Validating a string...
Hello-
Here is my problem. I'm trying to parse a string that is entered by a user to make it conform to certain rules.
For example I needed to do this with a phone number so the function would strip out all of the non-numeric characters. White space and "-", "(", and so-on.
My function that accomplishes this is
void TForm1::StripPhoneNumber(c
{
while(*src)
{
if(isdigit(*src))
{
*(dest++) = *src;
}
src++;
}
*dest = 0;
}
It works well, but now i'm trying to do something similar but that keeps all letters and digits. For instance,
1-800-ABC-DEFG would still return 1800ABCDEFG, and not just 1800.
All I really need is an isletter equivalent to isdigit to put in the if statement. Does such a function exist?
Thanks!
Here is my problem. I'm trying to parse a string that is entered by a user to make it conform to certain rules.
For example I needed to do this with a phone number so the function would strip out all of the non-numeric characters. White space and "-", "(", and so-on.
My function that accomplishes this is
void TForm1::StripPhoneNumber(c
{
while(*src)
{
if(isdigit(*src))
{
*(dest++) = *src;
}
src++;
}
*dest = 0;
}
It works well, but now i'm trying to do something similar but that keeps all letters and digits. For instance,
1-800-ABC-DEFG would still return 1800ABCDEFG, and not just 1800.
All I really need is an isletter equivalent to isdigit to put in the if statement. Does such a function exist?
Thanks!
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int isalnum( int c );
int iswalnum( wint_t c );
Each of these routines returns true if c is a particular representation of an alphanumeric character.
Return Value
isalnum returns a non-zero value if either isalpha or isdigit is true for c, that is, if c is within the ranges A – Z, a – z, or 0 – 9. iswalnum returns a non-zero value if either iswalpha or iswdigit is true for c. Each of these routines returns 0 if c does not satisfy the test condition.