Chapter 09 - Playing with Data Modifiers and Math Functions
In Chapter 4, "Data Types and Names in C," you learned about several data types, such as char, int, float, and double, in the C language. In this hour, you'll learn about four data modifiers that enable you to have greater control over the data. The C keywords for the four data modifiers are
signed
unsigned
short
long
You're also going to learn about several mathematical functions provided by the C language, such as
The sin() function
The cos() function
The tan() function
The pow() function
The sqrt() function
Summary
In this lesson you've learned the following:
- The signed modifier can be used to enable the sign bit for the char and int data types.
- All int variables in C are signed by default.
- The unsigned modifier can be used to disable the sign bit for the char and int data types.
- The memory space taken by a data variable can be reduced or increased by using the short, or long, data modifier respectively.
- There is a set of C library functions, such as sin(), cos(), and tan(), that can be used to perform trigonometric or hyperbolic computations.
- There is another group of math functions in C—for example, pow()—that can perform exponential and logarithmic calculation.
- The sqrt() function returns a non-negative square root. The expression sqrt(x) is equivalent to the pow(x, 0.5) expression, if x has a non-negative value.
- The header file math.h must be included in your C program if you call some math functions defined in the header file.
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