Thread: Chemistry Problem In C++ Script Not WORKING

O.K. I'm very very new to C++ but I am trying to make a programm that can do PV=nRT and for whatever you put 0 in for it solves the equation out. But when I was trying to test if I could get even one of the variables solved I came into a problem, it's not giving me the right answer XD.
Here is my script

Code:

#include <iostream>

using namespace std;


int main()
{
    int P;
    float V;
    float r;
    float n;
    float temp;
    float answer;
    
    cout<<"Please enter value for Pressure in kPa \n";
    cin>> P;
    cin.ignore ();
    cout<<"Please enter value for Volume in L \n";
    cin>> V;
    cin.ignore ();
    cout<<"Please enter value for n in moles \n";
    cin>> n;
    cin.ignore ();
    cout<<"Please enter value for Temperature in Celsius \n";
    cin>> temp;
    cin.ignore ();
    r = 8.31; 

if ( P = 0 ) { answer = n * r * temp / V; }
cout<<answer; 
cin.ignore();
cin.get ();
}

well actually no i havent made it to add the 273 to the temp yet because i was trying just to get this small part of it to work

Code:

if ( P = 0 ) { answer = n * r * temp / V; }

Use the "==" operator instead of the "=" operator. That way, the calculation will perform (since "P = 0" evaluates to 0, you never actually do the calculation).

Thank you so much foxman. That worked WOOT. You rock man.