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The Size of an Array

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Bengalstudents ...Sat, 09/03/2013 - 11:55pm

The Size of an Array

As mentioned earlier in this lesson, an array consists of consecutive memory locations. Given an array, like this:

data-type Array-Name[Array-Size];

you can then calculate the total bytes of the array by the following expression:

sizeof(data-type) * Array-Size

Here data-type is the data type of the array; Array-Size specifies the total number of elements the array can take. The result returned by the expression is the total number of bytes the array takes.

What Is an Array?

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Bengalstudents ...Sat, 09/03/2013 - 11:51pm

What Is an Array?

You now know how to declare a variable with a specified data type, such as char, int, float, or double. In many cases, you have to declare a set of variables that have the same data type. Instead of declaring them individually, C allows you to declare a set of variables of the same data type collectively as an array.

Exercises : Answer the following Question

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Admin BengalStudentsFri, 08/03/2013 - 12:42am

To help solidify your understanding of this hour’s lesson, you are encouraged to answer the quiz questions and finish the exercises provided in the Workshop before you move to the next lesson. The answers and hints to the questions and exercises are given in Appendix E, “Answers to Quiz Questions and Exercises.”

Question and Answer

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Admin BengalStudentsFri, 08/03/2013 - 12:40am

Question and Answer

Q What are the left and right values?

A The left value refers to the address of a variable, and the right value refers to the content stored in the memory location of a variable. There are two ways to get the right value of a variable: use the variable name directly, or use the left value of the variable to refer to where the right value resides. The second way is also called the indirect way.

Q How can you obtain the address of a variable?

The Dereference Operator (*)

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Admin BengalStudentsFri, 08/03/2013 - 12:37am

The Dereference Operator (*)

You’ve seen the asterisk (*) in the declaration of a pointer. In C, the asterisk is called the dereference operator when it is used as a unary operator. (Sometimes, it’s also called the indirection operator.) The value of a variable can be referenced by the combination of the * operator and its operand, which contains the address of the variable.

Declaring Pointers

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Admin BengalStudentsFri, 08/03/2013 - 12:34am

Declaring Pointers

As mentioned at the beginning of this lesson, a pointer is a variable, which means that a pointer has a left value and a right value as well. However, both the left and right values are addresses. The left value of a pointer is used to refer to the pointer itself, whereas the right value of a pointer, which is the content of the pointer, is the address of another variable.

The general form of a pointer declaration is

data-type *pointer-name;

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