“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。
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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》。 ^<\} Y
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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&3#22z
Ada uq4sbkP
with Ada.Text_Io; use Ada.Text_Io; SrtVoe[
procedure Hello is qW~R-g]
begin cIvYfgIo9
Put_Line ("Hello, world!"); e=l5j"gq
end Hello; ~H|LWCU)K8
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汇编语言 _S2^;n?
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x86 CPU,DOS,TASM GR ?u?-
MODEL SMALL U|7Qw|I7
IDEAL |3:=qpT-
STACK 100H > &vO4L
/ =m9s
DATASEG Ws*PMK.0
HW DB 'Hello, world!$' bo;pj$eR3R
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CODESEG 46Q;F
MOV AX, @data 5o| !f
MOV DS, AX wUCDJY:,1
MOV DX, OFFSET HW :"P hkR
MOV AH, 09H 7ml0
INT 21H 4A/,X>W61
MOV AX, 4C00H %HF$
INT 21H NhoS7 y(
END fuD1U}c
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x86 CPU,GNU/Linux,NASM k,R~oSA'n
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). bEQtVe@`
;Enter this into "hello.asm" then type: @=0r3
;"nasm -f elf hello.asm" boF4d'g"
;"ld hello.o -o hello" {9Mdt`WL
;"./hello" 8gtCY~m
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section .data ;data section declaration H'0*CiHes
msg db 'Hello World!',0AH Kt90mA
len equ $-msg ;string length l?JO8^Nn
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section .text ;code section declaration 4 ?@uF[
global _start ;entry point (start of execution) S`c]Fc
_start: mov edx,len ;string length 7#9'2dI
mov ecx,msg ;string start 380->
mov ebx,1 ;file handle: stdout dI0bTw|s/
mov eax,4 ;sys_write [ lzy &To
int 80h ;kernel system call (>LHj]}K
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mov ebx,0 ;return value K"k"ml<4E
mov eax,1 ;sys_exit ]PzTl {]
int 80h ;kernel system call r$r&4dY
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x86 CPU,Windows,MASM32 {{]=zt|69
.386 /y](mu "!
.model flat,stdcall QK?2E
option casemap:none ?St=7a(D
;Include 文件定义 5{
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include windows.inc $uUb$8Bu
include user32.inc moVa'1ul
includelib user32.lib g;-+7ViIr
include kernel32.inc EK8E
includelib kernel32.lib :%uyy5AZ
;数据段 fa4951_
.data W\>^[c/
szCaption db 'A MessageBox!',0 HhWwc#B
szText db 'Hello,world!',0 ?|">),
;代码段 }+dM1 O
.code xV,4U/T
start: y/@;c)1b9
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK /+4^.Q*
invoke ExitProcess,NULL FU5LYXCs
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> lpfwlB'~9
end start r%TLv
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AWK V<HOSB7
BEGIN { print "Hello, world!" } AU\xNF3
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BASIC qP;{3FSkAF
传统版BASIC(例如GWBASIC): o0aO0Y
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10 PRINT "Hello, world!" 5DkK'tCI9Z
20 END )4!CR /ao
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或在提示符输入: Ko$ $dkSE
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?"Hello, world!":END NoJnchiU
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现代版BASIC(例如Quick BASIC): _Sly7_
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Print "Hello, world!" v7o?GQ75
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以下的语句在Quick BASIC中同样有效: A;fB6
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? "Hello,world!" #gX%X~w$F
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BCPL 1A%N0#_(Md
GET "LIBHDR" {k_ PMl0G
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LET START () BE [!J
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$( Q?
<-`7
WRITES ("Hello, world!*N") ?qf:_G
$)
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Befunge DA+A >5/
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Brainfuck c!\.[2n
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+++++++++++++++.>.+++.------.--------.>+.>. WZ^{zFoZ
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#include <stdio.h> /*u#Ba<<
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int main(void) C6K|:IK{
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printf("Hello, world!\n"); &