“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。 &B3kzs
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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》。 PffwNj/l
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以下是用不同语言写成的Hello World程序的几个例子: sC}/?^q
Ada \t1vYIY]T
with Ada.Text_Io; use Ada.Text_Io; {jv1hKTa
procedure Hello is m4%m0"Z
begin CZ0 {*K:
Put_Line ("Hello, world!"); Rc6Rk!^
end Hello; a'A0CQ
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汇编语言 3;Xs`dk
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x86 CPU,DOS,TASM N*z<VZ
MODEL SMALL 5Q^~Z},
IDEAL L,:U _\HQ
STACK 100H 6Z'zB&hM}
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DATASEG qVY\5`f@
HW DB 'Hello, world!$' =6 [!'K
3C[ ;2
CODESEG mki=.l$O
MOV AX, @data 5jV]{ZV#
MOV DS, AX /
)EB~|4']
MOV DX, OFFSET HW 7eq;dNB@gq
MOV AH, 09H ROfmAc
INT 21H 4@VX%5uy
MOV AX, 4C00H weDv[b5i
INT 21H a RV!0?fS
END D2hvf^g'*
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x86 CPU,GNU/Linux,NASM P_Zo}.{
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). ^8\pJg_0
;Enter this into "hello.asm" then type: InDR\=o
;"nasm -f elf hello.asm" w gufk{:
;"ld hello.o -o hello" 'z\F-Ttq
;"./hello" ar{e<&Bny
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section .data ;data section declaration I?:V EN:
msg db 'Hello World!',0AH 1"k
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len equ $-msg ;string length 44]ae~@a
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section .text ;code section declaration 2<'gX>TW
global _start ;entry point (start of execution) ' ZB%McS
_start: mov edx,len ;string length 7z$+ *]9-
mov ecx,msg ;string start Fl
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mov ebx,1 ;file handle: stdout ]F_u
mov eax,4 ;sys_write [IYs4Y5
int 80h ;kernel system call k82'gJ;MC=
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mov ebx,0 ;return value ;P{ *'@
mov eax,1 ;sys_exit JAn3
int 80h ;kernel system call 4Pt0^;H&jn
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.=NK^
x86 CPU,Windows,MASM32 {Cd*y6lI
.386 kn<[v;+
.model flat,stdcall .h6h&[TEU
option casemap:none F8k1fmM]Y
;Include 文件定义 i7p3GBXh[
include windows.inc -8TLnl~[
include user32.inc }{ P}P}
includelib user32.lib .d*v fE$
include kernel32.inc ZE1#{u~[y
includelib kernel32.lib rUuM__;d
;数据段 f&,.h"bS
.data CR_A{(
szCaption db 'A MessageBox!',0 QTDI^ZeuF
szText db 'Hello,world!',0 R{WG>c
;代码段 AvwX 2?tc
.code :jhJpm1Xq
start: 's9)\LS>p
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK y<gmp
invoke ExitProcess,NULL Q[k}_1sWs$
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> |5W u0T
end start K4
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AWK ?>w%Lg{L}
BEGIN { print "Hello, world!" } 68D.Li
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BASIC p3-sEIw}Ru
传统版BASIC(例如GWBASIC): 5bAy@n
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10 PRINT "Hello, world!" .NPai4V'
20 END P!-9cd1C,
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或在提示符输入: U>{z*D
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?"Hello, world!":END =T+<>/[
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现代版BASIC(例如Quick BASIC): 8J>s|MZ
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Print "Hello, world!" 6.k2,C4dT<
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以下的语句在Quick BASIC中同样有效: YUc&X