a question on type conversion in C++

ReverseLogic · 11-26-2001, 07:23 PM

yes, I am quite the newbie. My problem is, I'm trying to convert a CString Class (yes, this is in windows, I'm sorry but this is the only forum that i could think of) into a type int. thanks in advance.
-RL

ReverseLogic · 11-26-2001, 09:51 PM

the conversion I want done. if the value of a CString is "2583", I want that converted to the interger 2583. thanks again.

-RL

tyler_durden · 11-27-2001, 08:59 PM

write a fucntion to do it yourself. first, get the string length.
then take the first char ie 2 convert that to a numer ie try printing out the char with the %d command and see what the offset is (the difference between ascii and the binary value, i think its 35). then subtract 35 from that char value. then multiply this time ten to the length power. get the next one do the same, but mult by ten to the length minus 1 power. add this to the first one and keep going

crabboy · 11-27-2001, 11:06 PM

Character string to an integer use: atoi

Code:

char dude[] = "50";
dude = atoi( dude );

You will have to figure out how to get a CString into a character array. The STL uses a .c_str() member funciton.

Int to a string use: sprintf

Code:

char dude[50];
int num = 50;
sprintf( dude, "%d", num );

This is quick and dirty C code. Many may say that sprintf nor atoi is safe to use. Here is a C++ replacement for using sprintf.

Code:

#include <strstream>
#include <iostream>

main()
{
   std::strstream dude;
   int i = 50;
   dude << i << ends;
   cout << dude.str() << endl;
}