The void Data Type in C Programming

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 if-else Statement

The if statement

The if statement

If life were a straight line, it would be very boring. The same thing is true for programming. It would be too dull if the statements in your program could only be executed in the order in which they appear.

Mathematical Functions in C

Mathematical Functions in C

Basically, the math functions provided by the C language can be classified into three groups:

Trigonometric and hyperbolic functions, such as acos(), cos(), and cosh().

Changing Data Sizes

Changing Data Sizes

Enabling or Disabling the Sign Bit

Enabling or Disabling the Sign Bit

As you know, it's very easy to express a negative number in decimal. All you need to do is put a minus sign in front of the absolute value of the number. But how does the computer represent a negative number in the binary format?