“Hello, World!”程序是一个只在计算机屏幕上打印出“Hello, World!”(英语,意为“世界,你好!”)字串的计算机程序。该程序通常是计算机程序设计语言的初学者所要学习编写的第一个程序。它还可以用来确定该语言的编译器、程序开发环境以及运行环境已经正确安装。 Y?>us
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将Hello World程序作为第一个学写的程序,现在已经成为一种传统。该程序最早出现在由Brian Kernighan和Dennis Ritchie写的计算机程序设计教程《C语言程序设计》。 /NDuAjp[@
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以下是用不同语言写成的Hello World程序的几个例子: 'F[ C 4
Ada L!]~J?)
with Ada.Text_Io; use Ada.Text_Io; /-W-MP=Wd
procedure Hello is "<J%@
begin 7JNy;$]/
Put_Line ("Hello, world!"); K{s%h0
end Hello; yU@~UCmja
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汇编语言 j_r7oARL
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x86 CPU,DOS,TASM *I(g~p
MODEL SMALL b:iZ.I
IDEAL Q#i^<WUpg
STACK 100H 8zRb)B+
Yv`8{_8L
DATASEG kH43 T
HW DB 'Hello, world!$' -*K!JC-
Q l$t
CODESEG ($oO,
c'z
MOV AX, @data .2b) rKo~
MOV DS, AX P~+?:buqc
MOV DX, OFFSET HW Bn"r;pqWiT
MOV AH, 09H Y,bw:vX
INT 21H ikGH:{
MOV AX, 4C00H yt&eY6Xp
INT 21H Dk'EKT-
END hao0_9q+
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x86 CPU,GNU/Linux,NASM @HfWAFT
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). ?[W(r$IaE
;Enter this into "hello.asm" then type: bw7!MAXd
;"nasm -f elf hello.asm" i;0`d0^
;"ld hello.o -o hello" {I|k@
;"./hello" <(JsB'TK
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section .data ;data section declaration {/BEO=8q2
msg db 'Hello World!',0AH \ooqa<_
len equ $-msg ;string length /S;o2\
v.1= TBh
section .text ;code section declaration `~(C\+gUp
global _start ;entry point (start of execution) K]bS:[34 R
_start: mov edx,len ;string length =3=KoH/'
mov ecx,msg ;string start F_~-o,\
mov ebx,1 ;file handle: stdout W4CI=94
mov eax,4 ;sys_write D^PsV
int 80h ;kernel system call 
.model flat,stdcall GxZQ{
\
option casemap:none wZa;cg.-q
;Include 文件定义 <J-OwO a-1
include windows.inc !E_uQ?/w]Z
include user32.inc /^[)JbgB
includelib user32.lib Re1@2a>
include kernel32.inc d L%E0o
includelib kernel32.lib %,,h )9
;数据段 &up/`8
.data `A
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szCaption db 'A MessageBox!',0 M]` Q4\
szText db 'Hello,world!',0 3R#<9O
;代码段 pjj
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.code 'v|2}T*
start: =w A< F
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK GvzPT2E!
invoke ExitProcess,NULL ]|`gTD6
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> cHsJQU*K6
end start j|G-9E
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AWK Bhq(bV
BEGIN { print "Hello, world!" } ,t+ATaOF
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BASIC )ql?}
传统版BASIC(例如GWBASIC): _&%!4n#>
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10 PRINT "Hello, world!" EhFhL4Xdn
20 END J/<`#XZB
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或在提示符输入: *>'R
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?"Hello, world!":END ^p7(
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现代版BASIC(例如Quick BASIC): &\X;t|
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Print "Hello, world!" xRY5[=97
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以下的语句在Quick BASIC中同样有效: tJu<#hX
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? "Hello,world!" p 5o;Rvr
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BCPL j d81E
GET "LIBHDR" U KJY.W!w4
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LET START () BE h@DJ/&;u@
$( u=l(W(9=
WRITES ("Hello, world!*N") lhI;K4#
$) Kmnr}Lp9
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+-nQ,
fOV
Befunge 4AM*KI
"!dlrow olleH">v $~YuS_sYg
, Yq^y"rw
^_@ 1}uDgz^
lewDR"0Kx
+n, BD C;
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++++++++++[>+++++++>++++++++++>+++>+<<<<-]>++.>+.+++++++..+++.>++.<< X2uX+}h*tA
+++++++++++++++.>.+++.------.--------.>+.>. }gW}Vr <
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#include <stdio.h> eI}VH BAz
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int main(void) +o
{ E%^28}dN
printf("Hello, world!\n"); =vc5,
return 0; C P#79=1
} DOerSh_0W
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C++ YP<]f>SBt
#include <iostream> %)9]dOdOk
%-l:_A
int main() +*J4q5;E[?
{ xiF%\#N
std::cout << "Hello, world!" << std::endl; X6.O;
return 0; aHC;p=RQ\A
} 'D&G~$
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C++/CLI / D ]B
int main() zb/Xfu.)?6
{ <~M9nz(<