Does a break is required by default case in switch statement?

If the structure/union variable is a pointer variable, to access structure/union elements the arrow operator is used.

We can create integer structure members of differing size apart from non-standard size using bit fields. Such structure size is automatically adjusted with the multiple of integer size of the machine.

The arguments which we pass to the main() function while executing the program are called as command line arguments. The parameters are always strings held in the second argument (below in args) of the function which is array of character pointers. First argument represents the count of arguments (below in count) and updated automatically by operating system.

It compares two strings by ignoring the case.

Opens a file both for reading and writing. If a file is not existing it creates one, else if the file is existing it will be over written.

It cannot be used on constants. It cannot be used on variable which are declared using register storage class.

No, it is a structure defined in stdio.h.

Error, It is invalid that either of the operands for the modulus operator (%) is a real number.

There is only one operator and is conditional operator (? : ).