Calculator Program in Java

A simple calculator program in Java programming language.

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Program Listing

Calc.java

class Calc {

public static void main (String[] args) {

try {

if (args.length == 0) {

System.out.println("\nPROGRAM ERROR: You didn't enter any arguments!");

} else if  (args.length < 3) {

System.out.println("\nPROGRAM ERROR: You passed fewer than 3 arguments.");

} else if (args.length > 3) {

System.out.println("\nPROGRAM ERROR: You passed more than 3 arguments.");

} else {

double a = Double.parseDouble(args[0]);
double b = Double.parseDouble(args[2]);
String op = args[1];

// Product variables
double p = a + b;
double s = a - b;
double m = a * b;
double d = a / b;

System.out.println("\n================");
System.out.println("WELCOME TO CALCACULATOR IN JAVA!");
System.out.println("================");
System.out.println("\nYou have entered: " + a + " " + op + " " + b);

switch (op) {

case "+" :
System.out.println("\n" + a + " " + op + " " + b + " = " + p);
break;

case "-" :
System.out.println("\n" + a + " " + op + " " + b + " = " + s);
break;

case "x" :
System.out.println("\n" + a + " " + op + " " + b + " = " + m);
break;

case "/" :
System.out.println("\n" + a + " " + op + " " + b + " = " + d);
break;

default :
System.out.println("INVALID OPERATOR SPECIFIED");

}
}

} catch (NumberFormatException e) {

System.out.println("\nPROGRAM ERROR");
System.out.println("\nFirst and third arguments must be numbers!");
System.out.println("\nEXAMPLE: 2 + 2");
System.out.println("\nERROR DETAILS: " + e);

} catch (Exception e) {

System.out.println("\nPROGRAM ERROR");
throw e;

}
}

}