Program stops mid-way.

[nbonzani]

I'm doing an assignment for a C++ class, and I can't seem to figure out why my program keeps hiccoughing in the middle of running. The program runs fine when I run only the strlen_recursive function, but when i run the strcpy_recursive function, it stops and gives me an error. Any help would be greatly appreciated!

#include <string>
#include <iostream>
using namespace std;

int strlen_recursive(char* in);
char* strcpy_recursive(char*in, char* copy);
int main()
{
	int length(0);
	char string[50];
	char copy[500];
	cin>>string;
	length=strlen_recursive(string);
	cout<< length<< endl;
	strcpy_recursive(string, copy);
	cout<< copy;
	return 0;
}

int strlen_recursive(char* s)
{
	
	if(*s=='\0')
		return 0;
	else
		return (1+strlen_recursive(s+1));
}

char* strcpy_recursive(char* in, char* copy)
{
	if((*in=*copy) != '\0')
		strcpy_recursive(in+1,copy+1);
	return in;
}

[Dy7SLyTq]

try *in = *copy without the != '\0'

[nbonzani]

That still doesn't work. I'm not sure what the problem is.

[Dy7SLyTq]

oh wait i think i know the problem. so i believe that when u have an empty array of chars (in this case copy), copy[0] is \0 so its already at the end. and string currently points to the end because of strlen_recursive. so the first time they are called in and copy both equal '\0'

[nbonzani]

How do I fix that?

[nbonzani]

Can anyone help with this?

[Dy7SLyTq]

sorry i cant think of a solution

[LB]

Look at the order and use of your parameters. You pass (string, copy) when you call it, and the function copies copy into in.