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Topic: Converting a char into an int (Read 487 times) previous topic - next topic

missmoun

Hello,

I'm trying to convert the content of a char array (made of numbers) into an int (or at least an array of integers); something like passing data from char serialNum[n] to int calculateNum[n].

The atoi() function from the stdlib library seems like it could do the trick but i havn't been able to use it properly so far.

Thanks,


wandrson

What do you mean by a character array?

Do you mean

char serialNum[] = { '1', '2', '3', '4', '5' }

or

char serialNum[] = "123456";

If you mean something like the first, then that would be the source of the problem with the atoi function.  This function expects to receive a 'c' language string which has a '\0' as the last character of the array.  If you were to look at the memory map for the second version you would see this terminating null.

value = atoi(serialNum)  should work for the second definition of serialNum.

If the first definition was modified to:

char serialNum[] = { '1', '2', '3', '4', '5', '\0' }

It would work also.

missmoun

This is great.
I meant  char serialNum[] = { '1', '2', '3', '4', '5' }.
Putting '\0' manually at the end of the array did it, i just added
serialNum[5] = '\0'
and the atoi function now runs properly.
Thank you very much!

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