“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。 o,yP9~8\
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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》。 a(BEm_l3
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以下是用不同语言写成的Hello World程序的几个例子: |MQ_VZ{6
Ada 8M&q
with Ada.Text_Io; use Ada.Text_Io; OPtFz6
procedure Hello is YLVZ]fN=>
begin wq@{85
Put_Line ("Hello, world!"); _)U[c;^6
end Hello; U&}v1wdZ3
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汇编语言 Pv3rDQ/Yt|
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x86 CPU,DOS,TASM pni*#W*n
MODEL SMALL @W+m;4 HH
IDEAL oFC]L1HN&
STACK 100H :,'yHVG\
H;.${u^lhd
DATASEG n
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HW DB 'Hello, world!$' Op2@En|d
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CODESEG #D2.RN
MOV AX, @data Q eZg l!
MOV DS, AX JsZLBq*lP
MOV DX, OFFSET HW oM~;du
MOV AH, 09H rOyKugHe
INT 21H (+w>hCI
MOV AX, 4C00H h.%)RW?
INT 21H ^^FqN;
END I"5VkeIx
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x86 CPU,GNU/Linux,NASM p}:"@6
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). CqkY_z
;Enter this into "hello.asm" then type: @7j$$
;"nasm -f elf hello.asm" sJ
!<qb5 !
;"ld hello.o -o hello" .WV5Gf)
;"./hello" %c"t`
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section .data ;data section declaration [d^ [Y:I'\
msg db 'Hello World!',0AH #vs=yR/tn{
len equ $-msg ;string length dPmtU{E<M
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section .text ;code section declaration )@,zG(t5;
global _start ;entry point (start of execution) qwomc28O
_start: mov edx,len ;string length >o_cf*nx
mov ecx,msg ;string start /nas~{B
mov ebx,1 ;file handle: stdout r;C
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mov eax,4 ;sys_write W~ i599!v
int 80h ;kernel system call $ctpg9 7
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mov ebx,0 ;return value 6Ex16
mov eax,1 ;sys_exit ,}jey72/k
int 80h ;kernel system call IB%Hv]
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x86 CPU,Windows,MASM32 QGoBugU
.386 %%h0 H[5*
.model flat,stdcall YM<F7tp4
option casemap:none J7Y lmi
;Include 文件定义 Bl1^\[#
include windows.inc 4u}jkd$]*
include user32.inc o_@6R"|
includelib user32.lib W#sCvI@
include kernel32.inc
*Q XUy
includelib kernel32.lib Y-fDYMm
;数据段 cf{rK`Ff^
.data iR39lOr
szCaption db 'A MessageBox!',0 mDX
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szText db 'Hello,world!',0 dZIruZ)x
;代码段 ,\^RyHg
.code ,E3Ze*(U
start: 57`*5X
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK YU6D;
invoke ExitProcess,NULL 9J4gDw4<
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> 55K(]%t
end start l1uv]t <
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BEGIN { print "Hello, world!" } \F5d
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BASIC Q35jJQ$<`
传统版BASIC(例如GWBASIC):
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10 PRINT "Hello, world!" Dxp.b$0t
20 END *h)|Ks
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或在提示符输入: A=bBI>GEYP
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?"Hello, world!":END oF {u
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现代版BASIC(例如Quick BASIC): D9/PVd
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Print "Hello, world!" |:)ARH6l#
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以下的语句在Quick BASIC中同样有效: _<m yM2z
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? "Hello,world!" \l71Q/y6u`
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BCPL 6)j/"9oY
GET "LIBHDR" qfS
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*)xjMTJ%
LET START () BE &{zRuF
$( i/{`rv*K[
WRITES ("Hello, world!*N") w6<zPrA
$) F$nc9x[S
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Befunge Qf.]Mw?Bm
"!dlrow olleH">v p|RFpn2ygF
, 6!$2nK+
^_@ (y!V0iy]
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Brainfuck ~Sc{\ZJl
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+++++++++++++++.>.+++.------.--------.>+.>. ?CSv;:
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#include <stdio.h> #CTeZ/g
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int main(void) =niT]xf
{ mT&?DZ9<
printf("Hello, world!\n"); 5"mH6%d :8
return 0; Un^3%=;
} qi=v}bp&
C|-QU
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C++ wS @-EcCB
#include <iostream> :O/QgGZN$
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int main() X6G2$|
{ }[b3$WZ
std::cout << "Hello, world!" << std::endl; D0VbD" y
return 0; 6`V~cVu
} d$#DXLA\P
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C++/CLI vNSeNS@jxC
int main() Ee097A?1vj
{ qj1Fj
System::Console::WriteLine("Hello, world!"); 1dl(`=^X
} aU?HIIA
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C# (C Sharp) >eucQ]
class HelloWorldApp ,HECHA_"
{ a2SXg A
public static void Main() :]uz0s`>
{ RI&V:1
System.Console.WriteLine("Hello, world!"); K %.>o
} ++Fv )KY@
} /y[zOT6
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COBOL I~)A!vp
IDENTIFICATION DIVISION. n#"N"6s
PROGRAM-ID. HELLO-WORLD. PsO>&Te