Thread: Multiple choice conditional

Is that not what you said you wanted before?
If not, then you need to specify exactly how you intend your program to work.

Right.
Well, look at your logic right now.
It's currently:

Code:

While user wants to input values
	Do you want to enter values? [Y/N]
	Ask for values
	Calculate
Loop

You probably want:

Code:

While user wants to input values
	Ask for values
	Calculate
	Do you want to enter values? [Y/N]
Loop

There are many ways to formulate logic. Another version might be:

Code:

While user wants to input values
    Do you want to enter values? [Y/N]
    If user wants to enter values
        Ask for values
        Calculate
Loop

Code:

#include <iostream>
using namespace std;

//Global Values are bad and you shouldn't use them
//I'm using them b/c it is easyer to help you understand what I've done.
const double mol = 1.0;
const double gas_const = 8.315;
double pres1;
double pres2;
double vol;
double temp;

//I have moved your caculation code to its own function to help clarifity your main loop.

void Calculate(){ //sorry for my spelling.
//Please note that one tab has been placed to denote your inside a function.
	cout << "\n Is the temperature in [K]elvin or [C]elsius?" << endl;
	char choice2;
	cin >> choice2;
	switch (choice2){
	//Please note that another tab has been added to denote the switch statement
		case 'k':
		case 'K':
		//And another tab has been added to show you have entered a logic sequence.
			cout << "\n Please enter the temperature (K)." << endl;
			cin >> temp;
			cout << "\n Please enter the volume (m^3)." << endl;
			cin >> vol;

			pres1 = (mol * gas_const * temp) / vol;

			cout << "\n One mole of gas at " << temp << "K, in a volume of " << vol << "m^3, has a pressure of " << pres1 << "J." << endl;
		//As you exit the logic sequence you subtract a tab space.
		break;
		case 'c':
		case 'C':
		//Added another tab for the logic sequence
			cout << "\n Please enter the temperature (C)." << endl;
			cin >> temp;
			cout << "\n Please enter the volume (m^3)." << endl;
			cin >> vol;

			pres2 = (mol * gas_const * (temp + 273)) / vol;

			cout << "\n One mole of gas at " << temp << "C, in a volume of " << vol << "m^3, has a pressure of " << pres2 << "J." << endl;
		//Deleted the tab as we exit this logic sequence.
		break;
	}
}


int main(){
    char choice1 = 0;  //Please remimber this line.
    while( choice1 != 'n'){
		cout << "\n Do you wish to enter a temperature and volume? ([Y]es or [N]o)" << endl;
		char choice1;  //Please look at line 53, this is why you can not exit your program.
		cin >> choice1;
		switch (choice1){
			case 'y':
			case 'Y':
				Calculate();	
			case 'n':
			case 'N':;
		}
	}
    cout << "Thank you for using my ideal gas pressure calculator." << endl;
}

Well done. That's great.