The Ring programming language version 1.5.1 book - Part 15 of 180
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This document provides an overview of using the Ring Notepad application to write and run Ring programs. It describes the main Ring Notepad windows used for writing code, viewing documentation, and output. It then provides examples for creating and running a simple console application that prints "Hello, World!", a GUI application with a window using RingQt, and instructions for creating web applications with Ring (requiring web server support).
The Ring programming language version 1.5.1 book - Part 15 of 180
- 1. Ring Documentation, Release 1.5.1 Note: nl value means a new line and the actual codes that represent a newline is different between operating systems See "Hello" + nl + "Welcome to the Ring programming language" + nl + "How are you?" 11.5 Getting Input You can get the input from the user using the give command See "What is your name? " Give cName See "Hello " + cName 11.6 No Explicit End For Statements You don’t need to use ‘;’ or press ENTER to separate statements. The previous program can be written in one line. See "What is your name? " give cName see "Hello " + cName 11.7 Writing Comments We can write one line comments and multi-line comments The comment starts with # or // Multi-lines comments are written between /* and */ /* Program Name : My first program using Ring Date : 2016.09.09 Author : Mahmoud Fayed */ See "What is your name? " # print message on screen give cName # get input from the user see "Hello " + cName # say hello! // See "Bye!" Note: Using // to comment a lines of code is just a code style. 11.5. Getting Input 115
- 2. CHAPTER TWELVE GETTING STARTED - SECOND STYLE 12.1 Hello World The next program prints the Hello World message on the screen (std-out). put "Hello World" 12.2 Run the program to run the program, save the code in a file, for example : hello.ring then from the command line or terminal, run it using the ring interpreter ring hello.ring 12.3 Not Case-Sensitive Since the Ring language is not case-sensitive, the same program can be written in different styles Tip: It’s better to select one style and use it in all of the program source code PUT "Hello World" Put "Hello World" 12.4 Multi-Line literals Using Ring we can write multi-line literal, see the next example Put " Hello Welcome to the Ring programming language How are you? " Also you can use the nl constant to insert new line and you can use the + operator to concatenate strings 116
- 3. Ring Documentation, Release 1.5.1 Note: nl value means a new line and the actual codes that represent a newline is different between operating systems Put "Hello" + nl + "Welcome to the Ring programming language" + nl + "How are you?" 12.5 Getting Input You can get the input from the user using the get command Put "What is your name? " Get cName Put "Hello " + cName 12.6 No Explicit End For Statements You don’t need to use ‘;’ or press ENTER to separate statements. The previous program can be written in one line. Put "What is your name? " get cName put "Hello " + cName 12.7 Writing Comments We can write one line comments and multi-line comments The comment starts with # or // Multi-lines comments are written between /* and */ /* Program Name : My first program using Ring Date : 2016.09.09 Author : Mahmoud Fayed */ Put "What is your name? " # print message on screen get cName # get input from the user put "Hello " + cName # say hello! // Put "Bye!" Note: Using // to comment a lines of code is just a code style. 12.5. Getting Input 117
- 4. CHAPTER THIRTEEN GETTING STARTED - THIRD STYLE 13.1 Hello World The next program prints the Hello World message on the screen (std-out). load "stdlib.ring" print("Hello World") 13.2 Run the program to run the program, save the code in a file, for example : hello.ring then from the command line or terminal, run it using the ring interpreter ring hello.ring 13.3 Not Case-Sensitive Since the Ring language is not case-sensitive, the same program can be written in different styles Tip: It’s better to select one style and use it in all of the program source code LOAD "stdlib.ring" PRINT("Hello World") Load "stdlib.ring" Print("Hello World") 13.4 Multi-Line literals Using Ring we can write multi-line literal, see the next example Load "stdlib.ring" Print(" Hello Welcome to the Ring programming language How are you? 118
- 5. Ring Documentation, Release 1.5.1 ") Also you can use the n to insert new line and you can use #{variable_name} to insert variables values. Load "stdlib.ring" Print( "HellonWelcome to the Ring programming languagenHow are you?") 13.5 Getting Input You can get the input from the user using the getstring() function Load "stdlib.ring" Print("What is your name? ") cName = GetString() Print("Hello #{cName}") 13.6 No Explicit End For Statements You don’t need to use ‘;’ or press ENTER to separate statements. The previous program can be written in one line. Load "stdlib.ring" Print("What is your name? ") cName=getstring() print("Hello #{cName}") 13.7 Writing Comments We can write one line comments and multi-line comments The comment starts with # or // Multi-lines comments are written between /* and */ /* Program Name : My first program using Ring Date : 2016.09.09 Author : Mahmoud Fayed */ Load "stdlib.ring" Print("What is your name? ") # print message on screen cName=GetString() # get input from the user print("Hello #{cName}") # say hello! // print("Bye!") Note: Using // to comment a lines of code is just a code style. 13.5. Getting Input 119
- 6. CHAPTER FOURTEEN USING RING NOTEPAD In this chapter we will learn about using Ring Notepad to write and execute Ring programs quickly Ring Notepad is just a simple application developed using the Ring language. 14.1 Ring Notepad - Main Window When we run the Ring Notepad we get the next dockable windows • Project Files Window : where we can select and open any ring file (*.ring) quickly. • Source Code Window : Where we write the source code. • Form Designer Window : The Form Designer to create GUI application forms. • Web Browser Window : Where we read the documentation or quickly open any website. • Output Window : Output when we run programs that print to the standard output • Function Window : List of functions in the current source file • Classes Window : List of classes in the current source file 120
- 7. Ring Documentation, Release 1.5.1 14.2 Creating and running your first Console Application At first we will type the source code See "Hello, World!" As in the next image Then we will click on the “Save” button from the toolbar (or press CTRL+S) Determine the source code file name and location. For example type : hello This will create a new source code file called : hello.ring 14.2. Creating and running your first Console Application 121
- 8. Ring Documentation, Release 1.5.1 To run the program click on “Debug (Run then wait!)” button from the toolbar The next screen shot present the application during the runtime Press Enter to continue and return to the Ring Notepad. 14.2. Creating and running your first Console Application 122
- 9. Ring Documentation, Release 1.5.1 14.3 Creating and running your first GUI/Mobile Application To learn how to create GUI applications using Ring check the “Desktop and Mobile development using RingQt” chapter. Source Code: Load "guilib.ring" New qApp { new qWidget() { resize(400,400) setWindowTitle("Hello, World!") show() } exec() } In Ring notepad we have a special button to run GUI applications without displaying the console window. 14.3. Creating and running your first GUI/Mobile Application 123
- 10. Ring Documentation, Release 1.5.1 The next screen shot present the application during the runtime 14.4 Creating and running your first Web Application To learn how support Ring in your web server and how to create web applications using Ring check the “Web Devel- opment (CGI Library)” chapter. Note: You need to support the Ring language in your web server to be able to run the next example. Source Code: 14.4. Creating and running your first Web Application 124