question regard 2d array

[dorias]

hi,

How can if find what is the number of the rows in a 2 dimention array?

Thank you,
Daniel

[Moschops]

By looking at the code where it is created and reading the numbers.

[dorias]

so if for example I do:

const char forbiddenStrings[][SIZE] = {"flower", "blo", "plant", ""};

so how can I calculat the rows number of it? (not manually)

strlen doesnt works here....

[vlad from moscow]

All elements of the array (that is rows) have the same size that is SIZE.

The number of rows is calculated the following way

size_t Rows = sizeof( forbiddenStrings ) / sizeof( *forbiddenStrings );

In your case the formula is equivalent to

size_t Rows = sizeof( forbiddenStrings ) / SIZE;


Another way is to write two template functions

template <typename T, size_t N, size_t M>
inline size_t Rows( T ( &a )[N][M] )
{
   return ( N );
}

template <typename T, size_t N, size_t M>
inline size_t Cols( T ( &a )[N][M] )
{
   return ( M );
}

And in your code use

size_t n = Rows( forbiddenStrings );
size_t m = Cols( forbiddenStrings );

[dorias]

Thank you very much!!!!

you helped me a lot.