Size of string

[akash16]

Please have a look to below code:

    char* str = "akash";
    string st = "akash";

    cout<<"Size of char* : "<<sizeof(str)<<endl;            // 4
    cout<<"Length of str : "<<strlen(str)<<endl<<endl;      // 5
    
    cout<<"Size of string : "<<sizeof(st)<<endl;            // 32
    cout<<"Length of string : "<<st.length()<<endl;         // 5
    

OutPut:

Size of char* : 4
Length of str : 5

Size of string : 32
Length of string : 5

Why the size of string object is 32?

Please reply... :)

[coder777]

The sizeof() on line 7 tells you that the complex string structure requires 32 bytes. It has nothing to do with the data (the c string) of that string.

[akash16]

Yeh that is my question.
Why String object takes 32 bytes?

[Peter87]

It depends on how the string class is implemented. When I compile your code with GCC it says sizeof(st) is 8. If you really want to know you'll have to look inside the code for std::string that your compiler is using.

[coder777]

It depends on the implementation of string. If you want to find out why exactly 32 bytes you need to find out what member variables that class harbors.

[akash16]

Yeh I got it. Thanks all.

[Swapnil2000]

Mark as Solved please bro..