The macro va_arg is used to extract an argument from the variable argument list and advance the pointer to the next argument.

In a function that receives variable number of arguments the fixed arguments passed to the function can be at the end of argument list.

A function that receives variable number of arguments should use va_arg() to extract arguments from the variable argument list.

For a function receives variable number of arguments it is necessary that the function should receive at least one fixed argument.

A function that receives variable number of arguments should use va_arg() to extract the last argument from the variable argument list.