“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。 q+
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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》。 ul]hvK{2
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以下是用不同语言写成的Hello World程序的几个例子: ccT
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Ada h:i FLS f
with Ada.Text_Io; use Ada.Text_Io; /4;Sxx-
procedure Hello is ji<(}d~L*
begin :mhO/Bx
Put_Line ("Hello, world!"); N]-skz<v
end Hello; >z73uKA(
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汇编语言 Js^(mRv=
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x86 CPU,DOS,TASM eQ*zi9na
MODEL SMALL "q
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IDEAL rDGrq9
STACK 100H JAy-N bb\
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DATASEG n<1*cL:8B
HW DB 'Hello, world!$' :3{n(~
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CODESEG 39L_O RMH
MOV AX, @data o5:md :\
MOV DS, AX @|{8/sOq
MOV DX, OFFSET HW S0ltj8t
MOV AH, 09H :KqSMuKR
INT 21H Jp=
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MOV AX, 4C00H 7>h(M+
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INT 21H Ii<k<Bt,
END ~V0 GRPnI
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x86 CPU,GNU/Linux,NASM {^k7}`7,
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). u>=\.d<
;Enter this into "hello.asm" then type: F$i 6
;"nasm -f elf hello.asm" 39I|.B"
;"ld hello.o -o hello" +U4';[LG1C
;"./hello" \-sW>LIA
v`S ;.iD
section .data ;data section declaration O$N;a9g
msg db 'Hello World!',0AH IC1nR
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len equ $-msg ;string length DXQ]b)y+N
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section .text ;code section declaration Dl,sl>{
global _start ;entry point (start of execution) Sjo-Xf}
_start: mov edx,len ;string length lMcO2006L
mov ecx,msg ;string start lbPn<
mov ebx,1 ;file handle: stdout "&o"6ra}
mov eax,4 ;sys_write dnV&U%fO
int 80h ;kernel system call y`z4S,
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mov ebx,0 ;return value >v f-,B
mov eax,1 ;sys_exit (?ULp{VPFl
int 80h ;kernel system call ^]Q.V
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ev4_}!
x86 CPU,Windows,MASM32 *9|p}q9n
.386 2:<H)oB
.model flat,stdcall 85$ WH
option casemap:none Bd- &~s^
;Include 文件定义 <[w5M?n8
include windows.inc 3Pp+>{2_?
include user32.inc x U"g~hT
includelib user32.lib Pz\ByD
include kernel32.inc 4iZg2"[D
includelib kernel32.lib CugZ!>;^
;数据段 )&Z`SaoP|J
.data I8c:U2D
szCaption db 'A MessageBox!',0 `\'V]9wS
szText db 'Hello,world!',0 PjXiYc&
;代码段 OUFy=5(%:
.code G6lC[eK
start: F_I!qcEQ
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK \<dg
invoke ExitProcess,NULL "zkQu
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> YV} "#
end start r4<As` &
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BEGIN { print "Hello, world!" } 1OqVV?oz
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BASIC u /DE
传统版BASIC(例如GWBASIC): q*tGlM@R?
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10 PRINT "Hello, world!" Bs|Xq'1M!;
20 END %yd(=%)fMB
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或在提示符输入: Z1:<i*6>D
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?"Hello, world!":END <
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现代版BASIC(例如Quick BASIC): |MagK$o
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Print "Hello, world!" %*o
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以下的语句在Quick BASIC中同样有效: 2 |JEGyDS-
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? "Hello,world!" :U/]*0b
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BCPL sI h5cT
GET "LIBHDR" UFu0{rY_
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LET START () BE 9
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WRITES ("Hello, world!*N") o|q5eUh=EY
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d R=0K
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Befunge BkPt 1i
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Brainfuck Vh2uzG
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+++++++++++++++.>.+++.------.--------.>+.>. nC!]@lA
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#include <stdio.h> ~WORC\kCW
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int main(void) 5k9
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{ %NJ0Y(:9(
printf("Hello, world!\n"); G-|c%g!ejf
return 0; *uf)t,%
} >;R`Q9s7
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C++ Di27=_J
#include <iostream> )UpVGT)
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int main() aXG|IN5 *m
{ JM?__b7g2
std::cout << "Hello, world!" << std::endl; aG#d41O
return 0; VzIZT{
} HY1K(T
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int main() g/ShC8@=u
{ g|->W]q@;
System::Console::WriteLine("Hello, world!"); J~4mp\4b
} rx 74v!
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C# (C Sharp) cWZ uph\
class HelloWorldApp tm1&OY
{ 54JZOtC3~
public static void Main() F?"Gln~;
{ n4M
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System.Console.WriteLine("Hello, world!"); 3e47UquZ
} at{p4Sl
} Ha/Qz'^S;
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COBOL [Gv8Fn/aG
IDENTIFICATION DIVISION. !g6=/9
PROGRAM-ID. HELLO-WORLD. mMOgx
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ENVIRONMENT DIVISION. R@s|bs?
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DATA DIVISION. !Q_Wbu\U
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PROCEDURE DIVISION. b_6cK#
DISPLAY "Hello, world!". K]Vp! G
STOP RUN. )=X g
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Common Lisp ='w 2"4
(format t "Hello world!~%") ?u?mSO/
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DOS批处理 Z<^EZX3N
@echo off [7~AWZU3
echo "Hello, world!" n1JV)4Mv
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Eiffel vu.?@k@
class HELLO_WORLD G4~@
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creation L(cKyg[R
make RSbq<f>BFo
feature oF]]Pl{W
make is I=
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local koS?UYF`
io:BASIC_IO )u28:+8
do "*j8G8
!!io ot2zY
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io.put_string("%N Hello, world!") 6__!M
end -- make *QWOWg4w
end -- class HELLO_WORLD rC!"<