import java.io.*; 	// This line allows us to use commands to read from the command line

public class Operator {		// Name of the file

	public static void main(String[] args) throws IOException {		// Main program start
		BufferedReader stdIn = new BufferedReader( 		// These lines allow us to read from the command line
												new InputStreamReader( System.in ) );
		int x;	// These lines tell java what variables we need to use
		int y;
		float result;
		String operator;
		String yesOrNo;
		
		do{		// This loop will always execute as long as the user does not enter "n" at the end
			System.out.print( "Enter the first number: " );
			x = Integer.parseInt( stdIn.readLine() );		// Gets a number from the console and turns it
																				// into an integer
			
			System.out.print( "Enter the second number: " );
			y = Integer.parseInt( stdIn.readLine() );
			
			System.out.print( "What operation do you want to do? ( + , - , * , / ) " );
			operator = stdIn.readLine();						// User enters what operation they want to use
			
			if( operator.compareTo( "+" )  == 0 )			// If user wants to add, then add x and y
				result = x + y;
			else if( operator.compareTo( "-" ) == 0 )	// If user wants to subtract, then subtract x and y
				result = x - y;
			else if( operator.compareTo( "*" ) == 0 )	// If user wants to multiply, then multiply x and y
				result = x * y;
			else if( operator.compareTo( "/" ) == 0 )	// If user wants to divide, then divide x and y
				result = ( float )x / ( float )y;	// This one tells java not to round answers and instead use floating point
			else{		// If no valid operator was entered, the following message is displayed
				System.out.println( "Not a valid operator, try again" );
				break;	// Breaks the loop and ends the program
			}
			
			System.out.println( x + " " + operator + " " + y + " = " + result );	// Tells java to output the result
			System.out.println();	// Blank line
			
			System.out.print( "Would you like to add two more numbers? (y/n) " );
			yesOrNo = stdIn.readLine();	// Get the answer from console
			if( yesOrNo.compareToIgnoreCase( "n" )  == 0 )		// If the answer was "n" then we exit the program
				System.exit( 0 );
		}
		while( true );	// Goes back to the beginning of the "do" loop if the person did not enter "n" to stop the program
	}
}