“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。 {K^5q{u
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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》。 7e_4sxg'(3
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以下是用不同语言写成的Hello World程序的几个例子: JrP`u4f_
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with Ada.Text_Io; use Ada.Text_Io; b
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procedure Hello is _i=*0Q
begin 0s n$QmW:
Put_Line ("Hello, world!"); hf`y_H+\7
end Hello;
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汇编语言 ,!=
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x86 CPU,DOS,TASM ?QP>rm
MODEL SMALL \XDiw~0
IDEAL Hav &vV
STACK 100H B`SX3,3
ib,`0=0= O
DATASEG :ez76oGyc
HW DB 'Hello, world!$' y-pdAkDh
AD;m[u7
CODESEG G|cjI*
MOV AX, @data 0\mf1{$"!7
MOV DS, AX FSuC)Xg
MOV DX, OFFSET HW 175e:\Tw
MOV AH, 09H [s}W47N1
INT 21H (Mc{nFqS
MOV AX, 4C00H #}Qe{4L
INT 21H #JUh"8N'
END
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x86 CPU,GNU/Linux,NASM [8u9q.IZ
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). LWr YKi
;Enter this into "hello.asm" then type: *r.%/^@
;"nasm -f elf hello.asm" ch#)XomN
;"ld hello.o -o hello" Wvb ~j
;"./hello" D#nH g
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section .data ;data section declaration lz^Vi!|p
msg db 'Hello World!',0AH le:}MM
len equ $-msg ;string length EH".ki=e
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section .text ;code section declaration 5Q"yn2b4
global _start ;entry point (start of execution) ?;#Q3Y+
_start: mov edx,len ;string length 6+=_p$crMx
mov ecx,msg ;string start 8kK L=
mov ebx,1 ;file handle: stdout x@X2r
mov eax,4 ;sys_write =t N}4
int 80h ;kernel system call &n*ga$Q
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mov ebx,0 ;return value olv&K(-ccI
mov eax,1 ;sys_exit jd]L}%ax
int 80h ;kernel system call D)MFii1J~
0}GO$%l
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x86 CPU,Windows,MASM32 ;$tdn?|
.386 "9s}1C; Me
.model flat,stdcall 1<:5b%^c
option casemap:none 2fdN@iruB
;Include 文件定义 r'ilJ("
include windows.inc t!4 (a0\$F
include user32.inc *BxU5)O
includelib user32.lib }
e w{WD
include kernel32.inc $c*fbBM(&n
includelib kernel32.lib lP=,|xFra
;数据段 ;nl JD#
.data HFB>0<$
szCaption db 'A MessageBox!',0 -8)C6"V{
szText db 'Hello,world!',0 Q>[{9bI4QP
;代码段 >0 7i"a
.code -Tvnd,
start: ju:}%'
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK <e&v[
invoke ExitProcess,NULL R;,5LS&*a
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end start 'h ?
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BEGIN { print "Hello, world!" } g3s5ra[
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BASIC u;%~P 9O
传统版BASIC(例如GWBASIC): irh Z
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10 PRINT "Hello, world!" } A6z%|d
20 END :bo2H[U+
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或在提示符输入: /0`Eux\
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?"Hello, world!":END CVY-U|xFY
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现代版BASIC(例如Quick BASIC): Tb^1#O
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Print "Hello, world!" T&1-gswr:
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以下的语句在Quick BASIC中同样有效: |+~P; fG
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? "Hello,world!" Lcg1X3$G
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BCPL <`q-#-V@
GET "LIBHDR" }<z[t5
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LET START () BE 8~!h8bkC
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WRITES ("Hello, world!*N") (RUc>Qi
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Befunge /^i_tLgb
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, ?r$&O*;
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#include <stdio.h> qe uc^+P;
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int main(void) 1"l48NL L|
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printf("Hello, world!\n"); S>[&]
return 0; mt *Dx
} \ 6Y%z
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C++ gE23C*!'&:
#include <iostream> <UW-fI)X
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int main() Z1\=d =
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std::cout << "Hello, world!" << std::endl; ?R@u'4yK
return 0; pW<l9W
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C++/CLI X-yS9E
int main() ,_'Z Jlx
{ nI`9|W
System::Console::WriteLine("Hello, world!"); e=i9l
} wWJM./y
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