Newbie Question
Hello All
Ive finally made the jump to C++ and im struggling
with the basics
Ive done loads of class stuff with PHP and the
crossover to C++ is going well, but im falling
down on the other stuff
Ive read loads of documentation about passing
chars around, declaring pointers etc, but i need
some sound advice on the best way to declare
pass and return chars from functions, ive read so
many conflicting views about this, anyone know
the best method
Marky_Mark
Last edited by Marky_Mark; 10-16-2001 at 04:00 PM.
Depends on if you are talking about static memory or dynamic memory. It is important to be aware of the scope of the variables and whether the variable exists on a function stack or else on a global free store.
I would like to know how i could pass a function
a string or a reference to a string have that
function modify it and return it
C++ is so much more memory based than what ive
been used to, i am finding declaring and using
char pointers difficult, if i want to pass a
string to a function and return it, do i use a
pointer or a reference
Marky_Mark
Last edited by Marky_Mark; 10-16-2001 at 01:44 PM.
In this case the values are updated in main. The value array decays into a pointer to the first element. As in &array[0]Code:#include<stdio.h> void Function(int [],int); int main() { int array[3]; for(int i=0; i < 3; i++) { array[i] = i; printf("Before: %d\n",array[i]); } Function(array,i); for(i=0; i < 3; i++) { printf("After: %d\n",array[i]); } return 0; } void Function(int a[],int size) { for(int i=0; i<size;i++) { a[i] +=10; } }
Last edited by Troll_King; 10-16-2001 at 02:08 PM.
Troll_King im impressed, but i need an example
using strings
If i pass a string do i have to use an array to
access each character, or can i use one var
or pointer to access and alter that string
I need to pass a string as a whole object or
reference to that object add a char to the end
of the string and return it
Marky_Mark
Just make sure these is a '\o' at the end of your strings. Sometimes you have to add it. For example:Code:#include<stdio.h> #include<string.h> void Function(char []); int main() { char array[30] = { "Hello Worl"}; printf("Before: %s\n",array); Function(array); printf("After: %s\n",array); return 0; } void Function(char a[]) { char *ptr = a; ptr += strlen(a); *ptr = 'd'; }
*ptr = '\0';
Thanks Troll_King you are a *star
Marky_Mark
