“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。 jv W/M.q4
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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》。 ='~C$%
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以下是用不同语言写成的Hello World程序的几个例子: 2lQ'rnqS)
Ada rK];2[U
with Ada.Text_Io; use Ada.Text_Io; u+hzCCwtR
procedure Hello is R!:1{1
begin k+&| *!j
Put_Line ("Hello, world!"); %hY+%^k.
end Hello; na <g
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汇编语言 1<lLE1fk
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x86 CPU,DOS,TASM klPc l[.w
MODEL SMALL gX);/;9mm+
IDEAL U|,VH-#
STACK 100H ) ><{A
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DATASEG @}#$<6|
HW DB 'Hello, world!$' m|'TPy
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CODESEG S53[K/dZo
MOV AX, @data Nhs]U`s(g
MOV DS, AX &}rh+z
MOV DX, OFFSET HW r3#H]c
MOV AH, 09H Ry,jPw5<
INT 21H UeE&rA]
MOV AX, 4C00H `6UW?1_Z5
INT 21H 9hcZbM]
END \s[Uq
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x86 CPU,GNU/Linux,NASM UAa2oY&
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). 2uz<n}IV
;Enter this into "hello.asm" then type: \ B<(9
;"nasm -f elf hello.asm" lepgmQ|oY
;"ld hello.o -o hello" R(3V !ph
;"./hello" U1B5gjN
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section .data ;data section declaration je.mX /Lpj
msg db 'Hello World!',0AH JIDE]f
len equ $-msg ;string length +.{_n(kU
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section .text ;code section declaration Ip|7JL0Z
global _start ;entry point (start of execution) !qT.D:!@zF
_start: mov edx,len ;string length H+F'K
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mov ecx,msg ;string start EY':m_7W
mov ebx,1 ;file handle: stdout s(F^P
mov eax,4 ;sys_write a(!:a+9WOP
int 80h ;kernel system call &%rXRP
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mov ebx,0 ;return value SI U"cO4
mov eax,1 ;sys_exit s>^*GQw
int 80h ;kernel system call (Zx;GS
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x86 CPU,Windows,MASM32 R/U"]Rc
.386 tPc '#.
.model flat,stdcall u.R:/H<>~
option casemap:none OE WIP
;Include 文件定义 (V}DPA
include windows.inc s+9q:
include user32.inc g;Bq#/w
includelib user32.lib #NwlKZ-
include kernel32.inc 9w (QM-u
includelib kernel32.lib Rax}r
;数据段 3%>"|Ye}A
.data "C%;9_ig$
szCaption db 'A MessageBox!',0 o^2.&e+dQ
szText db 'Hello,world!',0
n~k;9`
;代码段 (yn!~El3
.code 'Q?nU^:F#
start: IKH#[jW'IB
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK i e%ZX
invoke ExitProcess,NULL qbpvTTF
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> U5%EQc-"P
end start lhKd<Y"
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BEGIN { print "Hello, world!" } UII R$,XB
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BASIC j8YMod=
传统版BASIC(例如GWBASIC): K>"M#T
Hi|'
10 PRINT "Hello, world!" %BC*h}KGH
20 END +kmPQdO;*/
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或在提示符输入: +(QGlRd
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?"Hello, world!":END A7 E*w
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现代版BASIC(例如Quick BASIC): }2-{4JIq}
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Print "Hello, world!" V.>'\b/#
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以下的语句在Quick BASIC中同样有效: ;XRLp:y
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? "Hello,world!" <G/O!02
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