how do i find if the first character of a pointer to a string doesnt equal a character:
I'm getttingCode:void purge(char* check) { if(check[0] != "#") { check = strcat("#",check); } }
Cannot convert 'char' to 'char *' in function purge(char *)
how do i find if the first character of a pointer to a string doesnt equal a character:
I'm getttingCode:void purge(char* check) { if(check[0] != "#") { check = strcat("#",check); } }
Cannot convert 'char' to 'char *' in function purge(char *)
'#'
But you have other problems I'll let other elaberate on.....(gotta go)
gg
you just need to change "#" to '#' and you should be good to go
[edit] Dang you codeplug[/edit]
Woop?
1)should beCode:if(check[0] != "#")2)Code:if(check[0] != '#')What are you trying to do here? "#" points to a read only area in memory so trying to append check onto it will likely cause a seg fault.Code:strcat("#",check);
Ok thats gone now this is what i have
I'm just trying to add and # at the begining if there isnt one.Code:if(check[0] != '#') { strcat('#',check); }
im getting this
Error E2285 .\main.cpp 116: Could not find a match for 'strcat(char,char *)' in function purge(char *)
>strcat('#',check);
That still won't work.
>I'm just trying to add and # at the begining if there isnt one.
Using C-style strings you prety much have no choice but to use a temporary and do things manually:
Using your function declaration, it doesn't really get better. The above function is dangerous and bug riddled, and you should avoid it if possible. If you can switch to C++ strings, things become much easier:Code:void purge( char *check ) { if (*check != '#') { char *save = new char[strlen(check) + 2]; strcpy(save, "#"); strcat(save, check); strcpy(check, save); delete [] save; } }
Or you'll just have to add parameters to the function so that the C solution can be made more safe:Code:void purge( string& check ) { if (check[0] != '#') { check = '#' + check; } }
And so on...Code:void purge( char *check, size_t size ) { if (*check != '#') { if (strlen(check) + 1 >= size) { throw "Error"; } char *save = new char[strlen(check) + 2]; strcpy(save, "#"); strcat(save, check); strcpy(check, save); delete [] save; } }
My best code is written with the delete key.
you lost me with that whole c++ string thing when did that come about that looks a hell of a lot easier, i havent been programming in like a year or so i think i am really out of date
>when did that come about that looks a hell of a lot easier
It is easier, and it's been an official part of the language since 1998 (though present for some time before that), not to mention the slew of string classes written by just about every C++ programmer since C with Classes.
My best code is written with the delete key.
to change a string to lower case, go through the string one char at a time and use function: newString[i] = tolower(myString[i]);
to check if first is a letter you could use this function:
isalpha(myString[0])
both these functions are in <cctype>
given i havnt bothered to deal with the pointer stuff...
Last edited by ryan_germain; 06-21-2004 at 11:59 AM.
