Here we can see a java program to create a basic calculator. When we compile this java program on java compiler then compiler take input from number form menu and after this we can calculate mathematical calculation.
package com.androidpro.in;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintStream;
import java.util.Scanner;
public class Main {
public static void main(String[] args)
{
int choice;
int x = 0;
int y = 0;
int sum;
PrintStream out;
Scanner input;
Main calc = new Main();
try
{
out = new PrintStream("calclog.txt");
do
{
System.out.println("Calculator
Program");
System.out.println("--------------------\n");
System.out.println("1.
Add");
System.out.println("2.
Subtract");
System.out.println("3.
Multiply");
System.out.println("4.
Divide");
System.out.println("5.
Mod");
System.out.println("6.
Power");
System.out.println("99. End
Program\n");
System.out.println("Enter
Choice: ");
input = new Scanner(System.in);
choice =
input.nextInt();
while ((choice < 1 || choice > 6) &&
choice != 99)
{
System.out.println("Please
enter 1, 2, 3, 4, 5, or 6: ");
choice =
input.nextInt();
}
if (choice != 99)
{
System.out.println("Please
enter 2 numbers only: ");
x = input.nextInt();
y =
input.nextInt();
}
switch (choice)
{
case 1:
sum = calc.add(x, y);
System.out.printf("The sum is
%d\n\n", sum);
out.println(x + "+" + y + "=" + sum);
break;
case 2:
sum = calc.sub(x, y);
System.out.printf("The answer
is %d\n\n", sum);
out.println(x + "-" + y + "=" + sum);
break;
case 3:
sum =
calc.multi(x, y);
System.out.printf("The answer
is %d\n\n", sum);
out.println(x + "*" + y + "=" + sum);
break;
case 4:
try
{
sum =
calc.div(x, y);
System.out.printf("The answer
is %d\n\n", sum);
out.println(x + "/" + y + "=" + sum);
}
catch (Exception e)
{
System.out
.println("\nError: Cannot
Divide by zero\n\n");
}
break;
case 5:
sum = calc.mod(x, y);
System.out.printf("The mod is
%d\n\n", sum);
out.println(x + "%" + y + "=" + sum);
break;
case 6:
sum = calc.pow(x, y);
System.out.printf("The answer
is %d\n\n", sum);
out.println(x + "^" + y + "=" + sum);
break;
}
}
while (choice != 99);
input.close();
System.out.println("Ending
program...");
}
catch (Exception e)
{
System.out.println("ERROR:
Some error occured");
e.printStackTrace();
}
}
public int add(int num1, int num2)
{
int sum;
sum = num1 +
num2;
return sum;
}
public int sub(int num1, int num2)
{
int sum;
sum = num1 -
num2;
return sum;
}
public int multi(int num1, int num2)
{
int sum;
sum = num1 *
num2;
return sum;
}
public int div(int num1, int num2)
{
int sum;
sum = num1 /
num2;
return sum;
}
public int mod(int num1, int num2)
{
int sum;
sum = num1 %
num2;
return sum;
}
public int pow(int base, int exp)
{
int sum = 1;
if (exp == 0)
{
sum = 1;
}
while (exp > 0)
{
sum = sum * base;
exp--;
}
return sum;
}
}
Output
Calculator Program
--------------------
1. Add
2. Subtract
3. Multiply
4. Divide
5. Mod
6. Power
99. End Program
Enter Choice:
4
Please enter 2 numbers only:
4
2
The answer is 2
Calculator Program
--------------------
1. Add
2. Subtract
3. Multiply
4. Divide
5. Mod
6. Power
99. End Program
Enter Choice:
99
Ending program...
