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string topostfix(string myString){
	char myChar[myString.length()];
	strcpy(myChar, myString.c_str());
	
	stack<char> s_op;
	string result = "";
	
	for(int i = 0; i < myString.length(); i++){
		
		if(myChar[i] != '*' && myChar[i] != '+' && myChar[i] != '-' && myChar[i] != '/' && myChar[i] != '(' && myChar[i] != ')'){
			cout << myChar[i]; // for step-by-step output
			result += myChar[i];
		}
		else if (myChar[i] == '(') {
			
			cout << myChar[i] << "\t\t"; 
			s_op.push(myChar[i]);
		}
		else if(myChar[i] == ')'){
				while(s_op.top() != '('){
					result += s_op.top();
					s_op.pop();
				}
			s_op.pop();	// pop the opening parenthesis
		}
			
		else{	// if char is an operator
			while(!s_op.empty() && precedence(s_op.top()) >= precedence(myChar[i])){
				result += s_op.top();
				s_op.pop();
				
			}
			cout  << myChar[i];
			s_op.push(myChar[i]);
			
		}
		cout << setw(40) << result << endl;
		
	}
	
	while(!s_op.empty()){
		result += s_op.top();
		s_op.pop();
		
	}
	
	return result;
}