Data Structures Using C, 2nd Edition by Pearson

18 Data Structures Using C

1.9.5 Some Special Operators

There are many other operators in C. In this section, the two frequently used operators—sizeof and

comma operators—have been discussed.

1. Sizeof operator: C provides a compile time unary operator called sizeof which, when applied

on an operand, returns the number of bytes the operand occupies in the main memory. The

operand could be a variable, a constant or a data type. For example, the following expressions:

a 5 sizeof (“sum”);

b 5 sizeof (char);

c 5 sizeof (123L);

would return the sizes occupied by variables sum, data type char and constant ‘123L’ on your machine.

It may be noted tha