Character Pointers

nikhil.stephen · 02-25-2011, 01:38 AM

hi,

I need to creates string suffixes out of a Reference string.
for eg. suffixes of abcdefg will be

1)bcdefg
2)cdefg
3)defg
and so on...

my idea was to create an array of pointers to point to the first few characters and then use that pointer to print the rest of the string.
But when i print using the pointer i get GARBAGE values!!!!

shudn't std::cout<<ptr[w] print the string following the char it is pointing to? why do i get garbage values??

Aquarius_Girl · 02-25-2011, 02:00 AM

Quote:

Originally Posted by nikhil.stephen

shudn't std::cout<<ptr[w] print the string following the char it is pointing to?

Could you explain this with some code? What is 'ptr'? How have you stored the string "abcdef"?

yy.cpp

Code:

#include <iostream>
using namespace std;

int main ()
{
     char* dd = (char*)"abcdef";
     
     cout << *dd << "\n";
     cout << dd << "\n";
     
     cout << *(dd+1) << "\n";
     cout << dd+1 << "\n";

     return 0;
}

Output:

Code:

anisha@linux-uitj:~> g++ -Wall -Wextra yy.cpp
anisha@linux-uitj:~> ./a.out
a
abcdef
b
bcdef

nikhil.stephen · 02-28-2011, 02:33 AM

// creating 5 Suffixes
int k=1;
char *ptr[5]; //i need array of pointers
while(k<6)
{
ptr[k]=refcpy+k; //refcpy is where my original string is stored
k++;
}

//printing suffixes
for(int w=1;w<=5;w++)

{
std::cout<<ptr[w]; // this step prints suffixes but with garbage values!!!
std::cout<<"\n";

}

dugan · 02-28-2011, 03:09 AM

Code:

#include <iostream>
#include <cstring>

using namespace std;

int main()
{
	const char *ptr = "abcdefg";

	for (int i = 0; i < strlen(ptr); i++)
	{
		cout << &ptr[i] << endl;
	}

	return 0;
}