C++ Special Operators

Special Operators in C++

C++ language supports some special operators such as comma operator, sizeof operator, pointer operators (& and *), and member selection operators (. and ->). pointer operators will be discussed while introducing pointers and member selection operators will be discussed with structures and union. Right now, we will discuss comma operator and sizeof operator.

(a) Comma Operator  

                This operator is used to link the related expressions together.

              Example:  int val, x, y;

                        value = (x = 0, y = 5, x+y);

                It first assigns 10 to x, then 5 to y, finally sum x+y to val.

(b)          (b) sizeof Operator  

                The sizeof operator is a compile time operator and when used with an operand, it returns the number of bytes the operand occupies. The operand may be a variable, a constant or a data type qualifier.

Example: int n;

                n = sizeof (int);

                cout<<n;

        output:         n = 2                /* Assuming that int size is 2 bytes */