“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。 y8D'V)B
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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》。 ~NMal]Fwx
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以下是用不同语言写成的Hello World程序的几个例子: +79?}|
Ada k]] (I<2
with Ada.Text_Io; use Ada.Text_Io; #7/_Usso
procedure Hello is &zynfj#o
begin U(3{6^>Gc
Put_Line ("Hello, world!"); GBGGV#_q'}
end Hello; ?Xx,[Z&
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汇编语言 3;u* _ ]N_
k "LbB#Q
x86 CPU,DOS,TASM w q% 4'(
MODEL SMALL >u4%s7v
IDEAL CVyqr_n65/
STACK 100H +>@<'YI<
EX~ U(JB6
DATASEG q1;}~}W;z4
HW DB 'Hello, world!$' I?.$
7xb z)FI
CODESEG wyMj^+ 2m
MOV AX, @data .Qn54tS0q
MOV DS, AX O\,n;oj
MOV DX, OFFSET HW [u[F6Wst
MOV AH, 09H hCQzD2
INT 21H KLGhsx35
MOV AX, 4C00H ~B'K_#
INT 21H mA|!IhM
END `i<;5s!rX
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x86 CPU,GNU/Linux,NASM 4/e-E^
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). HW;,XzP=
;Enter this into "hello.asm" then type: =cs;avtL
;"nasm -f elf hello.asm" 4=9To|U*
;"ld hello.o -o hello" Ix93/FAn
;"./hello" qrsPY d
BQ2EDy=}6
section .data ;data section declaration <]r.wn=}M
msg db 'Hello World!',0AH co r?#
len equ $-msg ;string length > nDx)!I
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section .text ;code section declaration }nvHE o
global _start ;entry point (start of execution) ,[71,zs
_start: mov edx,len ;string length ,a9<\bd)
mov ecx,msg ;string start Vv~rgNh
mov ebx,1 ;file handle: stdout ,^3eMn
mov eax,4 ;sys_write {s6;6>-kPW
int 80h ;kernel system call Iw(deD
[cv7s=U%
mov ebx,0 ;return value (%ra~s?
mov eax,1 ;sys_exit ZRf-V9
int 80h ;kernel system call -o#HO_9
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m646|G5
x86 CPU,Windows,MASM32 J*Dj`@`4`g
.386 f^@`[MJj1C
.model flat,stdcall oj /:
option casemap:none S 0eD
2
;Include 文件定义 ]&`_5pS
include windows.inc H[#s&Fk2
include user32.inc US A!N
includelib user32.lib GJ edW
include kernel32.inc ~'2)E/IeV
includelib kernel32.lib :?2+'+%'
;数据段 x_CB'Rr6
.data !2s<
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szCaption db 'A MessageBox!',0 Nc:, [8{l
szText db 'Hello,world!',0 /-Y*V*E
;代码段 X[\b!<C
.code jbcJ\2
start: -h%;L5oJ2,
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK 55)!cw4
invoke ExitProcess,NULL <*E{zr&
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
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end start \Q7Nz2X
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AWK =PWh,lWS
BEGIN { print "Hello, world!" } Z;M]^?
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BASIC jFf2( AR
传统版BASIC(例如GWBASIC): ( >zXapb2
qMD 6LWJ
10 PRINT "Hello, world!" *T'
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20 END u1s^AW8 y
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或在提示符输入: PXof-W
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?"Hello, world!":END J;,6ydf8!
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现代版BASIC(例如Quick BASIC): Y4e64`V)
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Print "Hello, world!" KoZ" yD
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以下的语句在Quick BASIC中同样有效: Q]9H9?}N?
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? "Hello,world!" 5<\&7P3y
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BCPL [ &RZ&
GET "LIBHDR" dIgaw;Ch]
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LET START () BE teH $hd-q
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WRITES ("Hello, world!*N") E5qh]z(
$) ":EfR`A#
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Befunge =Bo (*%
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C T8+A`z=tSb
#include <stdio.h> ieXhOA
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int main(void) |Z'NMJU
{ HTiqErD2_
printf("Hello, world!\n"); |!:ImX@
return 0; tn!z^W
} CKwrE]h
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C++ (]7&][
#include <iostream> }la\?I
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int main() gjB36R
{ Ex2TV7I
std::cout << "Hello, world!" << std::endl; <+@?V$&
return 0; Qz/o-W;
} yx?Z&9z <