“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。 Dp6"I!L<|
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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》。 4a \+o]
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以下是用不同语言写成的Hello World程序的几个例子: vls> 6h
Ada Vq7
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with Ada.Text_Io; use Ada.Text_Io; b!HFv;^N
procedure Hello is rMFZ#38d
begin wkpVX*DfRE
Put_Line ("Hello, world!"); C`_D{r
end Hello; -Jrc'e4K
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汇编语言 ziGL4c0p
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x86 CPU,DOS,TASM d@4=XSj
MODEL SMALL cWy0N
IDEAL Cv7RCjMw
STACK 100H %|* y/m
C)^\?DH
DATASEG ;B7|tajd
HW DB 'Hello, world!$' ] "vdC}
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CODESEG +hhbp'%
MOV AX, @data D.x3@+
MOV DS, AX ct/THq
MOV DX, OFFSET HW +Ws}a
MOV AH, 09H W&[9x%Ba
INT 21H }4`YdN
MOV AX, 4C00H #{`NJ2DU]
INT 21H a#**96Av
END 8(K~QvE~
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x86 CPU,GNU/Linux,NASM S?WUSx*N
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). EqwA8?M
;Enter this into "hello.asm" then type: p)]^>-L
;"nasm -f elf hello.asm" >%A=b}VS
;"ld hello.o -o hello" iU|C<A%Hh
;"./hello" -0){C|,6
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section .data ;data section declaration goWt!,&f
msg db 'Hello World!',0AH KDzIarC
len equ $-msg ;string length JsdEA
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section .text ;code section declaration ~$Yuxo
global _start ;entry point (start of execution) "K]4j]yU
_start: mov edx,len ;string length |0Kt@AJY
mov ecx,msg ;string start 9$t@Gmn
mov ebx,1 ;file handle: stdout @72G*u\Wz
mov eax,4 ;sys_write
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int 80h ;kernel system call '?[msX"aqa
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mov ebx,0 ;return value V6o,}o&-
mov eax,1 ;sys_exit 3*L,48wX
int 80h ;kernel system call WV5R$IqY
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x86 CPU,Windows,MASM32 *9 xD]ZZF
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.model flat,stdcall ENr&k(>0HQ
option casemap:none w-m2N-"='
;Include 文件定义 U^S0H(>
include windows.inc P#]jPW
include user32.inc q2Dg~et
includelib user32.lib pgarGaeq
include kernel32.inc fz\Az-
includelib kernel32.lib :I8t}Wg
;数据段 LNWp$"
.data @A%`\Ea%
szCaption db 'A MessageBox!',0 ny0`~bl{p
szText db 'Hello,world!',0 0Oq1ay^
;代码段 G%{jU'2
.code bzTM{<]sv
start: UKdzJEhG
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK sP#5l @
invoke ExitProcess,NULL !cZIoz
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> )XWL'':bF
end start z%z$'m
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BEGIN { print "Hello, world!" } lwlR"Z
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传统版BASIC(例如GWBASIC): qp8;=Nfa
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10 PRINT "Hello, world!" n/-I7Q!;u
20 END @,hvXl-G *
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或在提示符输入: 5 X rn]
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?"Hello, world!":END \4DH&gZ[
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现代版BASIC(例如Quick BASIC): kE1u-EA
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Print "Hello, world!" xE:p)B-]
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以下的语句在Quick BASIC中同样有效: 6Yu8ReuL
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? "Hello,world!" %NuS!v>
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GET "LIBHDR" 2Ig.hnHj
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LET START () BE Q[ IaA"
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WRITES ("Hello, world!*N") 9ItsK
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#include <stdio.h> I~Ziq10
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int main(void) /Ue~W,|
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printf("Hello, world!\n"); 4Xlq
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return 0; a
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}
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