“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。 ph;ds+b
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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》。 6/Pw'4H9$
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以下是用不同语言写成的Hello World程序的几个例子: Ob"48{w$
Ada l*`2EJ
with Ada.Text_Io; use Ada.Text_Io; MY[QYBkn}
procedure Hello is ,'E+f%
begin Sl?@c/Ng
Put_Line ("Hello, world!"); m1mA:R\zM
end Hello; #BK3CD(&
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汇编语言 !G0OD$
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x86 CPU,DOS,TASM U;l!.mze
MODEL SMALL j~IX
IDEAL /R2K3E#
STACK 100H W.fsW<{4j
NZ}DbA+g;|
DATASEG =%O@%v
HW DB 'Hello, world!$' sSM^net0
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CODESEG t=IpVl!
MOV AX, @data S8{S b>
MOV DS, AX Dp5hr 8bT
MOV DX, OFFSET HW bP4<q?FKcN
MOV AH, 09H 'k?%39
INT 21H =Qa*-*
MOV AX, 4C00H %SHjJCS3
INT 21H yt+"\d
END )_vE"ryThA
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x86 CPU,GNU/Linux,NASM 01 vEt
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). J(%Jg
;Enter this into "hello.asm" then type: 9
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;"nasm -f elf hello.asm" Od?M4Ed(
;"ld hello.o -o hello" o:E_k#Fi
;"./hello" <K$X>&Ts
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section .data ;data section declaration 7~2/NU?
msg db 'Hello World!',0AH O[tOpf@s.
len equ $-msg ;string length ]Tb ?k+a
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section .text ;code section declaration JwkMRO
global _start ;entry point (start of execution) 7(q EHZEr
_start: mov edx,len ;string length WxN@&g(
mov ecx,msg ;string start rW~hFSrV[o
mov ebx,1 ;file handle: stdout zSpL^:~
mov eax,4 ;sys_write Jj~c&LxrO
int 80h ;kernel system call yK$.wd2,
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mov ebx,0 ;return value 7nzNBtk
mov eax,1 ;sys_exit cVg!"
int 80h ;kernel system call Eagl7'x
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x86 CPU,Windows,MASM32 k3-'!dW<
.386 ;oKN 8vI#7
.model flat,stdcall :f~[tox
option casemap:none IsaL+elq|
;Include 文件定义 5eZ8$-&([
include windows.inc DP(JsZ}
include user32.inc !L+4YA
includelib user32.lib Z/|oCwR
include kernel32.inc M!{;:m28X!
includelib kernel32.lib O3?3XB> <
;数据段 hU:M]O0uw
.data 7+,6m!4
szCaption db 'A MessageBox!',0 (-RZ|VdYg
szText db 'Hello,world!',0 y5td o'Ex
;代码段 sd@JQ%O
.code 2WP73:'t
start: i.|zKjF'
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK '^TQ Ubw
invoke ExitProcess,NULL y?ps+ce93
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> OZ/P@`kN.f
end start Pl@3=s!~>~
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BEGIN { print "Hello, world!" } *1}UK9X;
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BASIC ,[64$=R8
传统版BASIC(例如GWBASIC): Ya#,\;dTT
6' 9ITA
10 PRINT "Hello, world!" o3_dHbdI
20 END 9q?\F
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或在提示符输入: 'nK(cKDIG
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?"Hello, world!":END )FNvtLZ
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现代版BASIC(例如Quick BASIC): /[[_}\xI%
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Print "Hello, world!" i\2d1Z
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以下的语句在Quick BASIC中同样有效: uxGY/Zf
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? "Hello,world!" 5hVp2w-
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BCPL C^}2::Qu
GET "LIBHDR" c.-/e u^|
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LET START () BE R]0p L
$( YLr<^G-v
WRITES ("Hello, world!*N") aV^wTs#2I
$) 8Z=d+}Gg<
//SH=>w2
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Befunge T-0[P;
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C \DP*?D_}?
#include <stdio.h> )c'5M]V
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int main(void) Tgpf0(
{ j,q8n`@
printf("Hello, world!\n"); =j%B`cJ66_
return 0; 9<0p1W O
} .hYrE5\-
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C++ LX%K*nlj
#include <iostream> J 3oEN'8S
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int main() <