// Program untuk volume dan tekanan dari suatu gas.

/*  Programmer  : William Handi Wijaya      Tanggal diselesaikan : 21 November 2019
    NRP         : 05111940000087            Kelas                : Dasar Pemograman C */

#include <stdio.h>
#define a 3.592  //konstanta a van der walls
#define b 0.0427 //konstanta b van der walls
#define R 0.08206 //konstanta R

void print_table(double, double);
int main()
{
    //variable declaraations
    double volume_initial, // input - volume awal
           volume_final, // input - volume akhir
           volume_increment, // input - pertambahan volume untuk tabel
           kelvin_temp, // input - temperatur dalam kelvin
           moles, // input - besar mol unsur (co2)
           pressure; // tekanan
    //program intro
    printf("\nPlease enter at the prompts the number of moles of carbon dioxide, the absolute temperature, the initial volume in milliliters, the final volume, and the increment volume between lines of the table.");
    //get values
    printf("\nQuantity of carbon dioxide (moles)>");
    scanf("%lf", &moles);
    printf("\nTemperature (kelvin)>");
    scanf("%lf", &kelvin_temp);
    printf("\nInitial volume (milliliters)>");
    scanf("%lf", &volume_initial);
    printf("\nFinal volume (milliliters)>");
    scanf("%lf", &volume_final);
    printf("\nVolume increment (milliliters)>");
    scanf("%lf", &volume_increment);
    //displays the result
    printf("\nVolume (ml) %5c Pressure (atm)",' ');

    //loop for each case
    while(volume_initial <= volume_final)
    {
        pressure = ((moles*R *kelvin_temp) / (volume_initial/1000 - (b * moles))) - ((a * moles * moles) / volume_initial/1000 * volume_initial/1000);

        print_table(volume_initial, pressure);

        volume_initial += volume_increment;
    }
    printf("\n");
}

//printing functions
void print_table(double volume, double pressure)
{
    printf("\n%3c%.2f %10c %.4f",' ', volume, ' ', pressure);
}