ascii numbers

[Dan]

Some knows how to verify an ascii code.
I want to verify a char for the list of ascii codes between 64 to 122.
Mainly in other words, check a char, look if its in a range of ascii code
and output a bool, true or false.
thanks

D

[Pete C.]

Dan wrote:

Some knows how to verify an ascii code.
I want to verify a char for the list of ascii codes between 64 to 122.
Mainly in other words, check a char, look if its in a range of ascii
code and output a bool, true or false.
thanks

D

template<class T>
bool isbetween(T c, T l, T u)
{
if(l > u) std::swap(l, u);
return c >= l && c <= u;
}

int main()
{
bool c_between_64_12 2 = isbetween('c', 64, 122);
}

As a bonus, it works for any type where operators >, >=, and <= are defined.

- Pete

[Dan]

template<class T>
bool isbetween(T c, T l, T u)
{
if(l > u) std::swap(l, u);
return c >= l && c <= u;
}

int main()
{
bool c_between_64_12 2 = isbetween('c', 64, 122);
}

As a bonus, it works for any type where operators >, >=, and <= are defined.
- Pete

Thats pretty cool stuff.
I can see that return c >= l && c <= u will return a bool value for values
between 64 and 122 only if the conditions above are met. What I want to know
is your 'c' , I guess this is you input ? do you declare it as a char
array? so as to make it

int main()
{
char c;

cout<<"Press a key " ;
cin>> c;

bool c_between_64_12 2 = isbetween('c', 64, 122);
if (bool == true) { cout<< "It is in there" <<endl; }
if (bool == false) {cout<< "It is not in there" <<endl; }

[Pete C.]

Dan wrote:

template<class T>
bool isbetween(T c, T l, T u)
{
if(l > u) std::swap(l, u);
return c >= l && c <= u;
}

<snip>
Thats pretty cool stuff.
I can see that return c >= l && c <= u will return a bool value for
values between 64 and 122 only if the conditions above are met. What
I want to know is your 'c' , I guess this is you input ? do you
declare it as a char array? so as to make it

int main()
{
char c;

cout<<"Press a key " ;
cin>> c;

bool c_between_64_12 2 = isbetween('c', 64, 122);
if (bool == true) { cout<< "It is in there" <<endl; }
if (bool == false) {cout<< "It is not in there" <<endl; }

'c' is a character constant I randomly picked to demo it, to make your
example work correctly:

#include <iostream>
using std::cout;
using std::endl;

#include <algorithm>

template<class T>
bool isbetween(T c, T l, T u)
{
if(l > u) std::swap(l, u);
return c >= l && c <= u;
}

int main()
{
char c;
cout << "Enter a character: " ;
cin >> c;
cout << endl;

bool c_between_64_12 2 = isbetween(c, 64, 122);
if (c_between_64_1 22)
cout << "It is in there" << endl;
else
cout << "It is not in there" << endl;

return 0;
}

- Pete

[Gernot Frisch]

> template<class T>

bool isbetween(T c, T l, T u)
{
if(l > u) std::swap(l, u);
return c >= l && c <= u;
}
bool c_between_64_12 2 = isbetween('c', 64, 122);

Now, I didn't get this... Where do you define T for the clas template?
Or do all have to be of the same type? I would have expected something
like:
isbetween<char> ('c', 64, 122)
No?
You're puzzling me here... And I thought I understood templates...
-Gernot

[Rob Williscroft]

Gernot Frisch wrote in news:2j******** ****@uni-berlin.de in
comp.lang.c++:

template<class T>
bool isbetween(T c, T l, T u)
{
if(l > u) std::swap(l, u);
return c >= l && c <= u;
}
bool c_between_64_12 2 = isbetween('c', 64, 122);
Now, I didn't get this... Where do you define T for the clas template?

T is deduced.
Or do all have to be of the same type?
Yes they do.
I would have expected something
like:
isbetween<char> ('c', 64, 122)
No? You're puzzling me here... And I thought I understood templates...

The bit you have missed is that 'c' is passed as an int, so template
argument deduction succeds with T = int. The call is effectivly:

isbetween( int >( 'c', 64, 122 );

Rob.
--
http://www.victim-prime.dsl.pipex.com/

[Rob Williscroft]

Rob Williscroft wrote in news:Xns950864E DDF118ukcoREMOV Efreenetrtw@
130.133.1.4 in comp.lang.c++:

isbetween( int >( 'c', 64, 122 );

isbetween< int >( 'c', 64, 122 );

Rob.
--
http://www.victim-prime.dsl.pipex.com/

[John Harrison]

"Gernot Frisch" <[e-mail] > wrote in message
news:2j******** ****@uni-berlin.de...

template<class T>
bool isbetween(T c, T l, T u)
{
if(l > u) std::swap(l, u);
return c >= l && c <= u;
}
bool c_between_64_12 2 = isbetween('c', 64, 122);

Now, I didn't get this... Where do you define T for the clas template?
Or do all have to be of the same type? I would have expected something
like:
isbetween<char> ('c', 64, 122)
No?
You're puzzling me here... And I thought I understood templates...
-Gernot

Yes that should be

bool c_between_64_12 2 = isbetween('c', (char)64, (char)122);

or as you had it

bool c_between_64_12 2 = isbetween<char> ('c', 64, 122);

or alternatively

template<class T, class U>
bool isbetween(T c, U l, U u)
{
if(l > u) std::swap(l, u);
return c >= l && c <= u;
}

john

[John Harrison]

I stand corrected.

john

[Dan]

"Gernot Frisch" <[e-mail] > wrote in message
news:2j******** ****@uni-berlin.de...

template<class T>
bool isbetween(T c, T l, T u)
{
if(l > u) std::swap(l, u);
return c >= l && c <= u;
}
bool c_between_64_12 2 = isbetween('c', 64, 122);

Now, I didn't get this... Where do you define T for the clas template?
Or do all have to be of the same type? I would have expected something
like:
isbetween<char> ('c', 64, 122)
No?
You're puzzling me here... And I thought I understood templates...
-Gernot

after compiling
error C2782: 'bool __cdecl isbetween(T,T,T )' : template parameter 'T' is
ambiguous
D