how to convert a string to an int?

well title says all. i have a string with numbers on it and want to convert it to an int so i can do calculations with the numbers.

 

well I am not a c++ expert by no means, but I heard it is similar to java and in java you do

Code:

int "name your int" = Integer.parseInt("string"[1]);

 

I'm pretty sure it only works with arrays of characters and not "Strings" but it'll do what you want with some changes in your program.

http://www.cplusplus.com/reference/clibrary/cstdlib/atoi.html

 

char *buf = "123";
int n = atoi(buf);

 

im using the atoi function for this, but i have 1 problem. the compiler gives me an error that says:
error C2664: 'atoi' : cannot convert parameter 1 from 'char' to 'const char *'
Conversion from integral type to pointer type requires reinterpret_cast, C-style cast or function-style cast
and i tryed casting the var like this: atoi((const char *) var);
that way the program compiles, but gets stuck, so that cast might have changed the var's data.

 

You're declaring it as a char when it should be char*.

 

Ya well you are right. I solved it in another way:

Code:

#include <string>
#include <iostream>

using namespace std;

int main()
{
string a = "";
cout << "Enter string to convert: ";
cin >> a;
int b = atoi(a.c_str());
cout << a << " was converted into int: " << b << endl;
system("PAUSE");
} 

now it works xD
thank you all!