“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。 3Mxp)uG/
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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》。 rqdE6y+^
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以下是用不同语言写成的Hello World程序的几个例子: ;pqg/>W'
Ada rM .|1(u
with Ada.Text_Io; use Ada.Text_Io; o_@4Sl8
procedure Hello is ~aMlr6;
begin :bz}c48%
Put_Line ("Hello, world!"); \^ZlG.
end Hello; \hBG<nH{0
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汇编语言 RRRCS]y7$t
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x86 CPU,DOS,TASM 7on.4/;M
MODEL SMALL 5Yl<h)1
IDEAL 2] zq#6ix
STACK 100H /LO-HnJ
[x9KVd ^d
DATASEG 3):A
HW DB 'Hello, world!$' t.laO. 3
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CODESEG *^f<W6xc
MOV AX, @data _9=Yvc=
MOV DS, AX rW+ =,L
MOV DX, OFFSET HW lrv3fPIW
MOV AH, 09H `&D|>tiz
INT 21H a#>Yh;FA
MOV AX, 4C00H P8>~c9$I
INT 21H zx-81fx+k
END kO|L bQ@=q
c17_2 @N
f7=((5N
x86 CPU,GNU/Linux,NASM
/% M/
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). i(iXD
;Enter this into "hello.asm" then type: nHm}zOLc
;"nasm -f elf hello.asm" c
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;"ld hello.o -o hello" 5<UVD:~z
;"./hello"
yls
^ cyX
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section .data ;data section declaration z"0I>gl
msg db 'Hello World!',0AH E=>FjCsu<-
len equ $-msg ;string length #)C[5?{SNq
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section .text ;code section declaration BZR:OtR^
global _start ;entry point (start of execution) ;
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_start: mov edx,len ;string length Kac' ;1
mov ecx,msg ;string start M+w=O!dq
mov ebx,1 ;file handle: stdout h&--,A >
mov eax,4 ;sys_write w]]8dz
int 80h ;kernel system call Cn "s`
q
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mov ebx,0 ;return value C!fMW+C@
mov eax,1 ;sys_exit ;i<|9{;
int 80h ;kernel system call X&7F_#s
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x86 CPU,Windows,MASM32 hRK/T7v
.386 X{\F;Cb*
.model flat,stdcall 9Hf9VC3
option casemap:none ~])t 6i
;Include 文件定义 YgUvOyaQXf
include windows.inc jO!y_Y]B
include user32.inc J2'Nd'
includelib user32.lib uf&myV7
include kernel32.inc DV<` K$ET
includelib kernel32.lib P] UJ0b
;数据段 PfC!lI
BU
.data e>(<eu~P
szCaption db 'A MessageBox!',0 f!!V${)X
szText db 'Hello,world!',0 G>1eFBh }
;代码段 yIDD@j=l
.code 9J9)AV
start: Q\
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invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK uF1~FKB
invoke ExitProcess,NULL "a8j"lPJ
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> a hR ^
end start S"OR%
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BEGIN { print "Hello, world!" } n&-qaoNl
%we u 1f
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BASIC =gJb^
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传统版BASIC(例如GWBASIC): n#wI@W>%+
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10 PRINT "Hello, world!" YRh BRE
20 END `eIenA
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或在提示符输入: 2ioQb`=
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?"Hello, world!":END *
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现代版BASIC(例如Quick BASIC): \ aHVs
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Print "Hello, world!" O'W0q;rT
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以下的语句在Quick BASIC中同样有效: 8erSt!oM
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? "Hello,world!" /)4I|"}R0I
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BCPL ^sVX)%
GET "LIBHDR" j{Txl\D>
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LET START () BE q~*t@
$( FvJd8kV
WRITES ("Hello, world!*N") uwjGDw
$) 'rr^2d]`ST
Um: Hrjw
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Befunge jSwf*u
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Brainfuck Ygl%eP%Z
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C ;Hj~n+
#include <stdio.h> aOiR l,
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int main(void) /Ne<V2AX
{ DNj"SF(J
printf("Hello, world!\n"); X_g 3rv1J
return 0; 'I /aboDB
} e&qh9mlE
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C++ =n'
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#include <iostream> qq1 - DG
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int main() }GZ}Q5
{ @;H,gEH^
std::cout << "Hello, world!" << std::endl; SY^dWLf
return 0; Iz{R}#8CZ
} 1[t=XDz/e
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C++/CLI _+^ 2^TW
int main() )"m!YuS Y
{ }QsZ:J.
System::Console::WriteLine("Hello, world!"); nYt/U\n!
} XxaGp95so
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C# (C Sharp) fuB)qt!E
class HelloWorldApp x
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{ ocyb5j
public static void Main() D^-7JbE]
{ = 07]z@s
System.Console.WriteLine("Hello, world!"); cn-
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} VT.;:Q
} QZ?=M@|f
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COBOL mnID3=JF
IDENTIFICATION DIVISION. iK IOh('G
PROGRAM-ID. HELLO-WORLD. brZ sAQ+k
C( id=F
ENVIRONMENT DIVISION. Z-B%'/.
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