“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。 ^~eT#Y8
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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》。
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以下是用不同语言写成的Hello World程序的几个例子: 3eFD[c%mN
Ada ir3iW*5k
with Ada.Text_Io; use Ada.Text_Io; Jel%1'Dc^
procedure Hello is Pg|q{fc
begin m-7^$
Put_Line ("Hello, world!"); VS1gg4tCv
end Hello; ex&&7$CXc
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pJK puoiX
汇编语言 NJLU+byU
0ot=BlMu
x86 CPU,DOS,TASM {;=+#QK/
MODEL SMALL 6(<AuhFu
IDEAL C
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STACK 100H =+A8s$Pb
/!d,f4n
DATASEG <),FI <~
HW DB 'Hello, world!$' x{5I
fb&K.6"
CODESEG ~|R"GloUw
MOV AX, @data OKxPf]~4E
MOV DS, AX ?Ju=L|
MOV DX, OFFSET HW xBR2tDi%
MOV AH, 09H v=iz*2+X
INT 21H (:vY:-\ bO
MOV AX, 4C00H !>
INT 21H %fK"g2:
END r]kLe2r:B
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x86 CPU,GNU/Linux,NASM YmNBtGhT
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). J[RQF54qA{
;Enter this into "hello.asm" then type: O9:vPbn
;"nasm -f elf hello.asm" F~)xZN3=
;"ld hello.o -o hello" !N?|[n1
;"./hello" `b# w3 2
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section .data ;data section declaration SI8mr`gJ
msg db 'Hello World!',0AH _+.z2} M
len equ $-msg ;string length .ye5;A}
r6*0H/*
section .text ;code section declaration )7*Apy==x
global _start ;entry point (start of execution) f)?s.DvUB
_start: mov edx,len ;string length po\Q Me
mov ecx,msg ;string start cQS}pQyYN
mov ebx,1 ;file handle: stdout AIN_.=]"?
mov eax,4 ;sys_write ~^KemwogPN
int 80h ;kernel system call /8Ca8Ju
`SFI\Y+WDT
mov ebx,0 ;return value &HT
PeB
mov eax,1 ;sys_exit |JnJ=@-y
int 80h ;kernel system call 6 @'v6 1'
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x86 CPU,Windows,MASM32 L+9a4/q
.386 y~]>J^
.model flat,stdcall ~~&8I!r e
option casemap:none H [R|U
;Include 文件定义 CdC&y}u
include windows.inc uRxo,.}c
include user32.inc ,.x1+9X
includelib user32.lib ceyZ4M
include kernel32.inc Mpb|qGi!
includelib kernel32.lib vb\ UP&Ip
;数据段 Ub4j3`
.data j]M$>2;
szCaption db 'A MessageBox!',0 <