C++ :: Program That Create And Display Table Of Temperature Conversions

Write a program that creates and displays a table of temperature conversions. Get the starting temperature from the keyboard in degrees Celsius (do not allow input of a value below absolute zero). Also get an integer value to represent the number of degrees to increment for each of a 20 row table (do not allow the increment value to be less than one. The first column will be a row number starting with one, follow by the Celsius value and then the conversions into Fahrenheit, Kelvin, and Rankine. Be sure that all columns are neatly right aligned for a variety of inputs.

Thats what i wrote so far:

#include <iostream>
#include <iomanip>
using namespace std;
int main() {
double C,F,K,R,n,a;
cout <<"Enter starting temperature in Celsius: ";
cin >> C;
[Code] ....

Thats what the instructor looking for:

Enter starting temperature in Celsius: -500
ERROR: Temp must be >= -273.15: -273.15
Enter increments in degrees Celsius: 100

# Cels Fahr Kelv Rank
1 -273.15 -459.67 0.00 0.00
2 -173.15 -279.67 100.00 180.00
3 -73.15 -99.67 200.00 360.00
4 26.85 80.33 300.00 540.00
5 126.85 260.33 400.00 720.00
6 226.85 440.33 500.00 900.00
7 326.85 620.33 600.00 1080.00
8 426.85 800.33 700.00 1260.00
9 526.85 980.33 800.00 1440.00
10 626.85 1160.33 900.00 1620.00
11 726.85 1340.33 1000.00 1800.00
12 826.85 1520.33 1100.00 1980.00
13 926.85 1700.33 1200.00 2160.00
14 1026.85 1880.33 1300.00 2340.00
15 1126.85 2060.33 1400.00 2520.00
16 1226.85 2240.33 1500.00 2700.00
17 1326.85 2420.33 1600.00 2880.00
18 1426.85 2600.33 1700.00 3060.00
19 1526.85 2780.33 1800.00 3240.00
20 1626.85 2960.33 1900.00 3420.00
Press any key to continue . . .

My question is to know how to make the sequence from 1 to 20 and whats the best statement for increment...