1. Library Functions Goals of software engineering reliable code
accomplished by code reuse
C++ promotes code reuse with predefined classes and functions in the standard library

2. C++ cmath Library Typical mathematical functions
e.g. sqrt, sin, cos, log
Function use in an assignment statement
y = sqrt(x);
Function call
Function name
Function argument

3. Example: sqrt Function
Function sqrt as a “black box”
Square root function
X is 16.0
Result is 4.0

4. Some Mathematical Library Functions

5. Some Mathematical Library Functions (continued)