Anurag-Nagpal / Flex-Bison-Arithmetic-Calculator

Flex Bison Arithmetic Calculator

Flex - Flex is a tool that helps break the input into tokens.

Bison - Bison is a tool that helps build the parser using the tokens from the flex program

A C- program that takes an arithmetic expression and returns the calculated value using a parser.

Flex file will contain regular expressions that match the supported arithmetic operations (listed below) and the bison file will contain the grammar.

Operations supported on calculator

• Addition
• Subtraction
• Multiplication
• Division
• Logical left shift
• Arithmetic left shift
• Logical right shift
• Arithmetic right shift
• Exponents (eg. 2^3 = 8)

Windows

Initial Environment Setup

git clone https://github.com/Anurag-Nagpal/Flex-Bison-Arithmetic-Calculator.git
cd Flex-Bison-Arithmetic-Calculator

Build

make calc 

The make file contains the following commands

lexer.l parser.y
bison -d parser.y
flex lexer.l
gcc main.c lex.yy.c parser.tab.c -w
./a

Output