Floyd triangle

#include <stdio.h>
int main()
{
  int n, i,  c, a = 1;
   printf("Enter the number of rows of Floyd's triangle to print:\n");
  scanf("%d", &n);
   for (i = 1; i <= n; i++)
  {    for (c = 1; c <= i; c++)
    {      printf("%d ",a);
      a++;
    }
    printf("\n");
  }
   return 0;
}

Output:
Enter the number of rows of Floyd's triangle to print:3
1
2 3
4 5 6