“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。 v i)%$~
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将Hello World程序作为第一个学写的程序,现在已经成为一种传统。该程序最早出现在由Brian Kernighan和Dennis Ritchie写的计算机程序设计教程《C语言程序设计》。 snt(IJQ
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以下是用不同语言写成的Hello World程序的几个例子: n
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Ada _6Eu2|vM&
with Ada.Text_Io; use Ada.Text_Io; 7'-j%!#w
procedure Hello is "sgjWo6
begin P/ oXDI8
Put_Line ("Hello, world!"); tWdhDt8$&
end Hello; Fbp{,V@F2
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汇编语言 ZK'-U,Y.H7
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x86 CPU,DOS,TASM ~kCwJ<E
MODEL SMALL &
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IDEAL l6u&5[C
STACK 100H D)brPMS:o
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DATASEG WpLZQ6wH
HW DB 'Hello, world!$' [,aqQ6S
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CODESEG BvU"4d;x
MOV AX, @data j2Pn<0U
MOV DS, AX 1'4J[S\cM
MOV DX, OFFSET HW =5sF"L;b
MOV AH, 09H gs
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INT 21H YUdxG/~'
MOV AX, 4C00H NA.1QQ;e
INT 21H 6UE(f@
END CZEW-PIhj
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x86 CPU,GNU/Linux,NASM ;_:Oo l,
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). a0*2) uL}
;Enter this into "hello.asm" then type: 8:.nEo'
;"nasm -f elf hello.asm" e2C<PGUUB
;"ld hello.o -o hello" Ft@Wyo`^
;"./hello" ?v-1zCls
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section .data ;data section declaration ;p ]y)3
msg db 'Hello World!',0AH FhIqy %X
len equ $-msg ;string length 1|?K\B
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section .text ;code section declaration 3qQUpm+
global _start ;entry point (start of execution) = zl=SLe
_start: mov edx,len ;string length {$M;H+Foh
mov ecx,msg ;string start )n=ARDd^e
mov ebx,1 ;file handle: stdout ?_`0G/xl
mov eax,4 ;sys_write LjdYsai-
int 80h ;kernel system call kHJ96G
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mov ebx,0 ;return value *wV[TKaN
mov eax,1 ;sys_exit )nu~9km3
int 80h ;kernel system call `Vq`z]}
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x86 CPU,Windows,MASM32
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.386 gNx+>h`AF
.model flat,stdcall uvA(Rn
option casemap:none _B,_4}
;Include 文件定义 [^~7]2 i
include windows.inc @gSkROCdC)
include user32.inc Bfd-:`Jk
includelib user32.lib j|e[s ?d
include kernel32.inc X-B8MoG|
includelib kernel32.lib nB5Am^bP
;数据段 wE).>
.data x"(9II*
szCaption db 'A MessageBox!',0 T ^JuZG
szText db 'Hello,world!',0 FXo2Y]K3`L
;代码段 +dkS/b
.code ?G?gy2
start: l
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invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK Gowp
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invoke ExitProcess,NULL a-n4:QT
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> iS@\ =CK
end start |)W!jC&k
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BEGIN { print "Hello, world!" } TD04/ ISHT
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THhy ~wC".
BASIC v6e%#=
传统版BASIC(例如GWBASIC): NE"jh_m-
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10 PRINT "Hello, world!" |)@N-f:E
20 END -PAF p3w\y
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或在提示符输入: he)ulB
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?"Hello, world!":END {aN(d3c
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现代版BASIC(例如Quick BASIC): #1$}S=8*f
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Print "Hello, world!" iilyw_$H
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以下的语句在Quick BASIC中同样有效: yZSvn[f
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? "Hello,world!" 6T^lS^
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BCPL b2h":G|s
GET "LIBHDR" WfGH|u
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LET START () BE #Y[H8TW
$( pH9HK
WRITES ("Hello, world!*N") h'^FrWaU/
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Befunge ID8k/t!
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Brainfuck "@/ba!L+
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+++++++++++++++.>.+++.------.--------.>+.>. p[YWSjf
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C v`{:~q*
#include <stdio.h> ;]&-MFv#
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int main(void) bNvAyKc-
{ B-Y+F
printf("Hello, world!\n"); GqjO>v fy
return 0; .]Ybp2`"U
} v#=ayWgk
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C++
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#include <iostream> e?)yb^7K
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int main() F7uhuqA]N
{ +)-d_K.(k
std::cout << "Hello, world!" << std::endl; -Uf4v6A
return 0; Tcs3>lJ}
} v_-ls"l
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C++/CLI C
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int main() }Z6nN)[|0Y
{ , ;'SVe%
System::Console::WriteLine("Hello, world!"); ct\<;I(H
} psD[j W
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C# (C Sharp) T` ;k!F46
class HelloWorldApp X'2Gi
{ JfKg_&hM
public static void Main() jI#z/a!j:
{ t/Z!O
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System.Console.WriteLine("Hello, world!"); P7 8uq
} >H?uuzi
} w$% BlqN
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COBOL )b (X
IDENTIFICATION DIVISION. kt<@H11
PROGRAM-ID. HELLO-WORLD. x=3I)}J(kn
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ENVIRONMENT DIVISION. ]xB6cPdLu
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DATA DIVISION. rHo6iJj
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PROCEDURE DIVISION. ZX]A )5G
DISPLAY "Hello, world!". -$tCF >,
STOP RUN. tnRJ#[Io
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Common Lisp q5gP~*?
(format t "Hello world!~%") coO.kTO;
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DOS批处理 7n>|D^
@echo off Gavkil
echo "Hello, world!" <