Pointers Fuctions

[sleepyfool]

I am currently doing a practice problem for an upcoming exam,but I'm am unsure of what to do when the instruction says to "Return the pointer to the first appearance of c appearing inside s". So if anyone could point me in the right direction I would be very grateful.


#include <iostream>
#include <string>

using namespace std;

char my_strchr(const char * s, char c)
{

if (c != *s)
{
return 0;
}

}

int main()
{
char cstr[50] = "Abadabadoo!";
cout << my_strchr(cstr, 'a') << endl;
}

[Lv0f92yv]

You are given a char array, and can iterate over it by the following:

for ( int i = 0; i < strlen( s ); i++ )
{
   cout << s[i]; //is the char at offset 'i'
}

, from here, you can determine the position of 'c' at 's'. Hope this helps.

Edit: Your return value is a pointer to this position in this array. If you're not sure how to return a pointer to that, check out pointer arithmetic: http://www.cplusplus.com/doc/tutorial/pointers/

[sleepyfool]

Thanks Desh! Though, is there a way to do it without strlen()?

[Lv0f92yv]

Maybe you could try this:

for ( int i = 0; s[i] != '\0'; i++ )
{
   cout << let[i];
}

note the loop condition: as long as the char at offset 'i' isn't the null terminator character, keep incrementing the offset.

Why don't you want to use strlen?

[sleepyfool]

Once again THANK YOU :D.I had forgotten to mention that the instruction forbids the use of C++ string class or C-style string functions in the standard library, including strlen() for the following function. Sorry about that that.

[Lv0f92yv]

Ahh I see. Figured it was something like that. No worries.