“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。 r7I
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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+?~;.i~
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以下是用不同语言写成的Hello World程序的几个例子: 6[?}6gQ
Ada sX:lE^)-z
with Ada.Text_Io; use Ada.Text_Io; XnXb&@Y
procedure Hello is 1V%'.l9
begin Wsm`YLYkt!
Put_Line ("Hello, world!"); bGv4.:)
end Hello; p4>,Fwy2
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汇编语言 Hr
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x86 CPU,DOS,TASM Vk7=7%xW
MODEL SMALL <4mQ*6
IDEAL g:gB`8w?
STACK 100H ^\wl2
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A1
DATASEG A/ 0qk
HW DB 'Hello, world!$' J_ J+cRwq
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CODESEG - DL"-%X.
MOV AX, @data +v15[^F
MOV DS, AX Q2\
MOV DX, OFFSET HW [rdsv
MOV AH, 09H ',mW`ZN
INT 21H S()Za@ [a$
MOV AX, 4C00H )|]Z>>%t
INT 21H )+Y&4Qu
END hI~SAd
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x86 CPU,GNU/Linux,NASM TnE+[.Qu
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). /F~X,lm*~
;Enter this into "hello.asm" then type: +R[4\ hC0Y
;"nasm -f elf hello.asm" J_xG}d
;"ld hello.o -o hello" 8A{6j
;"./hello" #WufZ18#
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section .data ;data section declaration 9?`RR/w
msg db 'Hello World!',0AH QzthTX<
len equ $-msg ;string length x /
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section .text ;code section declaration /EFq#+6
global _start ;entry point (start of execution) @@}`hii
_start: mov edx,len ;string length zvf3b!}
mov ecx,msg ;string start [7W(NeMk
mov ebx,1 ;file handle: stdout 77We;a
mov eax,4 ;sys_write UR3 $B%i
int 80h ;kernel system call o3h -=t
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mov ebx,0 ;return value q)iTn)Z!
mov eax,1 ;sys_exit X?dfcS*!n
int 80h ;kernel system call |}S1o0v{(a
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x86 CPU,Windows,MASM32 h<3p8eB
.386 J22r v(
.model flat,stdcall '29WscU
option casemap:none ;$!I&<)
;Include 文件定义 aWaw&u
include windows.inc Rd! 2\|
include user32.inc b5 Q NEi
includelib user32.lib Tsz
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include kernel32.inc jA`a/vWu
includelib kernel32.lib W_<4WG
;数据段 @"8R3BN
.data ty-
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szCaption db 'A MessageBox!',0 y/R+$h(%
szText db 'Hello,world!',0 0.DQO;
;代码段 K]"Kf{bx
.code Tf-CEHWD
start: <abKiXA"
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK }lfn0 %(@
invoke ExitProcess,NULL ~A >oO-0K
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> \ 4gXY$`@
end start t[2i$%NVM
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BEGIN { print "Hello, world!" } XO
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BASIC 1xTTJyoq
传统版BASIC(例如GWBASIC): YIOR$
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10 PRINT "Hello, world!" !F7: i
20 END )N)ljA3]
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或在提示符输入: hKksVi
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?"Hello, world!":END IJPgFZ7
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现代版BASIC(例如Quick BASIC): .,mPdVof
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Print "Hello, world!" AMTslo
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以下的语句在Quick BASIC中同样有效: J
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? "Hello,world!" `C'}e
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GET "LIBHDR" E5{n?e
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LET START () BE x!?Z*v@I
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WRITES ("Hello, world!*N") 2Xgx*'t\
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#include <stdio.h> b1=pO]3u
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int main(void) Wz{%"o
{ !K\itOEP-
printf("Hello, world!\n"); 8c).8RL f
return 0; mP!N<K
} ) `I=oB
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C++ T.@sq
#include <iostream> qLRE}$P
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int main() $ !5f"<FCB
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std::cout << "Hello, world!" << std::endl; (1 yGg==W.
return 0; ,n5a] )Dg
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int main() o<J5!
{ [&daG