“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。 P's <M
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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》。 \Y9=dE}
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以下是用不同语言写成的Hello World程序的几个例子: ~E^EF{h
Ada gx[#@(
with Ada.Text_Io; use Ada.Text_Io; M;MD-|U
procedure Hello is ?l,i(I
begin +bm2vIh$
Put_Line ("Hello, world!");
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end Hello; (p} N9n$
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汇编语言 }VR&*UJE
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x86 CPU,DOS,TASM BHj]w*Ov
MODEL SMALL dab>@z4
IDEAL },a|WL3^
STACK 100H `M>{43dj
](_(1
DATASEG ,h/0:?R
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HW DB 'Hello, world!$' U7crbj;c)d
any\}
CODESEG O8u"Y0$*w
MOV AX, @data 2|}p&~G(
MOV DS, AX \g4\a?i
MOV DX, OFFSET HW &s/aJgJhp
MOV AH, 09H |r-<t
INT 21H =X&h5;x'
MOV AX, 4C00H V2/+SvB2
INT 21H #<'/sqL
END N83RsL "}_
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x86 CPU,GNU/Linux,NASM 3"[ KXzn
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). LR)is
;Enter this into "hello.asm" then type: \yG_wZs
;"nasm -f elf hello.asm" f `Wfw3
;"ld hello.o -o hello" tu!u9jVv
;"./hello" 56<LMY|d
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section .data ;data section declaration Y_/Kd7,\~
msg db 'Hello World!',0AH `MTOe1
len equ $-msg ;string length n;rOH[P
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section .text ;code section declaration Kg](kP
global _start ;entry point (start of execution) i0AC.]4e"
_start: mov edx,len ;string length R&xD|w8UjM
mov ecx,msg ;string start /v!H{Zw=c
mov ebx,1 ;file handle: stdout D"x~bs?V\
mov eax,4 ;sys_write q }z,C{Wq<
int 80h ;kernel system call !Rb7q{@>
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mov ebx,0 ;return value %7|qnh6
mov eax,1 ;sys_exit 3b&W=1J
int 80h ;kernel system call Mx r#
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#s
x86 CPU,Windows,MASM32 +H<%)Lk J
.386 T!a8c<'V
.model flat,stdcall BK /;HG
option casemap:none v>R.M"f
;Include 文件定义 V)(pe #P
include windows.inc ]`4QJ;#
include user32.inc >8AtT=}w
includelib user32.lib 8dZH&G@;
include kernel32.inc zIAMM
includelib kernel32.lib '6WDs]\
;数据段 rLKDeB
.data WG}QLcP
szCaption db 'A MessageBox!',0 (u'/tNGS
szText db 'Hello,world!',0 s+CXKb +
;代码段 8c/Ii"1
.code nVM`&azD
start: 73<iK]*c
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK qJ!oH&/cD
invoke ExitProcess,NULL e5XikLu
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> x<3vA|o
end start AMm O+E?
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BEGIN { print "Hello, world!" } &GZR-/
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BASIC 9(PFd%
传统版BASIC(例如GWBASIC): k m|wB4
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10 PRINT "Hello, world!" kg@J.
20 END O71rLk;
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或在提示符输入: e.kt]l
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?"Hello, world!":END 6FmgK"t8
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现代版BASIC(例如Quick BASIC): ,Z^GN%Q7a
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Print "Hello, world!" Arv8P
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以下的语句在Quick BASIC中同样有效: t&uHn5
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? "Hello,world!" Dm^kuTIG
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BCPL $3Ia+O
GET "LIBHDR"
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LET START () BE 4>HGwk@+8
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WRITES ("Hello, world!*N") )5v .9N6v
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Befunge jdp:G
"!dlrow olleH">v sJlKN
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Brainfuck AVWrD[ wD2
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+++++++++++++++.>.+++.------.--------.>+.>. J_@4J7
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g <o ;\\
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#include <stdio.h> k
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int main(void) J;`~
!g
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printf("Hello, world!\n"); 4Ccb!?
return 0; A'8K^,<