calculator-in-c's Introduction

Calculator in C

About

Basic calculator in C that operates on integer operands based on user input.

Includes functions for simple operations (i.e., addition, subtraction, multiplication, and division).
Error handles invalid inputs (e.g., non-numeric, divide-by-0).
Accepts user input for operands and operation.

Note: Repository includes C and assembly source files.

How to Run C Code

// First command generates executable.
// Second command runs executable.
gcc calculator.c -o calculator.o
./calculator.o

How to Run Assembly Code

Extended ASM (current)

// Converts to extended assembly syntax using GCC (current).
//
// First command disassembles C into extended assembly syntax with GCC. 
// Second command generates executable.
// Third command runs executable.
//
// **NOTE: for syntax @see https://www.felixcloutier.com/documents/gcc-asm.html
// **NOTE: for -pie @see https://stackoverflow.com/a/30426603/22279004
// **NOTE: -S disassembles C code into extended assembly syntax (does not support nasm, masm, fasm, tasm)

gcc -S calculator.c -o calculator.s
gcc -o calculator calculator.s -pie
./calculator

NASM (deprecated)

// Compiles and executes assembly in NASM syntax (deprecated).
//
// First command assembles NASM (Netwide Assembler).
// Second command generates executable.
// Third command runs executable.
//
// ** NOTE: -felf64 specifies the output format as ELF64 (Executable and Linkable Format for 64-bit architectures).

nasm -felf64 Calculator2.asm
ld Calculator2.o -o Calculator2
./Calculator2

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