weird problem with new

[ayan4u]

actually i am trying to dynamically allocate spaces for an charecter array that is to be copied from a c++ string...

suppose..

 
string sum_string ="";
getline(cin,sum_string);
 
char *array =new char[sum_string.length()+1];
 
sum_string.copy(array, sum_string.length()];
 
cout<<sum_string.length()<<endl;
 
cout<<strlen(array)<<endl;
 
....
 
delele [] array;
array =NULL;
 
 

suppose my string is "mynameis" now its length is 8 so that 8+1 spaces will be allocated for array..

ok fine sum_string.length() shows 8
BUT
strlen(array) is showing 12 ???

but that nothing strange yet...

for strings with greater length particularly those containing spaces both the output is same surprisingly......

again if i manually allocate 40 spaces i.e., char *array =new char[40];

then its doing fine with "mynameis"....



please help ASAP....

[Ganon11]

There might be trouble because you are not ending your character array with a '\0'. After you copy the string over, you should manually set the last element in marray to the null character.

[weaknessforcats]

Actually, you MUST manually add the \0 as ganon11 says to do.

The basic_string::copy() does not append the \0. It only copies the length specified.

As a minor point, basic_string::length() is deprecated. You are supposed tio use basic_string::size() instead.

[ayan4u]

ok thanx for all suggestions but what do you mean by deprecated....

but again why its working fine with longer strings particularly those containing spaces...

[Ganon11]

Deprecated means that the function is not the latest version; size() is better and more up-to-date. For now, the length() function still exists, but eventually it will be removed from the standard string class.

At least, this is the impression I got about deprecated classes ion Java, and I assume the topics are similar.