How can I convert char* to int?

Question

I have the array of the arrays of char. I need to convert it into an array of int. How can I do that? I know we can convert char* to int as follows:

char *i = "123";
std::stringstream ss;
ss << i;
int ii;
ss >> ii;
std::cout << ii << std::endl; //prints 123

But how can I convert the array of such an arrays into an array of integers?

You mean something like [`std::stoi`](http://en.cppreference.com/w/cpp/string/basic_string/stol)? — Some programmer dude, Jun 15 '15 at 16:57
@JoachimPileborg So, using the stringstream is a legacy way of doing that? — St.Antario, Jun 15 '15 at 17:01

Sourav Kanta · Answer 1 · 2015-06-15T16:58:33.843

2

You can try the atoi() function already present.

It will convert the string into a integer that you can use.

edited Jun 15 '15 at 16:58

answered Jun 15 '15 at 16:57

Sourav Kanta

2,727
1
18
29

I've heard that we should try to avoid using that function... – St.Antario Jun 15 '15 at 16:58
You can take a look at [this](http://stackoverflow.com/questions/3850558/how-to-check-to-ensure-you-have-an-integer-before-calling-atoi) – Sourav Kanta Jun 15 '15 at 17:01

score 1 · Answer 2 · answered Jun 15 '15 at 17:02

1

char* strings[4] = { "123", "456", "789", "555" };
int vals[4];
for (int i = 0; i < 4; ++i)
{
    std::stringstream ss;
    ss << strings[i];
    ss >> vals[i];
}
for (int i = 0; i < 4; ++i)
{
    std::cout << vals[i] << std::endl;
}

answered Jun 15 '15 at 17:02

tsandy

911
4
10

How can I convert char* to int?

2 Answers2