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Home » Language IDEs » Java Development Tools (JDT) » I need help making a calculator in java(I am a beginner in java programming and i currently am making a calculator in java. i use eclipse.)

I need help making a calculator in java [message #1070438]

Wed, 17 July 2013 21:00

Eclipse User

hi, i am trying to use the Scanner tool to scan these symbols : *, /, -, +

my code:

this is the part that is used for integers:

import java.util.Scanner;
class CalculatorInt {
public static void main(String args[]) {
int FirstNumber;
double Sign;
int SecondNumber;
Scanner myScanner = new Scanner(System.in);
FirstNumber = myScanner.nextInt();
Sign = myScanner.next {
if (Sign = *) {
SecondNumber = myScanner.nextInt();
System.out.println("calculating");
System.out.println("calculating");
}else{
Sign = myScanner.next {
if (Sign = /) {
SecondNumber = myScanner.nextInt();
System.out.println("calculating");
System.out.println("calculating");
}else{
Sign = myScanner.next {
if (Sign = -) {
SecondNumber = myScanner.nextInt();
System.out.println("calculating");
System.out.println("calculating");
}else{
Sign = myScanner.next {
if (Sign = +) {
SecondNumber = myScanner.nextInt();
System.out.println("calculating");
System.out.println("calculating");
}
}
}
}
}
}
}
}
}
}

this is the part used for numbers with decimals:

import java.util.Scanner;
class CalculatorInt {
public static void main(String args[]) {
double FirstNumber;
double Sign;
double SecondNumber;
Scanner myScanner = new Scanner(System.in);
FirstNumber = myScanner.nextInt();
Sign = myScanner.next {
if (Sign = *) {
SecondNumber = myScanner.nextInt();
System.out.println("calculating");
System.out.println("calculating");
}else{
Sign = myScanner.next {
if (Sign = /) {
SecondNumber = myScanner.nextInt();
System.out.println("calculating");
System.out.println("calculating");
}else{
Sign = myScanner.next {
if (Sign = -) {
SecondNumber = myScanner.nextInt();
System.out.println("calculating");
System.out.println("calculating");
}else{
Sign = myScanner.next {
if (Sign = +) {
SecondNumber = myScanner.nextInt();
System.out.println("calculating");
System.out.println("calculating");
}
}
}
}
}
}
}
}
}
}
the 2 file attachments are the java code in java. the CalculatorInt.class is for the integers and the CalculatorDouble.class is for the numbers with decimals. Please tell me how to fix my code to make the scan work.

Attachment: CalculatorInt.class
(Size: 0.99KB, Downloaded 384 times)
Attachment: CalculatorDouble.class
(Size: 1.88KB, Downloaded 540 times)

Re: I need help making a calculator in java [message #1070656 is a reply to message #1070438]

Thu, 18 July 2013 08:05

Eclipse User

Two comments: don't post compiled class files and expect people to run them on their machines.

Second: use the compiler's error messages to detect the errors in your program and fix them before wondering why the code doesn't work.

Re: I need help making a calculator in java [message #1752113 is a reply to message #1070438]

Wed, 18 January 2017 20:07

Eclipse User

this is how to make a calculator:

package temporaryCaluclator;

import java.util.Scanner;

public class Calculator1000 {
public static void main(String[] args) {

Scanner input = new Scanner(System.in);
System.out.println("Enter Equasion Here:");
while (true) {
int value = input.nextInt();
String text = input.next();
switch (text) {
case "+":
int value2 = input.nextInt();
int add = value + value2;
System.out.println(add);
break;
case "-":
value2 = input.nextInt();
add = value - value2;
System.out.println(add);
break;
}

}
}
}

paste this into eclipse and you will have a simple calculator! but remember to rename your class and package to the name of your own ones

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