# prasad0876/calculator architecture

> Architecture diagram of the GitHub repository prasad0876/calculator, generated by GitDiagram from its file tree, README and a sample of source files (last updated 2026-09-25). It is an AI-made overview: check details against the source.

- Interactive diagram: https://gitdiagram.com/prasad0876/calculator
- Repository: https://github.com/prasad0876/calculator

## Overview

This is a browser-based calculator. Users enter expressions with on-screen buttons or the keyboard, then calculate a result; the interface also supports clearing, deleting, percentage and decimal input, and displays invalid-expression errors. The README documents responsive desktop and mobile design. The source shows the interaction and calculation logic, but the HTML and CSS contents were not sampled, so their specific structure and styling details are not represented.

Main entry points: [`script.js`](https://github.com/prasad0876/calculator/blob/main/script.js) (Input handling), [`index.html`](https://github.com/prasad0876/calculator/blob/main/index.html) (Calculator UI), [`style.css`](https://github.com/prasad0876/calculator/blob/main/style.css) (Responsive styling)

## Diagram (Mermaid)

```mermaid
flowchart TD

subgraph group_interface["Calculator interface"]
  node_interface["Calculator UI<br/>[index.html]"]
  node_result["Display and history<br/>[index.html]"]
end

subgraph group_logic["Calculator logic"]
  node_controller["Input handling<br/>[script.js]"]
  node_expression["Expression entry<br/>[script.js]"]
  node_calculation["Calculation and errors<br/>[script.js]"]
end

subgraph group_presentation["Visual presentation"]
  node_styling["Responsive styling<br/>[style.css]"]
end

node_user(("User"))

node_user -->|"uses buttons"| node_interface
node_user -->|"presses keys"| node_controller
node_interface -->|"dispatches clicks"| node_controller
node_controller -->|"appends input"| node_expression
node_controller -->|"requests calculation"| node_calculation
node_expression -->|"updates display"| node_result
node_calculation -->|"writes result or error"| node_result
node_styling -->|"styles layout"| node_interface

click node_interface "https://github.com/prasad0876/calculator/blob/main/index.html"
click node_controller "https://github.com/prasad0876/calculator/blob/main/script.js"
click node_expression "https://github.com/prasad0876/calculator/blob/main/script.js"
click node_calculation "https://github.com/prasad0876/calculator/blob/main/script.js"
click node_result "https://github.com/prasad0876/calculator/blob/main/index.html"
click node_styling "https://github.com/prasad0876/calculator/blob/main/style.css"

classDef toneNeutral fill:#f8fafc,stroke:#334155,stroke-width:1.5px,color:#0f172a
classDef toneBlue fill:#dbeafe,stroke:#2563eb,stroke-width:1.5px,color:#172554
classDef toneAmber fill:#fef3c7,stroke:#d97706,stroke-width:1.5px,color:#78350f
classDef toneMint fill:#dcfce7,stroke:#16a34a,stroke-width:1.5px,color:#14532d
classDef toneRose fill:#ffe4e6,stroke:#e11d48,stroke-width:1.5px,color:#881337
classDef toneIndigo fill:#e0e7ff,stroke:#4f46e5,stroke-width:1.5px,color:#312e81
classDef toneTeal fill:#ccfbf1,stroke:#0f766e,stroke-width:1.5px,color:#134e4a
class node_interface,node_result,node_user toneBlue
class node_controller,node_expression,node_calculation toneAmber
class node_styling toneMint
```

## Components

### Calculator interface

- [Calculator UI](https://github.com/prasad0876/calculator/blob/main/index.html): `index.html`
- [Display and history](https://github.com/prasad0876/calculator/blob/main/index.html): `index.html`

### Calculator logic

- [Input handling](https://github.com/prasad0876/calculator/blob/main/script.js): `script.js`
- [Expression entry](https://github.com/prasad0876/calculator/blob/main/script.js): `script.js`
- [Calculation and errors](https://github.com/prasad0876/calculator/blob/main/script.js): `script.js`

### Visual presentation

- [Responsive styling](https://github.com/prasad0876/calculator/blob/main/style.css): `style.css`

### Other components

- **User**

## Connections

- User → Calculator UI: uses buttons
- User → Input handling: presses keys
- Calculator UI → Input handling: dispatches clicks
- Input handling → Expression entry: appends input
- Input handling → Calculation and errors: requests calculation
- Expression entry → Display and history: updates display
- Calculation and errors → Display and history: writes result or error
- Responsive styling → Calculator UI: styles layout