CS305j Introduction to Computing More Conditional Execution 1 Topic 13 More Conditional Execution " Great dancers are not great because of their technique;

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Presentation transcript:

CS305j Introduction to Computing More Conditional Execution 1 Topic 13 More Conditional Execution " Great dancers are not great because of their technique; they are great because of their passion." -Martha Graham Based on slides for Building Java Programs by Reges/Stepp, found at

CS305j Introduction to Computing More Conditional Execution 2 Logical operators && || !  Boolean expressions can be joined together with the following logical operators:  The following 'truth tables' show the effect of each operator on any boolean values p and q: OperatorDescriptionExampleResult && and(9 != 6) && (2 < 3)true || or(2 == 3) || (-1 < 5)true ! not!(7 > 0)false pqp && qp || q true false true falsetruefalsetrue false p!p truefalse true

CS305j Introduction to Computing More Conditional Execution 3 Using Logical Operators if( 5 <= x <= 10 ) // syntax error if( 5 <= x && x <= 10 ) //okay if( 5 <= x || x <= 10 ) // okay, but...

CS305j Introduction to Computing More Conditional Execution 4 Evaluating Tests int x = 42; int y = 17; int z = 25; y < x && y <= z x % 2 == y % 2 || x % 2 == z % 2 x = y + z !(x < y && x < z) (x + y) % 2 == 0 || !((z - y) % 2 == 0) What is the result of each of the following expressions?

CS305j Introduction to Computing More Conditional Execution 5 More Practice  Write a method to count the number of factors in a positive integer 6 -> 1, 2, > 1, 2, 3, 4, 6, 12  Write a method to determine if a given number is prime, divisible only by itself and 1  Write a program to determine if two numbers are relatively prime, they don't share any factors other than 1.

CS305j Introduction to Computing More Conditional Execution 6 More Practice  Write a program that reads two numbers from the user and tells whether they are relatively prime (have no common factors other than 1). –Examples: Type two numbers: and 16 are relatively prime (run #2) Type two numbers: and 21 are not relatively prime 7 is a factor of 7 and 21