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Alek Richter
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Enlightened
Asked: 2021-12-14T05:48:52+00:00 In:

Easiest way to convert int to string in C++

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What is the easiest way to convert from int to equivalent string in C++. I am aware of two methods. Is there any easier way?

(1)

int a = 10;
char *intStr = itoa(a);
string str = string(intStr);

(2)

int a = 10;
stringstream ss;
ss << a;
string str = ss.str();

1 Answer

  2. Enlightened

    C++11 introduces std::stoi (and variants for each numeric type) and std::to_string, the counterparts of the C atoi and itoa but expressed in term of std::string.

    #include <string> 

std::string s = std::to_string(42);

    is therefore the shortest way I can think of. You can even omit naming the type, using the auto keyword:

    auto s = std::to_string(42);

    Note: see [string.conversions] (21.5 in n3242)

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