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11. Program to Create a Simple Calculator.
import java.util.Scanner;
import java.io.*;
class Calculator
{
public static void main(String[] args)
{
int choice;
int x = 0;
int y = 0;
int sum;
PrintStream out;
Scanner input;
Calculator calc = new Calculator();
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;
}
}
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