“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。 yW$ja|^E
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将Hello World程序作为第一个学写的程序,现在已经成为一种传统。该程序最早出现在由Brian Kernighan和Dennis Ritchie写的计算机程序设计教程《C语言程序设计》。 r3@Q(Rb
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以下是用不同语言写成的Hello World程序的几个例子: LWB"}#vt
Ada ]to"X7/
with Ada.Text_Io; use Ada.Text_Io; <(]e/}
procedure Hello is w>IYrSaa>
begin e#YQA
Put_Line ("Hello, world!"); _l&`*
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end Hello; KUdpOMYX
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汇编语言 ~h~K"GbC?
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x86 CPU,DOS,TASM H?M#7K~[
MODEL SMALL AQ!FJ(X(
IDEAL qIwI]ub~
STACK 100H 3 <V{.T
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DATASEG rx*1S/\PPc
HW DB 'Hello, world!$' $XqfwlUu/4
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CODESEG .EC/[fM
MOV AX, @data yJaQcGxE"
MOV DS, AX wl{Fx+<^3
MOV DX, OFFSET HW :<OInKE>Cx
MOV AH, 09H ?"p:6%GFz
INT 21H =?`5n|A*
MOV AX, 4C00H }}3*tn<6
INT 21H SWjOJjn
END 3U&QonCV
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x86 CPU,GNU/Linux,NASM lD!o4ZAo
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). $X%GzrN
;Enter this into "hello.asm" then type: }2.^n{Y
;"nasm -f elf hello.asm" APT'2-I_
;"ld hello.o -o hello" T/
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;"./hello" P!C!E/Jf5
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section .data ;data section declaration |H.(?!nTb
msg db 'Hello World!',0AH 8k$iz@e
len equ $-msg ;string length ,Ty>sZ#/fz
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section .text ;code section declaration D<[4}og&]
global _start ;entry point (start of execution) \A\a=A[
_start: mov edx,len ;string length xo0",i
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mov ecx,msg ;string start >Au]S`
mov ebx,1 ;file handle: stdout p~h=]o'i
mov eax,4 ;sys_write 4-`C !q
int 80h ;kernel system call =|n NC
jg?B][
mov ebx,0 ;return value Dg]ua5jk
mov eax,1 ;sys_exit W"fdK_F\
int 80h ;kernel system call )-824?Nl:
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x86 CPU,Windows,MASM32 H&65X
.386 . `lcxC
.model flat,stdcall =6t)-53
option casemap:none LSQ2pB2V
;Include 文件定义 E[J7FgU)<S
include windows.inc tr2@{xb
include user32.inc ]Au78Yom
includelib user32.lib f/9]o
include kernel32.inc &oevgG
includelib kernel32.lib 8jxgSB",
;数据段 dOq*W<%
.data w\pD'1e
szCaption db 'A MessageBox!',0 QQKvy0?1
szText db 'Hello,world!',0 Cw]Q)rX{
;代码段 :N#gNtC)b
.code \%9,<-~[
start: wobTT1!|
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK 9rX[z :
invoke ExitProcess,NULL z3b8
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> }io9Hk>|
end start "4LYqDe
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BEGIN { print "Hello, world!" } U]dz_%CRP
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BASIC pB{QO4qn
传统版BASIC(例如GWBASIC): z2og&|uT
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10 PRINT "Hello, world!" q>w@W:t Z
20 END #rzq9}9tB
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或在提示符输入: v\:>}
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?"Hello, world!":END Py6c=&*
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现代版BASIC(例如Quick BASIC): 0@1AH<
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Print "Hello, world!" 6}2vn5 E//
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以下的语句在Quick BASIC中同样有效: J0w[vrs&]
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? "Hello,world!" \`r5tQ r
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BCPL E0}`+x
GET "LIBHDR" [i.2lt#]
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LET START () BE GAbX.9[V
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WRITES ("Hello, world!*N") }4Lv-9s,
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Befunge {) 4D1
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#include <stdio.h> {FraM,w:
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int main(void) @DfjeS)u^
{
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printf("Hello, world!\n"); <r.f ?chf
return 0; iSo+6gu
} e2;19bj&
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C++ j/wG0~<kz
#include <iostream> \dCoY0Z ;
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int main() eI8^T?
{ H:4r6-{
std::cout << "Hello, world!" << std::endl; 4VSIE"8e
return 0; 3D+>NB
} 6T&6N0y+9
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C++/CLI &G5+bUF,
int main() %I;ej{*c
{ J6_Hlt
System::Console::WriteLine("Hello, world!"); gvYa&N
} $
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