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    Copyright
    Preface
    Ch. 1. Getting Started
    Ch. 2. Making the Sketch Do Your Bidding
    Ch. 3. Using Mathematical Operators
    recipe 3.1. Introduction
    recipe 3.2. Adding, Subtracting, Multiplying, and Dividing
    recipe 3.3. Incrementing and Decrementing Values
    recipe 3.4. Finding the Remainder After Dividing Two Values
    recipe 3.5. Determining the Absolute Value
    recipe 3.6. Constraining a Number to a Range of Values
    recipe 3.7. Finding the Minimum or Maximum of Some Values
    recipe 3.8. Raising a Number to a Power
    recipe 3.9. Taking the Square Root
    recipe 3.10. Rounding Floating-Point Numbers Up and Down
    recipe 3.11. Using Trigonometric Functions
    recipe 3.12. Generating Random Numbers
    recipe 3.13. Setting and Reading Bits
    recipe 3.14. Shifting Bits
    recipe 3.15. Extracting High and Low Bytes in an int or long
    recipe 3.16. Forming an int or long from High and Low Bytes
    Ch. 4. Serial Communications
    Ch. 5. Simple Digital and Analog Input
    Ch. 6. Getting Input from Sensors
    Ch. 7. Visual Output
    Ch. 8. Physical Output
    Ch. 9. Audio Output
    Ch. 10. Remotely Controlling External Devices
    Ch. 11. Using Displays
    Ch. 12. Using Time and Dates
    Ch. 13. Communicating Using I2C and SPI
    Ch. 14. Wireless Communication
    Ch. 15. Ethernet and Networking
    Ch. 16. Using, Modifying, and Creating Libraries
    Ch. 17. Advanced Coding and Memory Handling
    Ch. 18. Using the Controller Chip Hardware
    Appx. A. Electronic Components
    Appx. B. Using Schematic Diagrams and Data Sheets
    Appx. C. Building and Connecting the Circuit
    Appx. D. Tips on Troubleshooting Software Problems
    Appx. E. Tips on Troubleshooting Hardware Problems
    Appx. F. Digital and Analog Pins
    Appx. G. ASCII and Extended Character Sets
    Colophon
    Index
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    Help

    Chapter 3. Using Mathematical Operators > Rounding Floating-Point Numbers Up an...

    recipe 3.10. Rounding Floating-Point Numbers Up and Down

    3.10.1. Problem

    You want the next smallest or largest integer value of a floating-point number (floor or ceil).

    3.10.2. Solution

    floor(x) returns the largest integral value that is not greater than x. ceil(x) returns the smallest integral value that is not less than x.


      

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