“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。 j,JGs[A
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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》。 `L}Irt}
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以下是用不同语言写成的Hello World程序的几个例子: 6~Xe$fP(
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with Ada.Text_Io; use Ada.Text_Io; \LW
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procedure Hello is [kq+a]q
begin uH!;4@uI
Put_Line ("Hello, world!"); "7a;Apq*
end Hello; 0bk094
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汇编语言 }vdhk0
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x86 CPU,DOS,TASM uU00ZPS*G[
MODEL SMALL Nb;Yti@Y.
IDEAL 1Q$Z'E}SK@
STACK 100H ;zvg] %
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DATASEG u7<s_M3%N
HW DB 'Hello, world!$' A@"CrVE
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CODESEG m)?cXM
MOV AX, @data }mw31=2bD
MOV DS, AX 3AD^B\<gB
MOV DX, OFFSET HW tpi63<N
MOV AH, 09H "n@=.x
INT 21H iP JZ%
MOV AX, 4C00H 8[;U|SR"
INT 21H -xf=dzm)
END fKAG+ t
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x86 CPU,GNU/Linux,NASM "-TIao#
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax).
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;Enter this into "hello.asm" then type: 52#@.Qa
;"nasm -f elf hello.asm" s&$Zgf6Z
;"ld hello.o -o hello" aOj5b>>
;"./hello" X"{s"Mc0G
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section .data ;data section declaration u37@9
msg db 'Hello World!',0AH =jmn
len equ $-msg ;string length ghiFI<)VY
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section .text ;code section declaration A`Bg"k:D
global _start ;entry point (start of execution) .HG0%Vp
_start: mov edx,len ;string length @[S\ FjI
mov ecx,msg ;string start c;bp[Y3R
mov ebx,1 ;file handle: stdout dDy9yw%f?
mov eax,4 ;sys_write _,;c2
int 80h ;kernel system call !W8'apG&[
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mov ebx,0 ;return value "sRR:wzQu
mov eax,1 ;sys_exit .yF7{/
int 80h ;kernel system call #.%;U' #O
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x86 CPU,Windows,MASM32 {j
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.model flat,stdcall R
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option casemap:none }45&s9m=
;Include 文件定义 ([ xYOxcp5
include windows.inc W%.Kr-[?`o
include user32.inc ^r$P&}Z\b
includelib user32.lib mi3 yiR
include kernel32.inc ;^FV
includelib kernel32.lib pUr.<yc&u
;数据段 TP oP%Yj"
.data 70m}+R(`
szCaption db 'A MessageBox!',0 y_8 8I:O
szText db 'Hello,world!',0 qgU$0enSs
;代码段 o$YL\ <qp
.code 3%xj-7z
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start: SVaC)O(
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK z&d&Ky
invoke ExitProcess,NULL V4Ql6vg_f
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> !K1[o'o#
end start Ut8yA"Y~
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BEGIN { print "Hello, world!" } UMw1&"0:
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BASIC X'WbS
传统版BASIC(例如GWBASIC): -2mm
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10 PRINT "Hello, world!" y%\kgWV
20 END HkEfBQmh
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或在提示符输入: Q5/".x^@
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?"Hello, world!":END o|AV2FM)
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现代版BASIC(例如Quick BASIC): Z@ *^4Ve
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Print "Hello, world!" IiIF4 pQ,
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以下的语句在Quick BASIC中同样有效: aDTNr/I
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? "Hello,world!" n_hV;
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GET "LIBHDR" .T/\5_Bx
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LET START () BE =zt@*o{F
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WRITES ("Hello, world!*N") InMF$pw
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Befunge ^c!"*L0E
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C 8/x@|rjW
#include <stdio.h> #7+oM8b
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int main(void) KQj5o>} 6
{ *pCT34'--
printf("Hello, world!\n"); J84Q|E
return 0; %%}U
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} %vDN{%h8
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#include <iostream> 7/w)^&8
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int main() >&7K|$y.J
{ (4LXoNT
std::cout << "Hello, world!" << std::endl; UYn5Pix
return 0; /mX/
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int main() K2<"O qp_W
{ 7,ysixY
System::Console::WriteLine("Hello, world!"); 9^,MC&eb
} j]#qq]c
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