“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。 |f#hGk6
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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: g}xL7bTlI>
Ada Oo}h:3?
with Ada.Text_Io; use Ada.Text_Io; pB8D
procedure Hello is ]myRYb5Z
begin J-5>+E,nZ
Put_Line ("Hello, world!"); 8Auek#[
end Hello; ,0. kg
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汇编语言 @wI>0B
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x86 CPU,DOS,TASM JfIXv
MODEL SMALL ]HuB%G|t1V
IDEAL _9
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STACK 100H :Kwu{<rJ!(
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DATASEG C,Nf|L((6
HW DB 'Hello, world!$' 1 _?8 OU
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CODESEG )Y7H@e\1
MOV AX, @data VAz4@r7hkq
MOV DS, AX ApXf<MAy
MOV DX, OFFSET HW b-sN#'TDg
MOV AH, 09H Pwl*5/l
INT 21H '|[V}K5m/f
MOV AX, 4C00H <m]0!ii
INT 21H d-D,Gx]>$
END H@=oVyn/
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x86 CPU,GNU/Linux,NASM d+D~NA[M
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). Zj2 si
;Enter this into "hello.asm" then type: t]$n~!
;"nasm -f elf hello.asm" [-])$~WfW
;"ld hello.o -o hello" oAQQ OtpZN
;"./hello" -WlYHW
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section .data ;data section declaration e0zP LU}
msg db 'Hello World!',0AH olE(#}7V
len equ $-msg ;string length u
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section .text ;code section declaration i/x |c!E
global _start ;entry point (start of execution) x#D%3v"l_*
_start: mov edx,len ;string length .B:ZyTI
mov ecx,msg ;string start K381B5_h
mov ebx,1 ;file handle: stdout J:yv82
mov eax,4 ;sys_write wUv?;Y$C
int 80h ;kernel system call b>;?{
Rql/@j`JX
mov ebx,0 ;return value ga5Q
mov eax,1 ;sys_exit yYA*5
7^A
int 80h ;kernel system call u2 s
,t9EL 21
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x86 CPU,Windows,MASM32 ]F4QZV(
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.386 ,|:.0g[n
.model flat,stdcall gwoe1:F:J
option casemap:none MA`nFkVK
;Include 文件定义 eiKY az
include windows.inc z1mB Hz6
include user32.inc A@}5'LzL
includelib user32.lib Z7a@$n3h
include kernel32.inc >^s2$@J?p
includelib kernel32.lib _QL|pLf-
;数据段 !9;m~T7.
.data # )y`Zz{h
szCaption db 'A MessageBox!',0 &Hb%Q! ^Kb
szText db 'Hello,world!',0 "lh4Vg\7n
;代码段
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.code NN*L3yx
start: <=M5)#
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK d @R7b^#g
invoke ExitProcess,NULL E(~7NRRm
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> .q9Sg8G
end start 3ZXAAV
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BEGIN { print "Hello, world!" } {r_HcI(h
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BASIC cRLw)"|
传统版BASIC(例如GWBASIC): ,HZ%q]*:~
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10 PRINT "Hello, world!" 6!\V|
20 END ywwA,9~
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或在提示符输入: s2O()u-
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?"Hello, world!":END d%7?913
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现代版BASIC(例如Quick BASIC): >+M[!;m}
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Print "Hello, world!" ${Un#]g
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以下的语句在Quick BASIC中同样有效: ?Q"andf
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? "Hello,world!" KU|W85ye
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BCPL cp`Jep<T
GET "LIBHDR" *yhA8fJ
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LET START () BE )'+[,z ;s
$( _
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WRITES ("Hello, world!*N") R-Edht|{
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w-K A~
Befunge *tqD:hiF
"!dlrow olleH">v X:i?gRy"
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Brainfuck KQfWpHwfj
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+++++++++++++++.>.+++.------.--------.>+.>. <XLae'R
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C clvg5{^q[
#include <stdio.h> Ae>+Fcv
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int main(void) ^#R`Uptib
{ )g@+
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printf("Hello, world!\n"); kLgkUck8]
return 0; x=DxD&I!J
} VIF43/>(
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C++ +xYu@r%R
#include <iostream> YS|Dw'%g /
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int main() 2y`h'z
{ IWo'{pk
std::cout << "Hello, world!" << std::endl; _[6sr7H!
return 0; @aS)=|Ls\
} 0F)v9EK(W4
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C++/CLI }b2YX+/e$f
int main() 0nt@}\j
{ }b1G21Dc!
System::Console::WriteLine("Hello, world!"); [ cB^6v
} H'WYnhU&
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C# (C Sharp) T_*inPf
class HelloWorldApp Tt: (l/1
{ 2;Z
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public static void Main() HT.,BF
{ =;Q/bD->
System.Console.WriteLine("Hello, world!"); 0qN`-0Yk
} _mm(W=KiL
} ]
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COBOL if&bp ,
IDENTIFICATION DIVISION. (2b${ Q@V
PROGRAM-ID. HELLO-WORLD. .)/."V
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