“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。 X^?|Sz<^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》。 s!nSE
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以下是用不同语言写成的Hello World程序的几个例子: h^.tomg8
Ada < e7<t9
with Ada.Text_Io; use Ada.Text_Io; `\WcF7
procedure Hello is UH1S_:6
begin 2l\D~ y
Put_Line ("Hello, world!"); RGx]DP$5G
end Hello; R
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汇编语言 YokZar2a0
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x86 CPU,DOS,TASM =2vMw]
MODEL SMALL )Yy#`t
IDEAL 3& fIO
STACK 100H n'0$>Q
Npf7 p
DATASEG 1b
%T_a
HW DB 'Hello, world!$' uZ=UBir
%FR^[H]
CODESEG 6|"!sW`%N
MOV AX, @data 3_jCsX
MOV DS, AX 08d_DCR
MOV DX, OFFSET HW *]E7}bqb
MOV AH, 09H F`ZIc7(.{
INT 21H r%m7YwXo
MOV AX, 4C00H SceCucT
INT 21H yBD2
END =p&'_a^$
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x86 CPU,GNU/Linux,NASM [K4+G]6
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). rO?x/{;ai
;Enter this into "hello.asm" then type: $bi_i|?
;"nasm -f elf hello.asm" D@4&@>
;"ld hello.o -o hello" ~b6<uRnM.
;"./hello" kvgs $
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section .data ;data section declaration 7N59B z
msg db 'Hello World!',0AH dD.d?rnZq7
len equ $-msg ;string length uZiY<(X
gt t$O
section .text ;code section declaration w#G=Z_Tt
global _start ;entry point (start of execution) _AFt6\
_start: mov edx,len ;string length eDM0417O(
mov ecx,msg ;string start ";S*[d.2tA
mov ebx,1 ;file handle: stdout =`\,2Nb
mov eax,4 ;sys_write b[[6X
int 80h ;kernel system call >2Qqa;nx|
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mov ebx,0 ;return value (P>eWw\0
mov eax,1 ;sys_exit o"ah\"#el
int 80h ;kernel system call ~ Dp:j*H
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x86 CPU,Windows,MASM32 L..X)-D2n
.386 `2(R}zUHN
.model flat,stdcall D"] [&m
option casemap:none `2mbF^-4
;Include 文件定义 ZAM+4#@
include windows.inc +S5_J&~
include user32.inc M}oFn}-T9a
includelib user32.lib )x:j5{>(
include kernel32.inc tj^:SW.0
includelib kernel32.lib ox=7N{+`J
;数据段 F)5B[.ce
.data i(f;'fb*
szCaption db 'A MessageBox!',0 j.'"CU
szText db 'Hello,world!',0 \`p~b(
;代码段 cJWfLD>2_!
.code v.LUK
start: wAOVH].
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK nM.?Q}yO~
invoke ExitProcess,NULL Nj-rZ%&
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> c.{&~
end start Nb!6YY=Ez-
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BEGIN { print "Hello, world!" } PUZXmnB
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BASIC rWfurB5f
传统版BASIC(例如GWBASIC):
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10 PRINT "Hello, world!" rUpAiZfz >
20 END ?M-8Fp3 +
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或在提示符输入: #M^Yh?~%w
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?"Hello, world!":END *;yMD-=
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现代版BASIC(例如Quick BASIC): Nl<,rD+KSD
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Print "Hello, world!" 7RFkHME
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以下的语句在Quick BASIC中同样有效: p>tdJjnt
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? "Hello,world!" $F()`L{Tj
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BCPL 0#/
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GET "LIBHDR" $z,DcO.vz
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LET START () BE 1LIV/l^}f
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WRITES ("Hello, world!*N") v_h*:c
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Befunge EM
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C htrj3$q(4
#include <stdio.h> 6SO7iFS
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int main(void) +*{5ORq=
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printf("Hello, world!\n"); [IBk-opap
return 0; *`.{K12T
} AR6vc
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C++ X3O$Sd(D
#include <iostream> Z2jb>%
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int main() aB!Am +g
{ Hll}8d6[
std::cout << "Hello, world!" << std::endl; ZKPkx~,U[
return 0; S)|b%mVwR
} =T4w:
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