“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。 xqs ,4bcbY
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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》。 GXG 7P,p,
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以下是用不同语言写成的Hello World程序的几个例子: t'1g+g
Ada bFjH*~
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with Ada.Text_Io; use Ada.Text_Io;
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procedure Hello is ,oykOda:|
begin >dx/k)~~-L
Put_Line ("Hello, world!"); `*6|2
end Hello; e>6|# d
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汇编语言 X$e*s\4
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x86 CPU,DOS,TASM 3^[P
MODEL SMALL =^1jVaAL
IDEAL k3K*{"z
STACK 100H q
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DATASEG 4%2APvLW
HW DB 'Hello, world!$' , #=TputM
s_ t/
CODESEG C~egF=w
MOV AX, @data ? X6M8`
MOV DS, AX fLnwA|n=
MOV DX, OFFSET HW O}>@G
MOV AH, 09H l^Ob60)2
INT 21H 793 15A
MOV AX, 4C00H >TMd1?,
INT 21H }4N'as/ZO
END 8OKG@hc
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x86 CPU,GNU/Linux,NASM L&c
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;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). /{f"0]-RA
;Enter this into "hello.asm" then type: T%%
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;"nasm -f elf hello.asm" 9dq"x[
;"ld hello.o -o hello" }4p)UX>aWT
;"./hello" 8tQ;N'
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section .data ;data section declaration ?r KbL^2
msg db 'Hello World!',0AH 10fxK
len equ $-msg ;string length D'<L6w`
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section .text ;code section declaration ^R=`<jx
global _start ;entry point (start of execution) ;89kL]
_start: mov edx,len ;string length 8T1zL.u>q
mov ecx,msg ;string start VcGl8~#9
mov ebx,1 ;file handle: stdout vn+XY=Qnr
mov eax,4 ;sys_write gUNhN1=
int 80h ;kernel system call 4d\^
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mov ebx,0 ;return value +N=HI1^54R
mov eax,1 ;sys_exit "]#Ij6ml
int 80h ;kernel system call t5%cpkgh4
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x86 CPU,Windows,MASM32 9j|v
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.386 +@=V}IO
.model flat,stdcall yAfwQ$Ll7
option casemap:none tPQ|znB|
;Include 文件定义 r[4n2Mys
include windows.inc pd:7K'yaw
include user32.inc :~ pGHl
includelib user32.lib ]R_R`X?
include kernel32.inc Vf;&z$D{r
includelib kernel32.lib gzIx!sc
;数据段
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.data tsAV46S
szCaption db 'A MessageBox!',0 UxL*I[z5
szText db 'Hello,world!',0 rz@qW2
;代码段 &J)<1!|
.code 3Rc*vVnI
start: )[ A-d(y=
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK (iX8YP$ %
invoke ExitProcess,NULL !gve]>M
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> *{3d+j/?/
end start lG)wa
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BEGIN { print "Hello, world!" } Jqj!k*=/
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BASIC HEBeJ2w
传统版BASIC(例如GWBASIC): q7X#LY k
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10 PRINT "Hello, world!" @j^R+F
20 END #B;P4n3
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或在提示符输入: -g@!\{
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?"Hello, world!":END moM?aYm
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现代版BASIC(例如Quick BASIC): 7v*gwBH
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Print "Hello, world!" =vbG'_[7
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以下的语句在Quick BASIC中同样有效: 6nZ]y&$G-k
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? "Hello,world!" nF@**,C Q
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BCPL #7i*Diqf9
GET "LIBHDR" J,F1Xmr4
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LET START () BE fOV_ >]u
$( 4.!1odKp
WRITES ("Hello, world!*N") } ?j5V
$) B?! L~J@p
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Befunge ISGw}# }]?
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C )2&3D"V
#include <stdio.h> tm+*ik=x|
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int main(void) "'U^8NA2
{ 4>d4g\Z0L
printf("Hello, world!\n"); $G".PWc
return 0; aV\i3\da
} Vu3DP+u|i
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C++ 0k
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#include <iostream> Fi/iA%,
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int main() ^%r6+ey
{ J$#T_4 )
std::cout << "Hello, world!" << std::endl; &t=:xVn-M
return 0; \ %Mcvb.?
} 8!E.3'jb
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C++/CLI @G4Z
int main() |Xt.[1
{ Tn&