“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。 M&f#wQ
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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》。 UOt8Q0)}
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以下是用不同语言写成的Hello World程序的几个例子: 5ITq?%{M
Ada ^)0 9OV+hF
with Ada.Text_Io; use Ada.Text_Io; 5kn+
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procedure Hello is |1Hc&
begin 0%
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Put_Line ("Hello, world!"); 8_a3'o%5
end Hello; `%=<R-/#7S
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汇编语言 qjAh6Q/E`
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x86 CPU,DOS,TASM .$0Pr%0pWI
MODEL SMALL C
) ?uE'
IDEAL Kt6>L5:94
STACK 100H c`jDW S
% O%xpSYr
DATASEG YB5dnS"n
HW DB 'Hello, world!$'
\bold"
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CODESEG ){ gAj
MOV AX, @data M{E{N K
MOV DS, AX NXI[q'y
MOV DX, OFFSET HW hcyO97@r
MOV AH, 09H .S7:;%qL6
INT 21H
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MOV AX, 4C00H [PWL<t::c
INT 21H 6/1$<!WH
END Pl78fs"L@
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x86 CPU,GNU/Linux,NASM 9i%9
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). wf9z"B
;Enter this into "hello.asm" then type: +EkW>$
;"nasm -f elf hello.asm" sV2iITFp
;"ld hello.o -o hello" #epy%>
;"./hello" ,2,5Odrz
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section .data ;data section declaration aWGon]2p
msg db 'Hello World!',0AH EB,4PEe:
len equ $-msg ;string length Q9sl fQ
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section .text ;code section declaration _kN*e:t
global _start ;entry point (start of execution) W&C-/O,m
_start: mov edx,len ;string length Gx'TkU=
mov ecx,msg ;string start Z 0*%Rq
mov ebx,1 ;file handle: stdout 3ZojE ux`
mov eax,4 ;sys_write <kbyZXV@K
int 80h ;kernel system call KOSQQf
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;`UecLb#
mov ebx,0 ;return value Yb:pAzw6
mov eax,1 ;sys_exit :(p)1=I
int 80h ;kernel system call r}W2 Ak\
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x86 CPU,Windows,MASM32 1mH\k5xu
.386 SlaDt
.model flat,stdcall CDdkoajBa
option casemap:none -^SA8y
;Include 文件定义 |/T43ADW
include windows.inc ?KP}#>Ba@
include user32.inc !w2gGy:I>
includelib user32.lib W^3;F1
include kernel32.inc 1@_T m
includelib kernel32.lib #/
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;数据段 ; Lql_1
.data *e/K:k
szCaption db 'A MessageBox!',0 XvKFPr0~
szText db 'Hello,world!',0 GwLFL.Ke
;代码段 o#D.9K(
.code GoE
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start: ^Z}Ob= .G
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK fn}UBzED\
invoke ExitProcess,NULL DtF}QvA
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> D7?C
end start P8I*dvu _
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BEGIN { print "Hello, world!" } }roG(
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BASIC I1"MPx{
传统版BASIC(例如GWBASIC): <Q5Le dN
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10 PRINT "Hello, world!" Cifd21v4
20 END I%lE;'x
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或在提示符输入: G>z,#Xt
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?"Hello, world!":END k6**u
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现代版BASIC(例如Quick BASIC): )=^w3y
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Print "Hello, world!" 9|WV~
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以下的语句在Quick BASIC中同样有效: OB^Tq~i
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? "Hello,world!" {9 PR()_
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BCPL kB
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GET "LIBHDR" <J{'o`{
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LET START () BE Tg
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$( f CcD&<%
WRITES ("Hello, world!*N") aT!;{+
$) ~;#MpG;e
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Befunge XFqJ 'R
"!dlrow olleH">v '0t-]NAc
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Brainfuck W/+K9S25
++++++++++[>+++++++>++++++++++>+++>+<<<<-]>++.>+.+++++++..+++.>++.<< Ru\_dr2yI}
+++++++++++++++.>.+++.------.--------.>+.>. kQv*eZ~
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C =
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#include <stdio.h> yL1bS|@
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int main(void) O#kq^C}
{ =VP=|g
printf("Hello, world!\n"); adO&