#include<stdio.h>
int main()
{

    int i,j,max,k=1;

    printf("Enter the Maximum Number of Rows : ");
    scanf("%d",&max);

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

    return 0;
}

 OUTPUT:

Enter the Maximum Number of Rows : 10
FLOYD'S TRIANGLE up to 10 Rows:
 
 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