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HELP!! how do you use atoi?
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Join Date: Aug 2008
Posts: 91
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Junior Poster in Training
I'm trying to figure out how to use the atoi function I have wrote and understand this so far:
#include<iostream>
#include<cstdlib>
#include<cstring>
using namespace std;
int main()
{
int x;
string str="34";
x=atoi(str);
cout<<x;
system("pause");
return 0;
}
And Then I get error reports about a freakin const char?! HELP!
#include<iostream>
#include<cstdlib>
#include<cstring>
using namespace std;
int main()
{
int x;
string str="34";
x=atoi(str);
cout<<x;
system("pause");
return 0;
}
And Then I get error reports about a freakin const char?! HELP!
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Join Date: Jan 2008
Posts: 401
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Solved Threads: 40
Posting Pro in Training
Always post the exact errors you get for the best help.
atio() takes input of type
do this:
Or, better yet, use stringstreams:
atio() takes input of type
const char* .do this:
x=atoi(str.c_str());Or, better yet, use stringstreams:
C++ Syntax (Toggle Plain Text)
Last edited by CoolGamer48; Aug 4th, 2008 at 2:58 pm.
I'm a student. If my statements seem too absolute, feel free to coat them with "In my opinion..." or "I believe...".
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Join Date: Aug 2008
Posts: 91
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Junior Poster in Training
Thank you so much-it works now but I still don't get why you need the .c_str()-does it make it refer to str as a constant string?
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Join Date: Jan 2008
Posts: 401
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Posting Pro in Training
the string::c_str() method converts the contents of an std::string to const char*. For example:
further information here
You'd be better off using string streams though. there isn't a need to convert an std::string into an old C-string (const char*). string streams can handle std::strings and C-strings.
C++ Syntax (Toggle Plain Text)
further information here
You'd be better off using string streams though. there isn't a need to convert an std::string into an old C-string (const char*). string streams can handle std::strings and C-strings.
I'm a student. If my statements seem too absolute, feel free to coat them with "In my opinion..." or "I believe...".
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