“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。 aM(#J7;
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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》。 6-0sBB9=u
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以下是用不同语言写成的Hello World程序的几个例子: )tnbl"0
Ada 4y?n62N8$
with Ada.Text_Io; use Ada.Text_Io; C/#pK2xY
procedure Hello is 'Cz*p,
begin jD}h`(bE
Put_Line ("Hello, world!"); ?6{g7S%
end Hello; kS=nH9
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汇编语言 4>LaA7)v
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x86 CPU,DOS,TASM &;)B
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MODEL SMALL K~I?i/P=z
IDEAL dr+(C[=
STACK 100H vt^7:!r
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DATASEG lX)AbK]nb
HW DB 'Hello, world!$' k?TZY|_
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CODESEG _cj=}!I
MOV AX, @data hliO/3g
MOV DS, AX c$^v~lQS
MOV DX, OFFSET HW 1X5Yp |Ho
MOV AH, 09H NsSZ?ky
INT 21H l|E4 7@#
MOV AX, 4C00H 5J|S6x\
INT 21H v'b%m8
END N3aqNRwlk
@ =~k[o
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x86 CPU,GNU/Linux,NASM UB~-$\.
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). 9__B!vw:
;Enter this into "hello.asm" then type: 79@CO6
;"nasm -f elf hello.asm" B{D4.!a
;"ld hello.o -o hello" a:`<=^:4,
;"./hello" a$Y{ut0t(
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section .data ;data section declaration dcD#!v\0
msg db 'Hello World!',0AH &rD8ng+$
len equ $-msg ;string length D4|Ajeo;1
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section .text ;code section declaration "~._G5i.
global _start ;entry point (start of execution) {i?G:K
_start: mov edx,len ;string length ge.>#1f}
mov ecx,msg ;string start KK2YT/K$SG
mov ebx,1 ;file handle: stdout !4=_l6kg~+
mov eax,4 ;sys_write ^v'0\(H?P
int 80h ;kernel system call G.~Q2O#T
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mov ebx,0 ;return value !ehjLFS? _
mov eax,1 ;sys_exit 1iLo$
int 80h ;kernel system call 2IRARZ,3
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x86 CPU,Windows,MASM32 k{{3nenAG
.386 KV|D]}
.model flat,stdcall oy5K*
}
option casemap:none Skg/iH"(
;Include 文件定义 D&2NO/
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include windows.inc o{fYoBgr
include user32.inc U5H%wA['m
includelib user32.lib TK[[6IB
include kernel32.inc njg0MZBqA
includelib kernel32.lib `[(XZhN
;数据段 C$~ly=@
.data 1Q!^*D
szCaption db 'A MessageBox!',0 2EZ7Vdz2
szText db 'Hello,world!',0 n7K%lj-.P
;代码段 Q\
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.code ng9e)lU~*b
start: ]=%qm;
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK buN@O7\
invoke ExitProcess,NULL wv."
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> ^uN[rHZ*u
end start a{Y|`*7y
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BEGIN { print "Hello, world!" } [J}eNprg
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BASIC Q2r[^Z
传统版BASIC(例如GWBASIC): ;*j
K!
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10 PRINT "Hello, world!" r(uo-/7z
20 END oxN5:)
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或在提示符输入: K-#d1+P+
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?"Hello, world!":END BlU&=;#r5>
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现代版BASIC(例如Quick BASIC): lGWz
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Print "Hello, world!" RH<2f5-sC!
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以下的语句在Quick BASIC中同样有效: kBcTXl
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? "Hello,world!" 03v& k
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BCPL U\:Y*Ai
GET "LIBHDR" 3mAiz q3
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LET START () BE IAwS39B
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WRITES ("Hello, world!*N") d/OP+yzgZ
$) e3TKQ(
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Befunge S@u46 X>
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, p{LbTjdNc
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++++++++++[>+++++++>++++++++++>+++>+<<<<-]>++.>+.+++++++..+++.>++.<< xcWR#z{z
+++++++++++++++.>.+++.------.--------.>+.>. ]-{fr+
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C r[}nr H&8
#include <stdio.h> s)]T"87H'_
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int main(void) \}=T4w-e
{ W@r<4?Oat
printf("Hello, world!\n"); dX)aD
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return 0; |rk.t g9
} 06 %-tAq:
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C++ EMO{u
#include <iostream> N6-7RoA+
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int main() DoQ^caa@
{ ;6pB7N
std::cout << "Hello, world!" << std::endl; ):>?N`{V
return 0; k6ry"W3
} YAT@xZs-
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C++/CLI J+IItO4%
int main() f<