String help

Hi, I'm fairly new at programming with C++. I'm trying to develop a program which generates GPS strings then sends them to another computer through the serial port. The problem I have is taking a number of variables (including ints, floats, strings) and put them together in a single long string like the following:

$GPRMC,012744,V,3840.2230,S,17801.9449,E,0.000,0.0 ,070602,20.9,E*43

Do I have to use stringstreams or something?
Any help would be greatly appreciated thanks.

sprintf() mebbe?

Quote:

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Originally posted by MadKiwi
Hi, I'm fairly new at programming with C++. I'm trying to develop a program which generates GPS strings then sends them to another computer through the serial port. The problem I have is taking a number of variables (including ints, floats, strings) and put them together in a single long string like the following:

$GPRMC,012744,V,3840.2230,S,17801.9449,E,0.000,0.0 ,070602,20.9,E*43

Do I have to use stringstreams or something?
Any help would be greatly appreciated thanks.

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You can use sprintf to format a string to take integers and the like. Try this.

Code:

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float number = 60.0f;
char buffer[256];

/* This will format your string */
sprintf( buffer, "The number is, %f", number );

cout << buffer << endl;

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You can use a stringstream or sprintf:

Code:

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#include <iostream>
#include <sstream>
#include <cstdio>

// Comment this line out to see stringstream.
#define WITH_SPRINTF

int main()
{
  int i = 10;
  float f = 123.4f;
  char c = 'G';
#ifdef WITH_SPRINTF
  char buffer[BUFSIZ];
  sprintf ( buffer, "%d,%.1f,%c", i, f, c );
  std::cout<< buffer <<std::endl;
#else
  std::ostringstream oss;
  oss<< i <<","<< f <<","<< c;
  std::cout<< oss.str() <<std::endl;
#endif
  return 0;
}

---

-Prelude

OMG those replies were quick. Thanks for the help. I can now get the stringstream to work.

Or the STL string class could work. Just use the + operator to conectate(sp?) the strings.

golfinguy4 ,

It's "concantenate". Oh, I just knew this was a pressing question with you! :)

Prelude,

(#include <stdio> for 'sprintf'. Borland. You'll know.) ;) (That silly "winky" thing again...) ;) (Darn it...)

-Skipper

>(#include <stdio> for 'sprintf'. Borland. You'll know.)
I know, memory lapse. But it should be #include <cstdio>. :)

-Prelude

Prelude,

I'll defer...but only because you're right. :)

#include <stdio> does work on Borland5, (tested, of course), but the standard is as you describe.

Right again. What are the odds? :D

-Skipper