C++ string to int. Mil lehet a probléma? (többi a leírásban)

#include <iostream>

#include <string>

using namespace std;

int main()

{

string a="23";

int b;

b=stoi(a);

cout << b << endl;

return 0;

}

||=== Build: Debug in string to int (compiler: GNU GCC Compiler) ===|

D:\Code\string to int\main.cpp||In function 'int main()':|

D:\Code\string to int\main.cpp|10|error: 'stoi' was not declared in this scope|

||=== Build failed: 1 error(s), 0 warning(s) (0 minute(s), 0 second(s)) ===|

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