“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。 U_x0KIm
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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》。 v#<\:|XAg
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以下是用不同语言写成的Hello World程序的几个例子: =MTj4VXh"
Ada <#xrrRhm}
with Ada.Text_Io; use Ada.Text_Io; e1%rVQ(v
procedure Hello is Job/@> ;
begin M8 iEVJ
Put_Line ("Hello, world!"); >.J'L5
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end Hello; n 5~=qQK2
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汇编语言 *nYB o\@g
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x86 CPU,DOS,TASM OM20-KDc5
MODEL SMALL gI)w^7Gi
IDEAL kF+ZW%6N
STACK 100H ra]!4Kd'
Q&u>7_, Du
DATASEG Az
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HW DB 'Hello, world!$' '"`
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CODESEG lir&e
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MOV AX, @data D3%l4.h
MOV DS, AX tgO+*q5B
MOV DX, OFFSET HW PSW#^o
MOV AH, 09H R'G'&H{N
INT 21H 0fnZR$PB
MOV AX, 4C00H } c{Fa&
INT 21H + jp|Y?6Z
END gWFL
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x86 CPU,GNU/Linux,NASM 5{')GTdX>
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). "w*@R8v
;Enter this into "hello.asm" then type: TkA9tFi
;"nasm -f elf hello.asm" \4OK!6LkI
;"ld hello.o -o hello" 7 ,$ axvLw
;"./hello" R `;o!B}[
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section .data ;data section declaration k?^%hO>[
msg db 'Hello World!',0AH ;xSRwSNDi(
len equ $-msg ;string length >4Iv[ D1
j: <t
section .text ;code section declaration q^u1z|'Z
global _start ;entry point (start of execution) Lb!r(o>8Cb
_start: mov edx,len ;string length U8YO0}_z
mov ecx,msg ;string start kfVZ=`p}
mov ebx,1 ;file handle: stdout Qqp)@uM^
mov eax,4 ;sys_write rwoF}}
int 80h ;kernel system call q1UBKhpnH
--Oprl
mov ebx,0 ;return value }W1^t
mov eax,1 ;sys_exit /M 0 p_4
int 80h ;kernel system call u/} xE7G
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j\!
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x86 CPU,Windows,MASM32 @|^jq
.386 Z%Vr+)!4
.model flat,stdcall DX|uHbGg
option casemap:none pw!@Q?R
;Include 文件定义 {n\6BTs
include windows.inc 'w}p[(
include user32.inc ;JYoW{2
includelib user32.lib m6-76ma,hi
include kernel32.inc NvcHv7,
includelib kernel32.lib 9KXym }
;数据段 /;DjJpwf0
.data ^,Xa IP+[
szCaption db 'A MessageBox!',0 60'6/3
szText db 'Hello,world!',0 _~PO
;代码段 s){Q&E~X
.code 7O:"~L
start: 5KK{%6#f\
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK "rVU4F)
invoke ExitProcess,NULL T4eWbNSs
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> THJ
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end start ~fBex_.o*
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BEGIN { print "Hello, world!" } Q]/B/
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传统版BASIC(例如GWBASIC): #7+]%;h
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10 PRINT "Hello, world!" WI6(#8^p
20 END >ZX|4U[$P
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或在提示符输入: q=njKC
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?"Hello, world!":END |IAW{_9)U
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现代版BASIC(例如Quick BASIC): +uELTHH=
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Print "Hello, world!" ^eobp.U
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以下的语句在Quick BASIC中同样有效: C*a,<`
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? "Hello,world!" $}db /hY*
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GET "LIBHDR" +ZX.1[O
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LET START () BE I
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WRITES ("Hello, world!*N") Y_+
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Befunge ac|/Y$\w
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#include <stdio.h> JDKLKHOMZ
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int main(void) 7/
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{ {<!hlB
printf("Hello, world!\n"); %P;[fJ
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return 0; Tv1]v.
} ;5N41_hG
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C++ ncj!KyU
#include <iostream> W/=7jM
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