//The imports below are for I/O 
import java.util.*;
import java.io.*; 

// Declare a public class
public class Homework4 { 
	
		static int doIntMath(char op,int numa, int numb){
		int return_val0;
		return_val0 = 0;
		switch (op)	
		
		//These switch statements determines what input the user enters and computes it.
		{
		case '+': 
		return_val0 = numa + numb;
		break;
		
		case '-': 
		return_val0 = numa - numb;
		break;
		
		case '*': 
		return_val0 = numa * numb;
		break;
		
		case '/': 
		return_val0 = numa / numb;
		break;
		
		case '%': 
		return_val0 = numa + numb;
		break;
		
		//if the user enters an exponent expression the exponent method will handle the input.
		case '^':
		return_val0 = exponent(numa, numb);
		break;
		
		//Declare a default statement if the user enters a invalid expression and return number to 0
		default:
		return_val0 = 0;
		System.out.println("You have entered an Invalid Operation");
		}
		
		return return_val0;
		
}

	//Make method to do double expressions
	static double doDoubleMath(char op,double numa, double numb){
		double return_val;
		return_val = 0;
		switch (op)	
		
		//These switch statements determines what input the user enters and computes it.
		{
		case '+': 
		return_val = numa + numb;
		break;
		
		case '-': 
		return_val = numa - numb;
		break;
		
		case '*': 
		return_val = numa * numb;
		break;
		
		case '/': 
		return_val = numa / numb;
		break;
		
		//Declare a default statement if the user enters a invalid expression and return number to 0
		default:
		return_val = 0;
		System.out.println("You have entered an Invalid Operation");
		}
		
		return return_val;
		
}
//Make the exponent method
	static int exponent(int a, int b){
		int return_val = 1;	
		
		//This method will handle an exponent expression
		if (b < 0) 
		{
		System.out.println("Error: Exponent Must Be >=0");
		return_val = 1;
		}
		
		else if (b == 0) 
		{
		return_val = 1;
		}
		
		else if (b == 1) 
		{
		return_val = a;
		}
		
		else 
		{
		return_val = a * exponent (a, b-1);
		}
		return (return_val);
		}	

	//Declare main
	public static void main (String[] args){
	
	//Declare variables
	int inta, intb;
	char option0, charop;
	double intc, intd;
	String userinput0, op0, op1;
	
	
	//Create scanner
	Scanner sc = new Scanner(System.in);
	
	System.out.println("1) Do Integer Expression");
	System.out.println("2) Do Floating Point Expression");
	System.out.println("3) Show integer Answers");
	System.out.println("4) Show Floating Point Answers");
	System.out.println("5) End Program");
	System.out.println("Selection:");
	
	userinput0 = sc.next();
	option0 = userinput0.charAt(0);
	
	if (option0 == '1')
	{
	System.out.println("Enter An Integer Expression");
	
	inta = sc.nextInt();
	op0 = sc.next();
	charop = op0.charAt(0);
	intb = sc.nextInt();
	
	System.out.println(inta + op0 + intb + "=" +doIntMath(charop, inta, intb));
	}
	
	else if (option0 == '2')
	{
	System.out.println("Enter a floating point expression");
	
	intc = sc.nextDouble();
	op1 = sc.next();
	charop = op1.charAt(0);
	intd = sc.nextDouble();
	
	System.out.println(intc + op1 + intd + "="+doDoubleMath(charop, intc, intd));
	}	
	

	
}
}

do
{
   // display the choices
   
   // get the input

   // option 1 check

   // option 2 check

   // more option checks as needed

}while ( option0 != '5' );