Program Specication: Write a Java program that emulates a simple calculator: Pro

Question

Program Specication:

Write a Java program that emulates a simple calculator:

Prompts the user to input the left operand and read it into a double variable.

Prompts the user to input the right operand and read it into a double variable.

Display a menu which gives the user the choice of the following menu options:

1 -> Multiplication

2 -> Division

3 -> Addition

4 -> Subtraction

and uses a user validation loop to read their response into a String variable.

Note: You must repeatedly get the users response until it is exactly one of the characters 1 2 3 4

Compute the result of the arithmetic expression, based on the operands and operator provided, and

display the entire expression with its result.

Grading:

Performance Indicator [1] [2] [3]

Readability and documentation 1 2 2

Use of loop(s) operators 1 2 2

Functional requirements 2 3 4

Eciency 1 2 2

Sample run(s):

---------------------------------------------

Enter the left operand : 1.2

Enter the right operand : 3.4

---------------------------------------------

1 -> Multiplication

2 -> Division

3 -> Addition

4 -> Subtraction--------------------------------------------

Choose an operator from the above menu : p

Choose an operator from the above menu : 7

Choose an operator from the above menu : 1

---------------------------------------------

1.2 * 3.4 = 4.08

---------------------------------------------

Explanation / Answer

import java.util.Scanner;

public class Calculator{

public static void main(String []args){

Scanner ss = new Scanner(System.in);

String op[] = {"*","/","+","-"};

System.out.println("Enter the left operand");

double l = ss.nextDouble();

System.out.println("Enter the right operand");

double r = ss.nextDouble();

System.out.println("1 -> Multiplication 2 -> Division 3 -> Addition 4 -> Subtraction");

System.out.print("Choose an operator from the above menu :");

int re = ss.nextInt();

while(re<1 || re>4){

System.out.print("Choose an operator from the above menu :");

re = ss.nextInt();

}

double res=0.0;

if(re==1) res = l*r;

else if(re==2){

res = l/r;

}

else if(re==3) res = l+r;

else if(re==4) res = l-r;

System.out.println(l+""+op[re-1]+""+r+" = "+(res));

}

}

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