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In some languages, particularly scripting languages, the "Hello, World!" program can be written as one statement, while in others (more so many low-level languages) many more statements can be required. For example, in Python, to print the string Hello, World! followed by a newline, one only needs to write print ("Hello, World!").
The standard "Hello, World!" program: The idea is to generate the ASCII values for each character of the string and print it using the "Speak your mind" command. For instance, the first line of dialog said by Hamlet uses a combination of arithmetic operations to assign the decimal value 72 (binary 1001000) to the other protagonist Romeo, which ...
This script defines a task greet in Bash which prepends "Hello "to its string argument person. The function produces a record with a single string field out. Applying greet, binding the argument person to the string "world" produces the record <out = "Hello world">. Projecting this record to its field out evaluates the string "Hello world".
Here is the entire "Hello, World!" program in Turing with syntax highlighting: put "Hello World!" Turing avoids semicolons and braces, using explicit end markers for most language constructs instead, and allows declarations anywhere. Here is a complete program defining and using the traditional recursive function to calculate a factorial.
HELLO <cr> Hello, World! The word CR (Carriage Return) causes the output following CR to be displayed on a new line. The parsing word ." (dot-quote) reads a double-quote delimited string and appends code to the current definition so that the parsed string will be displayed upon execution. The space character separating the word ."
The "hello, world" example that appeared in the first edition of K&R has become the model for an introductory program in most programming textbooks. The program prints "hello, world" to the standard output , which is usually a terminal or screen display.
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This "Hello, world!" script is in a file (e.g., script.txt) and invoked with sed -f script.txt inputFileName, where "inputFileName" is the input text file. The script changes "inputFileName" line #1 to "Hello, world!" and then quits, printing the result before sed exits. Any input lines past line #1 are not read, and not printed.