“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。 2g;Id.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》。 Tb{RQ?Nw'
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以下是用不同语言写成的Hello World程序的几个例子: c, }VC-
Ada ]2MX7
with Ada.Text_Io; use Ada.Text_Io; f0*_& rP
procedure Hello is 6+:;Mb_S
begin L),bPfz
Put_Line ("Hello, world!"); 'Qg.D88
end Hello; Op hD_^
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汇编语言 \+k~p:d_8
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x86 CPU,DOS,TASM xsU3c0wbr8
MODEL SMALL ~w}=Oby'y
IDEAL '30JJ0
STACK 100H #It!D5A
sY?sQ'E2]
DATASEG ?5wsgP^
HW DB 'Hello, world!$' IH.EvierJ
t;_1 /mt
CODESEG 18]Q4s8E
MOV AX, @data \p!m/2
MOV DS, AX ..=lM:13|
MOV DX, OFFSET HW /buj(/q^#
MOV AH, 09H 8#HQ05q>
INT 21H B)rBM
MOV AX, 4C00H i*mI-l
INT 21H y (=0
END 1yTw*vH F
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x86 CPU,GNU/Linux,NASM xM/WS':V
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). ri4:w_/{,Y
;Enter this into "hello.asm" then type: m<!CF3g
;"nasm -f elf hello.asm" ?\zyeWK0L
;"ld hello.o -o hello" ?F~0\T,7
;"./hello" {ea*dX872:
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section .data ;data section declaration 4v2JrC;
msg db 'Hello World!',0AH {vur9L
len equ $-msg ;string length 3M>y.MS
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section .text ;code section declaration 2hTsjJ!'
global _start ;entry point (start of execution) `0-i>>
_start: mov edx,len ;string length 'lmjZ{k
mov ecx,msg ;string start |RDE/
mov ebx,1 ;file handle: stdout #q8/=,3EG
mov eax,4 ;sys_write <)o xs]<
int 80h ;kernel system call 2
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mov ebx,0 ;return value 6L2Wv5C
mov eax,1 ;sys_exit jI$7vmO
int 80h ;kernel system call xFyBF[c
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x86 CPU,Windows,MASM32 k0xm-
.386 {7K l#b
.model flat,stdcall ~u r}6T
option casemap:none 5e2yJ R
;Include 文件定义 t`1~5#?Du(
include windows.inc ;9qwB
include user32.inc '(8}
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includelib user32.lib pWKI^S
include kernel32.inc q'jInwY|x
includelib kernel32.lib WctGhGH
;数据段 6>h"Lsww
.data *k 0;R[IAV
szCaption db 'A MessageBox!',0 Nl{on"il
szText db 'Hello,world!',0 KCn#*[
;代码段 SnoEi~Da
.code $-gRD|oY
start: "rw'mogRL
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK /q^_
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invoke ExitProcess,NULL d)0 hAdh
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> @! jpJ}
end start N
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AWK GGFrV8
BEGIN { print "Hello, world!" } FOqD
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BASIC bbWW|PtWwP
传统版BASIC(例如GWBASIC): ?$b*)<
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10 PRINT "Hello, world!" &lW~ot1,
20 END ;5}"2hU>
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或在提示符输入: ET|4a(x
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?"Hello, world!":END Ft8ii|-
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现代版BASIC(例如Quick BASIC): 2X=*;r"{J
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Print "Hello, world!" 1(4IcIR5T;
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以下的语句在Quick BASIC中同样有效: OWmI$_L
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? "Hello,world!" _i0,?U2C
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BCPL lAx8m't}6
GET "LIBHDR" ]ov"&,J
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LET START () BE /^Zgv-n
$( 1$uO%
WRITES ("Hello, world!*N") tVAH\*a,/
$) |A:+[35
n}q/:|c
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Befunge WO{9S%ck
"!dlrow olleH">v .4,l0Nn`W
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C r`d.Wy Zj
#include <stdio.h> 98t|G5
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int main(void) PD@@4@^
{ GZNfx8zsY+
printf("Hello, world!\n"); w_^g-P[o-
return 0; FLOSdMYdw
} |PW.CV0,
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C++ Ed&M
#include <iostream> /N\[ C"8
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int main() ='GY:. N
{ .g95E<bd
std::cout << "Hello, world!" << std::endl; _;`g*Kx
return 0; >PK\bLEo
} >-<