What is the size of string pointer?
If you need the size of the data pointed by a pointer you will have to remember it by storing it explicitly. sizeof() works at compile time. so, sizeof(ptr) will return 4 or 8 bytes typically.
Can you use sizeof on a string?
Data types supported: Sizeof gives actual size of any type of data (allocated) in bytes (including the null values) whereas get the length of an array of chars/string.
How do you find the length of a string with a pointer?
The strlen() Function The strlen() accepts an argument of type pointer to char or (char*) , so you can either pass a string literal or an array of characters. It returns the number of characters in the string excluding the null character ‘\0’ .
Why is sizeof string 32?
In other implementations it is not wet (like Jupiter where it is a gas). So this string implementation is 32 because that’s the way it was built in this implementation and it will by 16 in other implementations and 64 in yet another. The size of the string will (like water) depend on the environment it is used in.
What is the size of string?
So a string size is 18 + (2 * number of characters) bytes. (In reality, another 2 bytes is sometimes used for packing to ensure 32-bit alignment, but I’ll ignore that). 2 bytes is needed for each character, since .
Does sizeof count null terminator?
sizeof : Returns the length of the given byte string, include null terminator; strlen counts the elements until it reaches the null character, in which case it will stop counting. It won’t include it with the length.
Should I use sizeof or strlen?
strlen() is used to get the length of a string stored in an array. sizeof() is used to get the actual size of any type of data in bytes. Besides, sizeof() is a compile-time expression giving you the size of a type or a variable’s type. It doesn’t care about the value of the variable.
Why size of pointer is 8 bytes?
It depends upon different issues like Operating system, CPU architecture etc. Usually it depends upon the word size of underlying processor for example for a 32 bit computer the pointer size can be 4 bytes for a 64 bit computer the pointer size can be 8 bytes.
How do you find the length of a string using strlen?
Use the strlen() function provided by the C standard library string. h header file. char name[7] = “Flavio”; strlen(name); This function will return the length of a string as an integer value.
Why is std::string so big?
The answer to this question is a straight no. To quote the Standard: After reserve() , capacity() is greater or equal to the argument of reserve. So calling reserve() with a number bigger than size() forces std::string to grow.
How do I get the size of a std::string?
std::string::size() is indeed the size in bytes. To get the amount of memory in use by the string you would have to sum the capacity() with the overhead used for management. Note that it is capacity() and not size() .