question related to keypad

**lovemagix** · 01-04-2006

Code:

#include <iostream>
#include <sstream>  //ostringstream, str()
using namespace std;


int main() {
   
	ostringstream out;

	int n = 2;
	out<<n;

	n = 5;
	out<<n;

	n = 7;
	out<<n;

	string str = out.str();

	cout<<str<<endl;

	return 0;
}

to all the users, please help me... instead of using stringstream, is there another other methods?
my complier do not allow the using of namespace std

**Syneris** · 01-04-2006

if you can't use using namespace std then can you use std:: in the appropriate places?

**lovemagix** · 01-04-2006

sorry... i cant use std:: in my complier too... is there another other methods to input in data beside using of stringstream?

**ChaosEngine** · 01-04-2006

I think a stringstream is probably overkill here. It's sounds like some sort of embedded platform so a stream might use too much memory/processor.

just do something simple like

Code:

int value = 0;
int keypadVal = GetKeyPadValue(); // get number from keypad
do
{
    // decimal shift!
    value += (10 * value) + keypadVal;
    keypadVal = GetKeyPadValue(); // get number from keypad
}
while (keypadVal != NO_MORE_KEYS); // or some other signal

that's straight off the top of my head, so prob contains both syntax and logic errors but you get the idea

**lovemagix** · 01-04-2006

thanks alot...

i am a newbie to programming...

can someone please give me some pointers on how to convert char to int... i cannot find anything on the search engines... thanks.

**ChaosEngine** · 01-04-2006

Originally Posted by lovemagix

thanks alot...

i am a newbie to programming...

can someone please give me some pointers on how to convert char to int... i cannot find anything on the search engines... thanks.

you can't be looking very hard... that must be one of the most commonly asked C/C++ questions!

but to give you a headstart

in C:
atoi
sscanf

in C++:
std::stringstream
or even cooler
boost::lexical_cast

I still don't think you need to convert to char in the first place though

**lovemagix** · 01-05-2006

sorry.... i looking hard because... all the source codes that deal with hexa conversion uses stringstream... for my complier, i cannot use stringstream... is there another other ways.. please