“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。 )1Rn;(j9Re
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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》。 1e`/N+6u
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以下是用不同语言写成的Hello World程序的几个例子: H..g2;D
Ada RUcpdeo
with Ada.Text_Io; use Ada.Text_Io; 5/j7 C>
procedure Hello is hwF9LD~^
begin UhuEE
Put_Line ("Hello, world!"); 3xS+Pu\)
end Hello; utIR\e#:B
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汇编语言 _t<D~
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x86 CPU,DOS,TASM q$)$?"
MODEL SMALL v"M5';ZS>
IDEAL >]N}3J}47g
STACK 100H i0`<`qSQh
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DATASEG AR9D;YfR~
HW DB 'Hello, world!$' j)4:*R.Z]
j8p</gd
CODESEG nn>1OO
MOV AX, @data ""cnZZ5)
MOV DS, AX +a$'<GvP
MOV DX, OFFSET HW #/fh_S'Z
MOV AH, 09H O~t]:p9_
INT 21H `.3!
MOV AX, 4C00H kO:|?}Koc
INT 21H d-e6hI4b
END Yud]s~N
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x86 CPU,GNU/Linux,NASM ^mWOQ*zi;
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). /Qh
;Enter this into "hello.asm" then type: [J0f:&7\
;"nasm -f elf hello.asm" nY(>|!
;"ld hello.o -o hello" F?!P7 zW
;"./hello" yWI30hW
!u@XEN>/
section .data ;data section declaration KU,KEtf
msg db 'Hello World!',0AH v{%x,K56
len equ $-msg ;string length I9S=VFhZ`
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section .text ;code section declaration up+W[#+
global _start ;entry point (start of execution) v+a$Xh3Y~
_start: mov edx,len ;string length u{#}Lo>B #
mov ecx,msg ;string start e>yPFXSk
mov ebx,1 ;file handle: stdout Y~ j.Kt
mov eax,4 ;sys_write (Fc\*Vn
int 80h ;kernel system call 2$=U#!OtU
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mov ebx,0 ;return value NfG<!
mov eax,1 ;sys_exit B/"TaXVU
int 80h ;kernel system call YbaaX{7^
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x86 CPU,Windows,MASM32 ${(v
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.386 }^|g|xl!
.model flat,stdcall uTsxSkHb/
option casemap:none s"u6po.'
;Include 文件定义 [
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include windows.inc a?Q\nu1
include user32.inc W+HiH`Qb]
includelib user32.lib wOW#A}m'vj
include kernel32.inc `SDpOqfIrP
includelib kernel32.lib a]0B{
;数据段 @.IGOh
.data w>-@h>Ln
szCaption db 'A MessageBox!',0 U^qQ((ek
szText db 'Hello,world!',0 &72
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;代码段 |'mwr!
.code UC3&:aQ!
start: 7Mx F?
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invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK Q-A:0F&{t
invoke ExitProcess,NULL pib i#
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> L{;Sc_
end start _=,\uIrk
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BEGIN { print "Hello, world!" } ?D 8<}~Do
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BASIC 'p%aHK{
传统版BASIC(例如GWBASIC): rGa@!^hk
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10 PRINT "Hello, world!" E}^np[u7
20 END g.L~Z1-
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或在提示符输入: @zu IR0Gr)
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?"Hello, world!":END 91I6-7# Xt
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现代版BASIC(例如Quick BASIC): U.XvS''E
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Print "Hello, world!" zN3[W`q+m
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以下的语句在Quick BASIC中同样有效: b/#SkxW#S
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? "Hello,world!" @;\2 PD
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GET "LIBHDR" \[\4= !v
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LET START () BE (Dat`:
$( 3H^0v$S
WRITES ("Hello, world!*N") F747K);_
$) BZJ\tPSR
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Befunge w\V1pu^6@
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#include <stdio.h> <QuIX A
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int main(void) $&25hvK,
{ UWW^g@d4
printf("Hello, world!\n"); uBp,_V?
return 0; <mrvuWg0
} LoUHStt
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C++ N>TmaUk
#include <iostream> hQeGr2gMq
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int main() /M :7
{ jj,CBNo(
std::cout << "Hello, world!" << std::endl; -/V,<@@T
return 0; N!PPL"5z
} ,59G6o
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int main() 3 as~yF0
{ u1}/SlCp
System::Console::WriteLine("Hello, world!"); K N Y
}
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C# (C Sharp) C6?({
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class HelloWorldApp !"g2F}n
{ 7"_m?c8
public static void Main() zb]e{$q2C
{ vh$If0
System.Console.WriteLine("Hello, world!"); sH'IA~7
} +P &S0/
} oSf6J:?*e
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