Description

 A procedure for balancing chemical equations.

How to use it

syntax: See the main.cpp file.

#include <iostream>
#include <string>
#include <stdexcept>
#include "ChemicalEquaion.h"
int main()
{
	using namespace std;
	string s;
	while(cout << "equation: ",getline(cin,s))
	{
		try{
			cout << ChemicalEquaion::balance(s) << endl;
		}catch(const char *s){
			cout << s << endl;
		}catch(std::exception &e){
			cout << e.what() << endl;
		}
	}
	return 0;
}

input format

• All the chemical formula, +, =, should be separated by Spaces. Example: CO + O2 = CO2.
• Compound states [like (s) (aq) or (g)] are not required, if you input the states, the program will throw a exception, but you can modify this action by the code.
• To enter an ion specify charge after the compound in curly brackets: {+3} or {3+} or {3}. Example: Fe{3+} + I{-} = Fe{2+} + I2.
• You can use (, ), [, ] in the chemical formula.

What equation can it support

• Type 1: chemical equation Eg : NaBiO3 + MnSO4 + H2SO4 = Na2SO4 + Bi2(SO4)3 + NaMnO4 + H2O ans : 10NaBiO3 + 4MnSO4 + 14H2SO4 = 3Na2SO4 + 5Bi2(SO4)3 + 4NaMnO4 + 14H2O
• Type 2: ionic equation Eg : Fe(CN)6{4-} + MnO4{-} + H{+} = Mn{2+} + Fe{3+} + CO2 + NO3{-} + H2O ans : 5Fe(CN)6{4-}+61MnO4{-}+188H{+}=61Mn{2+}+5Fe{3+}+30CO2+30NO3{-}+94H2O
• Type 3: chemical equations with multiple balancing results Eg : Fe{2+} + Cl2 + Br{-} = Fe{3+} + Cl{-} + Br2 ans : (2x1 -2x2)Fe{2+} + (x1)Cl2 + (2x2)Br{-} = (2x1-2x2)Fe{3+} + (2x1)Cl{-} + (x2)Br2

unsupported types : Na2Sx + (3x+1)NaClO + (2x-2)NaOH = xNa2SO4 + (3x+1)NaCl + (x-1)H2O