Az alábbi példákon nyomon követhetjük a
programozó szakmai fejlõdésének
állomásait. Lássuk tehát, hogyan
készíti el a klasszikus "Hello Word" programot,
életének különbözõ szakaszaiban:
10 PRINT "HELLO WORLD"
20 END
program Hello(input, output)
begin
writeln('Hello World')
end.
(defun hello
(print
(cons 'Hello (list 'World))))
#include <stdio.h>
void main(void)
{ char *message[] = {"Hello ", "World"};
int i;
for(i = 0; i< 2; ++i)
printf("%s", message[i]);
printf("\n");
}
#include <iostream.h>
#include <string.h>
class string
{
private:
int size;
char *ptr;
public:
string() : size(0), ptr(new char('\0')) {}
string(const string &s) : size(s.size)
{
ptr = new char[size + 1];
strcpy(ptr, s.ptr);
}
~string()
{
delete [] ptr;
}
friend ostream &operator <<(ostream &, const string &);
string &operator=(const char *);
};
ostream &operator<<(ostream &stream, const string &s)
{
return(stream << s.ptr);
}
string &string::operator=(const char *chrs)
{
if (this != &chrs)
{
delete [] ptr;
size = strlen(chrs);
ptr = new char[size + 1];
strcpy(ptr, chrs);
}
return(*this);
}
int main()
{
string str;
str = "Hello World";
cout << str << endl;
return(0);
}
[
uuid(2573F8F4-CFEE-101A-9A9F-00AA00342820)
]
library LHello
{
// bring in the master library
importlib("actimp.tlb");
importlib("actexp.tlb");
// bring in my interfaces
#include "pshlo.idl"
[
uuid(2573F8F5-CFEE-101A-9A9F-00AA00342820)
]
cotype THello
{
interface IHello;
interface IPersistFile;
};
};
[
exe,
uuid(2573F890-CFEE-101A-9A9F-00AA00342820)
]
module CHelloLib
{
// some code related header files
importheader(
#!/usr/local/bin/perl
$msg="Hello, world.\n";
if ($#ARGV = 0) {
while(defined($arg=shift(@ARGV))) {
$outfilename = $arg;
open(FILE, "" . $outfilename) || die "Can't write $arg: $!\n";
print (FILE $msg);
close(FILE) || die "Can't close $arg: $!\n";
}
} else {
print ($msg);
}
1;
#include
% cc -o a.out ~/src/misc/hw/hw.c
% a.out
% cat
Hello, world.
^D
10 PRINT "HELLO WORLD"
20 END
mail -s "Hello, world." bob@b12
Bob, tudnal nekem holnapra irni egy programot,
ami kiirja a kepernyore, hogy "Hello word"?
Koszi!
^D
% zmail jim
Delutanra szuksegem van egy "Hello Word" programra.
% letter
letter: Command not found.
% mail To: ^X
^F ^C
% help mail
help: Command not found.
% faszom!
!: Event unrecognized
% logout
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