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Hello World
来自NOCOW
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Hello World一般是指一个用来在屏幕上显示“Hello World!”的简单程序，或是标记语言代码等，通常用来测试软件环境是否已经设置好、可以使用，或者作为初学一种语言的人用来测试的第一个程序。在有些开发环境中，这也是通过模板新建一个文件之后程序主要代码部分默认的内容。
这个程序最早在Brian Kernighan和Dennis Ritchie写的《C语言程序设计》中出现，现在已经成为一个传统。很多地方进行语法教学或者演示一种或者多种语言的基本语法的时候，都会用Hello World作为例子。从Hello World这个程序中就可以看出很多语言的一些语法上的特点。不过也有不少解释执行语言中的文本输出使用特殊的语法，这时候只看Hello World程序可能看不出什么。
对于一些特殊的语言，例如不是为字符串设计的数学用语言，可能输出Hello World字符串比较麻烦，这时候的测试程序也可能用一些更简单的程序，或者适用于这个语言的另一个传统。至于题目的在线评测系统（OJ），通常以A+B问题作为第一个测试程序，因为这个程序不仅能测试程序的编译以及输出，还可以测试输入以及在这个网站中程序的基本写法等。也有一部分OJ使用另外的测试程序。
目录 |
[编辑] 解法
请参见你所用的语言中输出函数（也可能叫做过程、语句、方法等）的用法。另外很多语言的程序需要用特殊的格式，参见相应的语言的介绍内容。
除了科学上用的没有为字符串输出设计的特殊语言，这都是一个最基本的程序。这个程序往往也会出现在相关语言的介绍、教程中。
如果这个程序出现问题，往往编译器或者解释器能给出相应的错误提示。如果还有问题，请确认自己已经掌握这门语言并检查软件环境是否安装正确。
[编辑] 范例程序
[编辑] 0-1
4D 5A 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 B0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 50 45 00 00 4C 01 03 00 00 00 00 00 00 00 00 00 00 00 00 00 E0 00 02 00 0B 01 07 07 00 00 00 00 00 00 00 00 00 00 00 00 00 10 00 00 00 00 00 00 00 00 00 00 00 00 40 00 00 10 00 00 00 02 00 00 00 00 00 00 00 00 00 00 04 00 00 00 00 00 00 00 00 40 00 00 00 04 00 00 00 00 00 00 03 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 02 00 00 00 00 00 00 00 00 00 00 00 10 20 00 00 3C 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 2E 74 65 78 74 00 00 00 26 00 00 00 00 10 00 00 00 02 00 00 00 04 00 00 00 00 00 00 00 00 00 00 00 00 00 00 20 00 00 60 2E 72 64 61 74 61 00 00 92 00 00 00 00 20 00 00 00 02 00 00 00 06 00 00 00 00 00 00 00 00 00 00 00 00 00 00 40 00 00 40 2E 64 61 74 61 00 00 00 16 00 00 00 00 30 00 00 00 02 00 00 00 08 00 00 00 00 00 00 00 00 00 00 00 00 00 00 40 00 00 C0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 6A 00 68 00 30 40 00 68 07 30 40 00 6A 00 E8 07 00 00 00 6A 00 E8 06 00 00 00 FF 25 08 20 40 00 FF 25 00 20 40 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 84 20 00 00 00 00 00 00 5C 20 00 00 00 00 00 00 4C 20 00 00 00 00 00 00 00 00 00 00 6A 20 00 00 08 20 00 00 54 20 00 00 00 00 00 00 00 00 00 00 84 20 00 00 00 20 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 5C 20 00 00 00 00 00 00 76 20 00 00 00 00 00 00 9D 01 4D 65 73 73 61 67 65 42 6F 78 41 00 75 73 65 72 33 32 2E 64 6C 6C 00 00 80 00 45 78 69 74 50 72 6F 63 65 73 73 00 6B 65 72 6E 65 6C 33 32 2E 64 6C 6C 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 55 69 6E 67 00 00 00 48 65 6C 6C 6F 20 57 6F 72 6C 64 21 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[编辑] debug
a 100 mov dx,109 mov ah,9 int 21 jmp 107 e 109 48 65 6C 6C 6F 20 57 6F 72 6C 64 21 24 r cx 16 n hello.com r cx 16 w
[编辑] Assembly
.486 .model flat, stdcall option casemap :none include hello.inc .code szHello db "Hello, World!", 0 start: Main proc invoke MessageBox, NULL, offset szHello, offset szHello, NULL invoke ExitProcess,NULL Main endp end start
[编辑] Pascal
begin writeln('Hello World!') end.
[编辑] C++
#include<iostream> int main(){ std::cout<<"Hello World!"<<std::endl; return 0; }
#include <stdio.h> main(t ,_,a) char*a;{return t<1?main(*a,a[-t],"=a-1kj3gnm:q\ ebh_cf*<r.d>i^+?,()[?qzyrjuvcdefg\ h,!kbpolwxs'.t main(")&&a[-t]&&main (t-1,_,a):t/2?_==*a?putchar(32[a]) :_%115<36||main(t,_,a+1):main( 0,t,"t#!tx}uy#t!b|s!!:xu!\ #zx}s!!rr}xzu|yyz{|y|\ vw}}x{#|zwv}x~tx}\ uv!w<uw?}|t~.\ <k}#yrm}!\ ^~vx") ;}
[编辑] Basic
?"Hello World!"[编辑] PHP
<?php echo "Hello World!"; ?>
[编辑] Javascript
document.write("Hello World!")
[编辑] Windows命令行
@echo.Hello World!
[编辑] Bash
#!/bin/bash echo "Hello World!"
[编辑] BrainFuck
++++++++[->+++++++++>++++>+++++++++++<<<]>.<++++++[->+++++<]>-. +++++++..+++.>.+>-.[-]<<.+++.------.--------.[-]>.[---<+>]<-.[-]<
[编辑] Metapost
beginfig(1);
draw (0,0)--(0,10);
draw (0,5)--(5,5);
draw (5,0)--(5,10);
draw (12,0)--(7,0)--(7,10)--(12,10);
draw (12,5)--(7,5);
draw (14,10)--(14,0)--(19,0);
draw (21,10)--(21,0)--(26,0);
draw (28,5)...(30.5,0)...(33,5)...(30.5,10)...cycle;
draw (38,10)--(39.25,0)--(40.5,10)--(41.75,0)--(43,10);
draw (45,5)...(47.5,0)...(50,5)...(47.5,10)...cycle;
draw (52,0)--(52,10);
draw (52,10)..(57,4)..(52,6.5);
draw (52,5)--(57,0);
draw (61,10)--(61,0)--(66,0);
draw (68,10)--(68,0)..(73,5)..cycle;
endfig;
end
它会帮你画出来……
[编辑] WhiteSpaces
[编辑] Python 3.0以前
#!/usr/bin/python print "Hello World"
[编辑] Python 3.0及以后
#!/usr/bin/python print("Hello World")
[编辑] 局限
通常Hello world!只能反应出软件已经安装设置完成，很少能反应出别的问题，例如字体样式、排版等。对于排版，通常用大段的话代替（例如Lorem Ipsum）。对于字体，通常使用一个包含所有的字母的句子，如：
A brown fox jumped over the lazy dog. The lazy dog jumped over a brown fox. A fox jumped over the brown zygal god.
[编辑] 参见
[编辑] 外部链接
- 维基百科上的Hello World条目，包括更多的语言的范例程序。
