opengenus / calculator-in-java

Calculator console application in Java

Calculator Console Application

This is a simple calculator application that takes a mathematical expression as input and evaluates it. The application is written in Java and has two main files: main.java and helper.java.

main.java

This file contains the main function, which takes input from the user, calls the evaluate method from the Helper class, and prints the result.

helper.java

This file contains the methods evaluate, hasPrecedence, and applyOp.

evaluate(String input)

The evaluate method takes a string input and evaluates it as a mathematical expression using the Shunting Yard algorithm. It uses two stacks, one for operands and one for operators. The method converts the input string from infix notation to postfix notation and then evaluates it.

hasPrecedence(char op1, char op2)

The hasPrecedence method compares the precedence of two operators, op1 and op2. It returns true if op1 has higher or equal precedence than op2, and false otherwise. This method is used in the evaluate method to ensure that the operators are applied in the correct order.

applyOp(char op, double b, double a)

The applyOp method takes an operator, op, and two operands, a and b, and applies the operator to the operands. It returns the result of the operation. This method is used in the evaluate method to apply the operators to the operands.

How to Run

1. Clone the repository git clone https://github.com/OpenGenus/calculator-in-java.git
2. Open the project in your preferred IDE
3. Compile and run the main.java file
4. Input the mathematical expression you want to evaluate
5. The result will be displayed on the console

Note: The calculator only supports basic arithmetic operations such as addition, subtraction, multiplication, and division. It also supports the use of parentheses.

For the full explanation of the project, visit the link.