Parse integers from string?

[Coach_Nate]

I was wondering if there is any way to parse integers from a string (like in java)? Anyone know of a built in function in c++?

[Rashakil Fol]

stringstream

[dwks]

http://faq.cprogramming.com/cgi-bin/smartfaq.cgi?answer=1046996179&id=1043284385

[kawk]

atoi is a C function that works in C++.

e.g.:

#include <iostream>
#include <cstdio>
#include <cstring>

int main() {
    char s[80];
    int i;
    cin>>s;
    i = atoi(s);
    cout>>i;
    return 0;
}

My C++ is a little rusty, but that's my example. Using the String class might be a little dirrerent.

[dwks]

You mean string (lowercase 's').

atoi() is a non-standard function; if you have it, it would be in <cstdlib>.

If you insist on using C functions, see this link: http://faq.cprogramming.com/cgi-bin/smartfaq.cgi?answer=1043372399&id=1043284385

[dwks]

Rusty, indeed. :)

cout>>i;

->

cout<<i;

[Rashakil Fol]

atoi() is a non-standard function;

atoi is part of the C89 standard.

[iamthwee]

I wouldn't use atoi in c++, assuming of course _jsw's sources are correct ;)

http://www.daniweb.com/techtalkforums/thread39691.html

[gobartatti]

hey fucktards, I wanted to know if I could parse a single integer from a string that contains multiple substrings** and integers -.-

[Gonbe]

hey ####tards, I wanted to know if I could parse a single integer from a string that contains multiple substrings** and integers -.-

Hey clown. Glad to hear you no longer want to know.

[Lucaci Andrew]

gobartatti - As we all can see, you are new to our community. One way of getting you noticed in a good way, and also, to be helped, is to obey the rules (which you agreed upon your registration) and not to embarrass yourself by your posts.

I see you have a question, but this thread in which you posted is 6 years old (threads older than 3 months shouldn't be replied, only if adding important/new information to the topic). I sugest you to start a new topic in wich to exaplain your needs/problems, also proving (by showing some code) that you'd tried to solve that issues.
Good luck.

[rubberman]

Instead of atoi, use strtol() (string to long) or strtoll() (string to long long). They let you provide a pointer that will be set to the first unconvertable character. It will deal with +- leaders, and all the rest of that cruft. Perfectly fine in C++. If you are reading from a stream in C++, then you are probably better off using the syntax strm >> intvar such as cin >> anInt.