Basic Calculator Program Using Java
Last Updated :
22 May, 2023
Create a simple calculator which can perform basic arithmetic operations like addition, subtraction, multiplication, or division depending upon the user input.
Example:
Enter the numbers:
2
2
Enter the operator (+,-,*,/)
+
The final result:
2.0 + 2.0 = 4.0
Approach
- Take two numbers using the Scanner class. The switch case branching is used to execute a particular section.
- Using a switch case to evaluate respective operations.
Below is the Java program to implement the calculator:
Java
import java.io.*;
import java.lang.*;
import java.lang.Math;
import java.util.Scanner;
public class BasicCalculator {
public static void main(String[] args)
{
double num1, num2;
Scanner sc = new Scanner(System.in);
System.out.println( "Enter the numbers:" );
num1 = sc.nextDouble();
num2 = sc.nextDouble();
System.out.println( "Enter the operator (+,-,*,/):" );
char op = sc.next().charAt( 0 );
double o = 0 ;
switch (op) {
case '+' :
o = num1 + num2;
break ;
case '-' :
o = num1 - num2;
break ;
case '*' :
o = num1 * num2;
break ;
case '/' :
o = num1 / num2;
break ;
default :
System.out.println( "You enter wrong input" );
}
System.out.println( "The final result:" );
System.out.println();
System.out.println(num1 + " " + op + " " + num2
+ " = " + o);
}
}
|
Output:
Enter the numbers:
2
2
Enter the operator (+,-,*,/)
+
The final result:
2.0 + 2.0 = 4.0
Time Complexity: O(1)
Auxiliary Space: O(1)
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