COSI 11a Chapter Notes - Chapter 5: Texas State Highway Loop 1, Operand, Institute For Operations Research And The Management Sciences
22 May 2018
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Chapter 5 Outline
Program Logic and Indefinite Loops
Pages 301 – 372
I. The while Loop
A. Random Numbers
1. Math.random() can be used to obtain a number between 0 and 1, including 0 but not including
1.
2. The java.util package contains a random class with methods nextInt(), nextInt(max),
nextDouble(), and nextBoolean(). The nextInt method is passed a maximum number from which
0 (inclusive) to max (exclusive) the random number is chosen. To use the random class, a
random object must be created:
Random r = new Random();
B. do/while Loop
1. do/while loops are useful when you have to execute a loop at least once.
II. The Boolean Type
A. Logical Operators
1. The NOT operator (!) reverses the value of the operand, such as !(2==2) resulting in false.
III. User Errors
A. Scanner Lookahead
1. Every next method in the Scanner class has a corresponding has method.
2. The has method of the Scanner class informs the user whether or not the operation can be
performed.
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