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Learn Java's Math Class: Essential Methods and User Input Processing

This guide provides an overview of Java’s Math class, focusing on essential methods like abs, pow, and sqrt, which allow basic mathematical operations. It includes a user input prompt to gather a full name, ensuring correctness by prompting for spaces. The program then analyzes the name by counting characters, displaying specific letters, converting to uppercase, checking for letters A and Z, and extracting initial letters. Additionally, a guide for calculating NFL QB ratings based on user input stats is included, reinforcing Java programming skills through practical examples.

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Learn Java's Math Class: Essential Methods and User Input Processing

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  1. Open Powerpoint 1.4 • Also open the assignment Middle

  2. Java’s Math class • Allows you to do basic math functions • Not necessary to import it • 3 methods you must know: • Math.abs(num) // find the absolute value of num • Math.pow(base, exp) // raises base to the exp power • Math.sqrt(num) // finds the square root of num • Demo: MathDemo

  3. Assignments • Review powerpoint 1.4, especially the substring example. • (Lettahs) Prompt the user to enter their full name (on one line, not separately). Then…. • If the user forgot to enter a space, make them try again until they get it right. • Display the number of characters in the name (not including the space). • Display the 1st letter, the 3rd letter, and the last letter (of the full name). • Display the name in all caps. • If the letters A and Z are both in the name, display “both.” • Display the characters from index #4 to (and including) index #6 • Display the characters from index #2 to the end of the name • Display the person’s initials only. • (QBrating) Click here for the NFL QB Rating Formula. (Take note of the line “a, b, c, and d can not…) Also, look up any NFL QB’s 2013 stats (completions, attempts, yards, TDs, and INTs). Then, write a program that asks the user for those 5 stats, and displays the correct QB rating.

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