Submitted by tushar pramanick on Mon, 02/25/2013 - 12:36

The void Data Type

You may notice that the void word has been added into the C program in Listing 2.2. void is a keyword for a data type in C. When a void is placed prior to a function name, it indicates that the function does not return a value.

As you have learned, the exit() function does not return any values, but, by default, the main() function does. Therefore, as shown in line 5 of Listing 2.2, void is used to modify the returning data type of main() and to make the main() function not return any value. (You'll learn more about data types in C in Hours 4, "Data Types and Names in C," and 18, "More Data Types and Functions.")

 

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The while Loop

The while Loop

The while statement is also used for looping. Unlike the situation with the for statement, there is only one expression field in the while statement.

The general form of the while statement is

while (expression) {

Question and Answer

Question and Answer

    Q How does a for loop work?

Exercises : Answer the following Question

To help you solidify your understanding of this hour's lesson, you are encouraged to try to answer the quiz questions and finish the exercises provided in the Workshop before you move to the next lesson.

 

Working with the Cast Operator

Playing with the Cast Operator

In C, you can convert one data type to a different one by prefixing the cast operator to the operand.

The general form of the cast operator is

(data-type)x

Question and Answer

Question and Answer

    Q What is the difference between the pre-increment operator and the post-increment operator?