Help please

[alihajj95]

So thats the question:
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;
    while (C <= -273.15)
    {
    cout <<"ERROR: Temp must be >= -273.15: ";
    cin >> C;}
    {
        n = n--;
        cout << "Enter increments in degrees Celsius: ";
        cin >> n;
        
        
    }
    {
        a= 1; a++;
        F= C * 1.8+32;
        K= C + 273.15;
        R= C * 1.8+32+459.67;
    }
    {
        cout <<" #\t Cels\t Fahr\t Kelv\t Rank" <<endl;
        }
        cout <<" " << n << setw(4) << " " << C << setw(4) << " " << F
        << setw (6) << " " << K << setw (6) << " " << R << endl;
        
}

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 statment for increment


Thanks

[MiiNiPaa]

for loop:

for(int i - 1; i <= 20; ++i)
{
    std::cout << i << '\t' << Cels /*...*/;
    Cels += increment;
}

[alihajj95]

Thanks man