Control in a vector

[nick048]

Hi to all,

I have this construnct:

......................
char mat [DIM], [DIM]
...................
cout << "Enter the new element" << endl;
for (i=0; i<DIM; i++)
for (j=0; j<DIM; j++)
cin >> mat[j];
...............................

How can to control, in this construct, that each element is >= 'A' and
<= 'Z'?

Thank You and Best Regards
Gaetano

 

[Rolf Magnus]

Hi to all,

I have this construnct:

.....................
char mat [DIM], [DIM]

Are you sure you're talking about C++. The above makes no sense.

..................
cout << "Enter the new element" << endl;
for (i=0; i<DIM; i++)
for (j=0; j<DIM; j++)
cin >> mat[j];
..............................

How can to control, in this construct, that each element is >= 'A' and
<= 'Z'?

if (mat[j] >= 'A' | mat[j] <= 'Z')
...

But I doubt that you actually want that check. I think you want to check
whether it's an uppercase letter. In this case, you better do:

if (isupper(mat[j]) && (isalpha(mat[j]))
...

 

[Rolf Magnus]

I think you want to check whether it's an uppercase letter. In this case,
you better do:

if (isupper(mat[j]) && (isalpha(mat[j]))
...

Ok, stupid me. If a character is an uppercase letter, then it's for sure a
letter, so the isalpha test can be removed:

if (isupper(mat[j]))
...

 

[=?ISO-8859-15?Q?Juli=E1n?= Albo]

How can to control, in this construct, that each element is >= 'A' and
<= 'Z'?

You must consider that in C++ there is no guarantee that the alphabetic
characters, both in upper and in lower case, are in ascending order and
without gaps. ASCII and extensions of ASCII characters sets has this
property (limited to the characters currently used in english), but C++ is
not limited to that family of character sets. See EBCDIC, for example.

 

[nick048]

Hi Rolf.

Are you sure you're talking about C++. The above makes no sense.<<

This is a part of my cpp file:
int main()
{
const int DIM=100;
char mat[DIM][DIM];
char car;
int i, j;
int cont;

/*Reading of the bidimensional matrix*/
cout << "Enter your char" << endl;
for (i=0; i<DIM; i++)
for (j=0; j<DIM; j++)
cin >> mat[j];
..
..
..
}
The file work correctly.

I need to insert in the "for construct" a control that check if my char
is "uppercase letter".
If the condition is true, the "for loop" continue with the next item;
otherwise it remains.


Best Regards
Gaetano