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C++ Question.

 
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Pseudo Xero
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PostPosted: Wed Aug 22, 2007 1:23 am    Post subject: C++ Question. Reply with quote
Blegh, started C++ not too long ago.
Only problem is I don't know how to use a if command to see if the user input == "somestring".
I already know how to use the if command in general, but I get compiling errors if I use if (inputvariable == "something") {.

It might be something simple... but i couldn't find anything about it on google. Neutral

Thanks...
By the way, I'm using Visual C++ 6.
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can't VB do anything??
windows is programmed using VB right? correct me if im wrong.

so all things in windows you have like the start menu is a windows form too.
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Robotex
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PostPosted: Wed Aug 22, 2007 3:04 am    Post subject: Reply with quote
if(!strcmp(a1,a2))
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Pseudo Xero
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PostPosted: Wed Aug 22, 2007 3:50 am    Post subject: Reply with quote
Robotex wrote:
if(!strcmp(a1,a2))

Thanks.
eh, I don't really get strcmp...
I haven't noticed any bad habits, but might be because of a previous language I learned. Surprised

Here's the code I have, obviously there's compiling errors...
Code:
#include <iostream>
#include <stdio.h>
#include <string.h>
using namespace std;
int main ()
{
   char *a1 = Input
   char *a2 = "k\o!}RmR=944QuzpFd~@`{fDF7n3g{A-"
      int Input
  cout << "Password: ";
  cin >> Input;
  if (!strcmp(a1, a2)) {
     cout << "Correct password...\n";
  else
     cout << "Wrong password, try again...\n";
  }
  return 0;
}

Anyone mind putting me in the right direction? Razz
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haxory' wrote:
can't VB do anything??
windows is programmed using VB right? correct me if im wrong.

so all things in windows you have like the start menu is a windows form too.
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Jani
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PostPosted: Wed Aug 22, 2007 4:07 am    Post subject: Reply with quote
Using std::string allows you to do "if" compares.

Code:
#include <iostream>
#include <string>

int main(int argc, char* argv[])
{
  std::string input;
  std::string compare("asdasd");

  std::getline(std::cin, input);

  if(input==compare)
    std::cout << "Hurray!" << std::endl;
  else
    std::cout << "Blah." << std::endl;

  return EXIT_SUCCESS;
}
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TheSorc3r3r
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PostPosted: Wed Aug 22, 2007 7:56 am    Post subject: Reply with quote
you don't need to use std::string to compare strings.

xenephobe, you're forgetting semicolons, you can't declare a string without "".

Code:
#include <stdlib.h>
#include <iostream>
using namespace std;

int main()
{
   char input[256];
   cout << "Password pl0x: ";
   cin >> input;
   if (!strcmp(input, "asdasd")) cout << "Good job!\n";
   else cout << "Faiil\n";
   cin.get();
   return 0;
}
something like that
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Jani
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PostPosted: Wed Aug 22, 2007 8:19 am    Post subject: Reply with quote
TheSorc3r3r wrote:
you don't need to use std::string to compare strings.
Sigh. I wasn't saying that you need 'em, but you can use 'em.

IMO using char [] is old fashioned and that's why I prefer strings. Why to learn first the old way of doing stuff and then move to modern? There's no point.

char [] also is more like C syntax than C++ syntax, I think. strcmp is also a C command. It's from cstdlib, isn't it? And C stands for C :)

And btw.. You should be including cstdlib, not stdlib.h.

These are my thoughts, you don't have to agree them. There's no need to tell me, if you don't agree.
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zart
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PostPosted: Wed Aug 22, 2007 8:22 am    Post subject: Reply with quote
Jani wrote:
Why to learn first the old way of doing stuff and then move to modern? There's no point.


Reinventing the wheel is fun Very Happy hahaha

Many ways to do it, I'd rather use strings like you did yourself... However if you where used to C style code - it could be faster to whip code using char[]


though that's ugly if your need to play nice with your memory allocations..
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lurc
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PostPosted: Wed Aug 22, 2007 8:49 am    Post subject: Reply with quote
isnt strcmp from the String library? ....
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TheSorc3r3r
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PostPosted: Wed Aug 22, 2007 3:28 pm    Post subject: Reply with quote
lurc, the string library is part of the C library.

idk, Jani, char arrays are the way I prefer; I never actually understood strings in memory until I used char arrays/pointers. Doesn't really matter though Razz
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zart
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PostPosted: Wed Aug 22, 2007 3:38 pm    Post subject: Reply with quote
TheSorc3r3r wrote:
lurc, the string library is part of the C library.

idk, Jani, char arrays are the way I prefer; I never actually understood strings in memory until I used char arrays/pointers. Doesn't really matter though Razz


the problem with using char arrays memory leaks/buffer overflows which you find when you start trying to secure code... it's "safer" to use strings

you only really notice the difference when initializing the two - the perform the same for the most part.

that being said - i often use char arrays for small applications because it's easy to manipulate (the way i was taught to program)

here is a nice thread that discusses the two;
http://www.thescripts.com/forum/thread432603.html


more specificly;
arrays are evil (good read)
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lurc
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PostPosted: Wed Aug 22, 2007 4:21 pm    Post subject: Reply with quote
TheSorc3r3r wrote:
lurc, the string library is part of the C library.


i know that.... the poster above said that it was part of the stdlib.h or cstdlib

THERE THE SAME THING
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Pseudo Xero
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PostPosted: Wed Aug 22, 2007 4:55 pm    Post subject: Reply with quote
Thanks for the help, everyone.
I didn't even understand the basic form of a C++ app. Shocked
I got it to compile with no trouble, hopefully I'll be able to find what I need through google now.
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haxory' wrote:
can't VB do anything??
windows is programmed using VB right? correct me if im wrong.

so all things in windows you have like the start menu is a windows form too.
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Robotex
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PostPosted: Wed Aug 22, 2007 11:50 pm    Post subject: Reply with quote
use arrays when you are sure the code won't exceed the limit or you need high speed performance (in this case you would "reinvent the wheel" yourself, adapting it to your needs)
it's all a matter of programming needs
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Jani
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PostPosted: Thu Aug 23, 2007 3:22 am    Post subject: Reply with quote
@TheSorc3r3r: C++ is an object oriented programming languange. "char" strings aren't objects unlike std::string's.. Try:
Code:
char test[] = "test";
std::cout << test.length();
and
Code:
std::string test("test");
std::cout << test.length();
:P

lurc wrote:
i know that.... the poster above said that it was part of the stdlib.h or cstdlib

THERE THE SAME THING
I do know that. I just told TheSorc3r3r to include cstdlib instead of stdlib.h, because cstdlib is the "c++ version" of it.

Robotex got the point anyway. It depends on the needs. I guess that the thread starter isn't in a competition where speed matters :P
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