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Console Based Java Calculator
This is a small Console Based Java Calculator that can add, subtract , divide and multiply two numbers. Find the square root of a number, cube of a number, nth Power of a number. It is very for the begnners of Java.
/*******************************************************
* MYCPLUS Sample Code - http://www.mycplus.com *
* *
* This code is made available as a service to our *
* visitors and is provided strictly for the *
* purpose of illustration. *
* *
* Please direct all inquiries to saqib at mycplus.com *
*******************************************************/
package calculator;
/**
* Title: Calculator
* Description: Calculator
* Copyright: Copyright (c) 2003
* Company: Nagina Computers
* @author Muhamnmad Saqib
* @version 1.0
*/
import java.io.*;
import java.math.*;
public class Calculator {
static double numAdd1=0,numAdd2=0;
static double numSub1=0,numSub2=0,numMul1=0;
static double numMul2=0,numDiv1=0,numDiv2=0;
static double numSqr1=0,numCube1=0,numPow1=0;
static double numPow2=0,numSqrt1=0;
static int choice;
static String myString;
//makes the full user interface at start up
public static int UI()throws Exception {
BufferedReader input = new BufferedReader(new InputStreamReader(System.in));
System.out.println("\n\n****************************\nWel Come to Java Language");
System.out.println(" CALCULATOR \n*****************************");
System.out.println("0:\tEXIT()");
System.out.println("1:\tAdd two Numbers");
System.out.println("2:\tSubtract two Numbers");
System.out.println("3:\tMultiply two Numbers");
System.out.println("4:\tDivide two Numbers");
System.out.println("5:\tSquare of a number");
System.out.println("6:\tCube of a number");
System.out.println("7:\tFind the SQUARE-ROOT of a Number");
System.out.println("8:\tFind the X power Y");
choice = Integer.parseInt(input.readLine());
return choice;
}
//Calculate the Addition of two numbers
public static double add(double numAdd1, double numAdd2){
return numAdd1 + numAdd2;
}
//Calculate the subtraction of two numbers
public static double sub(double numSub1, double numSub2){
return numSub1 - numSub2;
}
//Calculate the multiplication of two numbers
public static double multiply(double numMul1, double numMul2){
return numMul1 + numMul2;
}
//Calculate the Division of two numbers
public static double divide(double numDiv1, double numDiv2){
return numDiv1 / numDiv2;
}
//Calculate the Square of a numbers
public static double square(double numSqr1){
return numSqr1*numSqr1;
}
//Calculate the Cube of a numbers
public static double cube(double numCube1){
return numCube1 * numCube1 * numCube1;
}
//Calculate the SQUARE-ROOT of a numbers
public static double squareRoot(double numSqrt1){
return Math.sqrt(numSqrt1);
}
//Calculate the power of numbers
public static double power(double numpow1, double numPow2){
return Math.pow(numPow1,numPow2);
}
//press any key to Goto Main Menu
public static void mainMenu(){
System.out.print("Press Enter key.....");
try {
System.in.read();
}
catch(IOException e){
return;
}
}
//Function to check the input validation
public static boolean checkInput(String str){
int stringLength = str.length();
if (stringLength>=300){ return false;}
for (int i=0;i=9)
return false;
return true;
}
//main function
public static void main(String[] args)throws Exception {
boolean isValidInput;
BufferedReader input = new BufferedReader(new InputStreamReader(System.in));
choice= UI();
while (choice!=0){
switch(choice){
case 0:
return;
case 1:
//Add two numbers code Code
System.out.println("\nEnter First Number");
String str = input.readLine();
isValidInput = checkInput(str);
if(isValidInput==true){
numAdd1= Double.parseDouble(str);
}
else {System.out.println("\n****************\nInput ERROR\n************** ");}
System.out.println("\nEnter second Number");
str = input.readLine();
isValidInput = checkInput(str);
if(isValidInput==true){
numAdd2 = Double.parseDouble(str);
double numAddSum= add(numAdd1,numAdd2);
System.out.println("\n**********\nThe Sum is= " + numAddSum + "\n********** ");
}
else{System.out.println("\n****************\nInput ERROR\n************** ");}
mainMenu();
UI();
break;
case 2:
//Code
//subtract two numbers code Code
System.out.println("\nEnter First Number");
numSub1= Double.parseDouble(input.readLine());
System.out.println("\nEnter second Number");
numSub2 = Double.parseDouble(input.readLine());
double numSub = sub(numSub1,numSub2);
System.out.println("\n**********\nThe Difference is= " + numSub + "\n********** ");
mainMenu();
UI();
break;
case 3:
//Code
//subtract two numbers code Code
System.out.println("\nEnter First Number");
numMul1= Double.parseDouble(input.readLine());
System.out.println("\nEnter second Number");
numMul2 = Double.parseDouble(input.readLine());
double numMul = multiply(numMul1,numMul2);
System.out.println("\n**********\nThe Multiplication is= " + numMul + "\n********** ");
mainMenu();
UI();
break;
case 4:
//Code
//Divide two numbers code Code
System.out.println("\nEnter First Number");
numDiv1= Double.parseDouble(input.readLine());
System.out.println("\nEnter second Number");
numDiv2 = Double.parseDouble(input.readLine());
double numDiv = divide(numDiv1,numDiv2);
System.out.println("\n**********\nThe Division is= " + numDiv + "\n********** ");
mainMenu();
UI();
break;
case 5:
//Code
//square of a number code
System.out.println("\nEnter a Number");
numSqr1= Double.parseDouble(input.readLine());
double numSqr = square(numSqr1);
System.out.println("\n**********\nThe SQUARE is= " + numSqr + "\n********** ");
mainMenu();
UI();
break;
case 6:
//Code
//cube of a number code
System.out.println("\nEnter a Number");
numCube1= Double.parseDouble(input.readLine());
double numCube = cube(numCube1);
System.out.println("\n**********\nThe CUBE is= " + numCube + "\n********** ");
mainMenu();
UI();
break;
case 7:
//Code
//square-root of a numbver
System.out.println("\nEnter a Number");
numSqrt1= Double.parseDouble(input.readLine());
double numSqrt = squareRoot(numSqrt1);
System.out.println("\n**********\nThe SQUARE-ROOT is= " + numSqrt + "\n********** ");
mainMenu();
UI();
break;
case 8:
//Code
//Divide two numbers code Code
System.out.println("\nEnter a Number");
numPow1= Double.parseDouble(input.readLine());
System.out.println("\nEnter a 2nd Number");
numPow2= Double.parseDouble(input.readLine());
double numPow = power(numPow1,numPow2);
System.out.println("\n**********\nThe " + numPow1 + " power " + numPow2 + " is= " + numPow + "\n********** ");
mainMenu();
UI();
break;
default:
UI();
break;
}
}
}
}
Tags: Calculator, Java, Source Code
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