Conversions from string to int

[Larsson]

Hi!

I am an old C++ programmer and I have tried and treid again, but I can't understand how I convert a string or char to an integer.

int i;
string k = "123";
char j = "3";

i = j; //This gives hexa (I think) for 3: 51
i = (int) j; //Something.
i = (int) k; //Doesn't work.

Is there a function that does this, or do I have to write one myself?

Thanks for all help, Larsson.

 

[abybaby]

You can always use the inbuilt functions "atoi" and "atof".
Right at this moment I can not recall in which library you will find them, but indeed these functions are there.
I did use them long ago for a program.

 

[chiph]

Larsson -

Ignore AbyBaby's post - atoi and atof are old C-style conversion functions and they're not in .NET.

What you want is to use the static methods (no need to instantiate a copy first) of the Convert class. There's an overload of the ToInt32() method available for converting from a String:

   String MyStringValue = "46";

   int MyIntValue = Convert.ToInt32(MyStringValue);

You shouldn't need to set a reference to gain access to the Convert class, as it's part of the System namespace (which the project wizard includes in almost every new project).

Chip H.

 

[Alcar]

another solution is:

i = int.Parse(string)

Happy Coding!

 

[Larsson]

I would have figure out the Convert class myself, but thanks for all help anyway.

Larsson

 

[chiph]

Alcar -
I forgot about the Parse method - I'm always forgetting that the int datatype in C# is really a System.Int32 value type (ie. a struct) that has methods on it.

Thanks for the alternate method!

Chip H.

 

[Alcar]

You are mostly welcome Chip

 

[Guest_imported]

how would I do the following in C#:

C:

char *a = "123wow";
int i = atoi(a);

if (i == 123)
{
// This be good!
}

 

[chiph]

String a = "123wow";
int i = int.Parse(a);
if (i == 123) {
// This be good
}

Chip H.