How to find the length of a structure in C using sizeof?

In the C language, the sizeof operator can be used to determine the size of a structure. The sizeof operator calculates the number of bytes occupied by a variable, constant, or type. The length of a structure is equal to the total length of its member variables, including padding bytes.

For example, suppose we have the following structure definition:

struct Student {
    int id;
    char name[20];
    float score;
};

To obtain the size of the structure Student, you can use the sizeof operator.

struct Student student;
int length = sizeof(student);

In the example above, the length variable will contain the size of the Student struct in bytes. Note that the sizeof operator returns a value of type size_t, which represents the number of bytes occupied.