Re: Converting a substring to Integer
On Feb 6, 9:27 am, Reetesh Mukul <reetesh.mu...@gmail.com> wrote:
On Feb 6, 6:35 am, "Daniel T." <danie...@earthlink.net> wrote:
Reetesh Mukul <reetesh.mu...@gmail.com> wrote:
You can try this:-
#include <iostream>
#include <sstream>
#include <cctype>
int main()
{
std::string s = "dsdhjsahdk dsdjdsaj 36782367 sdjdhak";
int j = 0;
std::stringstream cstr;
cstr << s;
int i = 0;
char ch;
while( cstr >> ch )
{
if( std::isdigit(ch) )
{
cstr.putback(ch);
break;
}
From here:
if( ( j = s.find(" ",j) )== std::string::npos )
{
cstr.seekg(-1);
break;
}
cstr.seekg(++j, std::ios::beg);
to here. Is this block of code necessary?
}
if(cstr)
{
cstr >> i;
}
std::cout << i;
return 0;
}
Wouldn't this be a simpler way of doing the same thing?
int main()
{
std::string s = "dsdhjsahdk dsdjdsaj 36782367 sdjdhak";
int i = 0;
std::stringstream cstr( s );
char ch = 0;
while( cstr >> ch && !isdigit( ch ) )
{ }
cstr.putback( ch );
cstr >> i;
cout << i;
}
Actually, I assumed that numeric-digits will appear surrounded by
space. This means some thing like {alphabet}*space {digits}+
space({alphabet}*space)*. Your code will extract digits in the
following conditions also:- djshdjshj14524 jdhdss
Regards,
Reetesh Mukul
The original code I posted is 'compilable' code in Borland Delphi
Studio. My assumptions were that the number would be surrounded by
spaces, and actually that the number would be after the first space.
AnsiString:
The AnsiString data type is used to hold sequences of characters.
Each character is an AnsiChar, guaranteed to be 8 bits in size.
An AnsiString can hold any number of characters, restricted only by
memory.
Unlike ShortStrings, AnsiStrings are pointer referenced variables.
Storage is allocated for an AnsiString only when needed. For example,
assigning the value of one AnsiString to another does not allocate
storage for a copy of the first string. Instead, the reference count
of the first string is incremented, and the second AnsiString set to
point to it.
I thought I knew C++ a little, but I realized that I don't because I
can barely follow what you guys posted. I tried to put some of the
code into Borland C++ Builder, but seems like Borland does not follow
the standards very well. Thanks for all your help. This will give me
really good base to work on and see if I can get it to work.