# How to Create Basic Calculator using Java

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This tutorial will teach you how to create a basic calculator using if statement in Java. This calculator can calculate using the four operations of mathematics.

I am using “if Statement” to identify what operation should use in calculating two numbers. And also a “Boolean” condition if statement, it means that only two results of the condition should display if it is the condition is true or false. I am also using a “Scanner” Function so that the user can input the values when the program is running. Please follow all the steps to complete this tutorial.

### Basic Calculator Using If Statements Steps

1. Create a new project. 2. Go to your source view and insert the code below above your class.

[java]import java.util.Scanner;[/java]

3. Inside your main method, declare five variables. Your code should look like below.

[java]Scanner input = new Scanner(System.in);
int num1=0,num2=0,total=0;
String op=””;[/java]

Input – scanner variable

Num1 – handle the first value

Num2 – handle the second value

Total – display the result

Op – handle the input operation

4. Insert the statement below after step 3. This statement will ask the user input of first value, the second value, and operation.

[java]System.out.print(“Enter first value: “);
num1 = input.nextInt();
System.out.print(“Enter second value: “);
num2 = input.nextInt();
System.out.print(“Enter operation: “);
op = input.next();[/java]

5. Insert the statement below after step 4. The following statement will execute the algorithm and display the result.

[java]if (op.equals(“a”)){
total = num1 + num2;
System.out.println(“The sum is ” + total);
}else if(op.equals(“s”)){
total = num1 – num2;
System.out.println(“The difference is ” + total);
}else if(op.equals(“m”)){
total = num1 * num2;
System.out.println(“The product is ” + total);
}else if(op.equals(“d”)){
total = num1 / num2;
System.out.println(“The quotient is ” + total);
}else{
System.out.println(“Wrong operation!”);
}[/java]

6. Run your program and the result should look like the image below. 7. Complete Source Code.

[java]import java.util.Scanner;
public class BasicCalculator {
public static void main(String args[]){
//declaring variables
Scanner input = new Scanner(System.in);
int num1=0,num2=0,total=0;
String op=””;
//initializing the variables
System.out.print(“Enter first value: “);
num1 = input.nextInt();
System.out.print(“Enter second value: “);
num2 = input.nextInt();
System.out.print(“Enter operation: “);
op = input.next();
//runing the algo and display result
if (op.equals(“a”)){
total = num1 + num2;
System.out.println(“The sum is ” + total);
}else if(op.equals(“s”)){
total = num1 – num2;
System.out.println(“The difference is ” + total);
}else if(op.equals(“m”)){
total = num1 * num2;
System.out.println(“The product is ” + total);
}else if(op.equals(“d”)){
total = num1 / num2;
System.out.println(“The quotient is ” + total);
}else{
System.out.println(“Wrong operation!”);
}
}
}[/java]

REMEMBER:
Operation “a” for addition, “s” for subtraction, “m” for multiplication, “d” for division. If you input operation in another format, the program will display message “Wrong operation”.

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