“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。 z=BX-)
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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》。 +*!oZKm.
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以下是用不同语言写成的Hello World程序的几个例子: 0MrtJNF]_O
Ada -H'_%~OV(
with Ada.Text_Io; use Ada.Text_Io; c@5fiRPv!
procedure Hello is 7 fqK{^L
begin wL5IAkq
Put_Line ("Hello, world!"); ch
\*/
end Hello; ;&;coH8`
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汇编语言 ZCbxL.fFz
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x86 CPU,DOS,TASM @\u)k
MODEL SMALL i+Ob1B@w
IDEAL 3,3{wGvHHW
STACK 100H /=,^fCCN
roj/GZAy"
DATASEG Nz*qz"T
HW DB 'Hello, world!$' ;wJLH\/
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CODESEG VGWqy4m
MOV AX, @data 5}e-\:J>B
MOV DS, AX CH`4FR.-
MOV DX, OFFSET HW B~u{LvTE
MOV AH, 09H %w/o#*j<;
INT 21H >^D"% Oj y
MOV AX, 4C00H [M@i,d-;A
INT 21H >`'#4!}G5j
END OA4NXl'
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x86 CPU,GNU/Linux,NASM ~k|~Q\
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). 6"-LGK:
;Enter this into "hello.asm" then type: hSp[BsF`,
;"nasm -f elf hello.asm" [3t
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;"ld hello.o -o hello" Drk9F"J
;"./hello" hY-;Wfg
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section .data ;data section declaration H,:Cg:E/^
msg db 'Hello World!',0AH b;9v.MZ4>g
len equ $-msg ;string length 7{v0K"E{
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section .text ;code section declaration R4E0avt
global _start ;entry point (start of execution) K34ca-~
_start: mov edx,len ;string length e0(loWq]
mov ecx,msg ;string start V<:kS
mov ebx,1 ;file handle: stdout \EUc17
mov eax,4 ;sys_write g]X4)e]
int 80h ;kernel system call oel3H5Nz
zu*0uL
mov ebx,0 ;return value 0*B_$E06
mov eax,1 ;sys_exit wb"Jj
int 80h ;kernel system call &tLg}7?iB
cV&(L]k>`
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x86 CPU,Windows,MASM32 w_/q5]/V-5
.386 @ DU]XKv
.model flat,stdcall ^^3
>R`
option casemap:none TnPd pynP
;Include 文件定义 EOVHTDkKf
include windows.inc Fm*n>^P@Y
include user32.inc o=w&&B
includelib user32.lib xyBe*,u
include kernel32.inc pc^(@eD
includelib kernel32.lib 2EQ:mjxk
;数据段 GB^Ch YOb
.data [<`xAh_,
szCaption db 'A MessageBox!',0 bveNd0hN
szText db 'Hello,world!',0 QIBv}hgcy
;代码段 (+CB)nV0IA
.code yY`<t
start: '#u|RsZ
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK 'n)M0e
invoke ExitProcess,NULL e,`+6qP{
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> \8{C$"F
end start c}g^wLa
r\` R$
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AWK 3$(1LN
BEGIN { print "Hello, world!" } ,Z&"@g
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BASIC o LuGW5wzj
传统版BASIC(例如GWBASIC): .CQ
IN] iD
HWVWl~FA
10 PRINT "Hello, world!" /G G QO$'
20 END _d %H;<_
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或在提示符输入: 2+sNt6B2
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?"Hello, world!":END Z3~$"V*ZB{
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现代版BASIC(例如Quick BASIC): 42ttmN1F
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Print "Hello, world!" ]{.rx),
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以下的语句在Quick BASIC中同样有效: ;}=v|Dr&I.
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? "Hello,world!" cl^wLC'o
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