“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。 P} 0%-JC
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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》。 J|~MC7#@q
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以下是用不同语言写成的Hello World程序的几个例子: hRUhX[
Ada {(r`k;fB
with Ada.Text_Io; use Ada.Text_Io; 6)Y.7 XR
procedure Hello is X]wRwG
begin 3'cE\u
Put_Line ("Hello, world!"); ]pH-2_
end Hello; %M7` Hwu
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汇编语言 0{,Z{&E
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x86 CPU,DOS,TASM (Iaf?J5{
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DATASEG r76J
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HW DB 'Hello, world!$' l'/R&`-n
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CODESEG xKuRh}^K
MOV AX, @data 8 ~J(](QA
MOV DS, AX @zU6t|mhz
MOV DX, OFFSET HW .J)I | '
MOV AH, 09H 6W]9$n\"?
INT 21H M%2+y5
MOV AX, 4C00H ?0v-qj+
INT 21H NbgK@eV}+{
END i{`FmrPO~
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x86 CPU,GNU/Linux,NASM P<X\%_Iat
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). n1ly
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;Enter this into "hello.asm" then type: G9xmmc
;"nasm -f elf hello.asm" :6vm+5!
;"ld hello.o -o hello" 4^WpS/#4
;"./hello" Xq_5Qv
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section .data ;data section declaration 3%E }JU?MM
msg db 'Hello World!',0AH +a^nlW9g
len equ $-msg ;string length }o(zj=7
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section .text ;code section declaration PIu1+k.r?
global _start ;entry point (start of execution) yku5SEJ\
_start: mov edx,len ;string length 0
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mov ecx,msg ;string start 62k^KO6Y
mov ebx,1 ;file handle: stdout a
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mov eax,4 ;sys_write JtEo'As:[
int 80h ;kernel system call 1IC~e^"
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mov ebx,0 ;return value T
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mov eax,1 ;sys_exit 6p?,(
int 80h ;kernel system call d1AioQ9
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x86 CPU,Windows,MASM32 *K|W
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.model flat,stdcall eg(6^:z?f
option casemap:none eJxw)zd7
;Include 文件定义 qf!p 9@4F[
include windows.inc YH vLGc%
include user32.inc ^p[rc@+
includelib user32.lib ?OcJ)5C4
include kernel32.inc $Tu61zq
includelib kernel32.lib iV'k}rXC
;数据段 N/%WsQp
.data pGJ>O/%
szCaption db 'A MessageBox!',0 uE%r/:!k4$
szText db 'Hello,world!',0 ([SU:F!uW(
;代码段 }001K
.code bCo7*<I4
start: fZ0M%f
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK =G7m)!
invoke ExitProcess,NULL cq}EZ@ .
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> `A w^H!
end start .
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BEGIN { print "Hello, world!" } B*
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BASIC Fq|Ni$
传统版BASIC(例如GWBASIC): z\K"Rg~J
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10 PRINT "Hello, world!" ;j[>9g
20 END lR )67a
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或在提示符输入: |bTPtrT8
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?"Hello, world!":END ZA0mz 65
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现代版BASIC(例如Quick BASIC): 63\/ *
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Print "Hello, world!" W>) M5t4i
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以下的语句在Quick BASIC中同样有效: 5gYRwuf
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? "Hello,world!" 0z1ifg&
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BCPL J!c)s!`w
GET "LIBHDR" $xzAv{
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LET START () BE b*a#<K$T_
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WRITES ("Hello, world!*N") S\:P-&dC
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Befunge l4F%VR4KT
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#include <stdio.h> +O8%Hm
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int main(void) !hJ+Lp_
{ ]D?"aX'q>
printf("Hello, world!\n"); ")SFi^]
return 0; T1 ut"Zu
} KI)M JG:t
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C++ 5x5@t
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#include <iostream> #eoome2Q
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int main() Px4)>/ z,
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std::cout << "Hello, world!" << std::endl; }JF13beU
return 0; 3
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} \nXtH}9ZF
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int main() IdzxS
{ &TUWW