a right-angled triangular of natural numbers
int main(int argc, char **argv)
{
int i, j, rows = 7, n = 1;
for (i = 1; i <= rows; i++)
{
for (j = 1; j <= i; j++, n++)
printf("%d ",n);
printf("\n");
}
return(0);
}
/*
run:
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
*/