clear contents in char**

Question

For the life of me I can't figure out how to do this. I thought I could use memset() but I'm getting a segmentation fault.

char **a;
token = strtok( NULL, " " );
if( token != NULL )
    strcpy( token, strtok( token, "\n" )); // get rid of '\n' at end if it exists
else{  
    // I want to reset all the values in a to null 
    return;
}

I thought I could even just do a while loop like while(a[i] != 0 ) set each element to 0, but even then I'm getting a segmentation fault. This should be easy right? What am I doing wrong?

`a` doesn't have any memory allocated. Is this the correct code sample? — simonc, Feb 08 '13 at 16:22
There are no "values in `a`"; all you have is a pointer to nowhere. — hobbs, Feb 08 '13 at 16:23
Possible duplicate of http://stackoverflow.com/questions/632846/clearing-a-char-array-c — bdesham, Feb 08 '13 at 16:23
How it could be allocated else where and it's defined here ?! Please provide the complete code this will avoid you to get many questions and remarks — MOHAMED, Feb 08 '13 at 16:28
Sorry, I'm new here. Yes of course my code confused everyone. I apologize. I'm still in my infancy here. — Matthew The Terrible, Feb 08 '13 at 16:31

score 2 · Accepted Answer · answered Feb 08 '13 at 16:22

2

Your initial call to strtok() should NOT be done with a NULL argument as the first parameter!

Check the reference:

http://www.cplusplus.com/reference/cstring/strtok/

What exactly are you trying to achieve?

answered Feb 08 '13 at 16:22

Forhad Ahmed

1,761
13
18

sorry I posted just the segement of code that wasn't working. – Matthew The Terrible Feb 08 '13 at 16:24

clear contents in char**

1 Answers1