“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。 z#BR5jF
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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》。 m]i @ +C
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以下是用不同语言写成的Hello World程序的几个例子: 3(C\.oRc
Ada DCqY|4Qc
with Ada.Text_Io; use Ada.Text_Io; .ERO|$fv
procedure Hello is Ookh<ES>
begin f&v9Q97=
Put_Line ("Hello, world!"); 9zYVC[o
end Hello;
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汇编语言 X7k.zlH7T
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x86 CPU,DOS,TASM N?Lb
MODEL SMALL >pUtwIP
IDEAL BIuK @$
STACK 100H \%UkSO\nO3
V#VN%{
DATASEG UAoh`6vFF8
HW DB 'Hello, world!$' )K &(
MSf;ZB
CODESEG KYzv$oK
MOV AX, @data F:x [
MOV DS, AX .r*2|
MOV DX, OFFSET HW z5ij(RE]
MOV AH, 09H H":oNpfb
INT 21H %*BlWk!Q
MOV AX, 4C00H 4apL4E"r
INT 21H vpmj||\-
END .\>v0Du
MEB it
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x86 CPU,GNU/Linux,NASM [eTSZjIN7
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). U&O:
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;Enter this into "hello.asm" then type: L3CP`cx
;"nasm -f elf hello.asm" '7O3/GDK
;"ld hello.o -o hello" vVOh3{e|
;"./hello" 13taFVdU
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section .data ;data section declaration 1GzAG;UUo6
msg db 'Hello World!',0AH ,v"YqD+GC5
len equ $-msg ;string length 6Ybg^0m
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section .text ;code section declaration W6Y]N/v3>
global _start ;entry point (start of execution) yPq'( PV
_start: mov edx,len ;string length AK@9?_D
mov ecx,msg ;string start /Rl6g9}
mov ebx,1 ;file handle: stdout 3Z1CWzq(
mov eax,4 ;sys_write
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int 80h ;kernel system call ` V##Y
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mov ebx,0 ;return value 41&\mx
mov eax,1 ;sys_exit p,#o<W
int 80h ;kernel system call P&f7@MOV.P
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x86 CPU,Windows,MASM32 %7|9sQ:
.386 `nu''B
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.model flat,stdcall FJMrs[
option casemap:none \-g)T}g,I
;Include 文件定义 .mR8q+I6
include windows.inc <7~'; K
include user32.inc q<M2,YrbAI
includelib user32.lib nrjE.+v
include kernel32.inc a|X a3E
includelib kernel32.lib /'/Xvm3
;数据段 &v@a5 L
.data LGn:c;
szCaption db 'A MessageBox!',0 }4,L%$@n
szText db 'Hello,world!',0 'dn]rV0(C
;代码段 DMO Mh#[
.code 2'w?\{}D
start: \.-bZ$
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK gw!vlwC&T
invoke ExitProcess,NULL w(L4A0K[
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> :>5@cvc
end start q#%xro>m
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BEGIN { print "Hello, world!" } {e 14[0U-
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BASIC vw9@v` k
传统版BASIC(例如GWBASIC): M!o##* *`
a^I\ /&aw'
10 PRINT "Hello, world!" LcTP#
20 END #"G]ke1l$
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或在提示符输入: {N+$Q'
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?"Hello, world!":END #AJM6* G9
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现代版BASIC(例如Quick BASIC): %V7at7>o
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Print "Hello, world!" EFM5,gB.m
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以下的语句在Quick BASIC中同样有效: ,
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? "Hello,world!" J cd-
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BCPL Wi)_H$KII
GET "LIBHDR" .[ICx
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LET START () BE Hquc
o
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WRITES ("Hello, world!*N") Hx?;fl'G%
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Befunge VAHh~Q6 ;e
"!dlrow olleH">v 5@~
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