Week 4 - Decisions

Group statements blocks style rule use indentation to

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Unformatted text preview: tolerance < # < answer + tolerance –  In the previous example we used 0.01 as the tolerance 30 Equality with Strings •  Strings have hidden abilities (methods) –  Accessed with the dot (.) after the identi er –  One is the equals method –  Another is the equalsIgnoreCase method •  Syntax string1.equals(string2) string1.equalsIgnoreCase(string2) 31 Example final String correctUserName = "ttrojan"; String username = ""; Scanner keyboard = new Scanner(System.in); System.out.print("Please enter your name: "); userName = keyboard.nextLine(); if (userName.equals(correctUserName)) { System.out.println(“Valid user name”); } else { System.out.println(“Invalid”); } 32 Nested if- else Statements •  An if- else statement can contain any sort of statement within it •  In particular it can contain another if- else statement –  An if- else may be nested within the if part –  An if- else may be nested within the else part –  An if- else may be nested within both parts 33 Nested Statements if (condition1) { if (condition2) { statement1; } else { statement2; } } else { if (condition3) { statement3; } else { statement4; } } Do this if condition1 is true Do this if condition1 is false 34 Nested Statements •  Each else is paired with the nearest unmatched if •  Braces are used group statements (blocks) •  Style rule –  Use indentation to show which if goes with which else 35 Nested Statements •  Subtly different forms int x = 0; int x = 0; if (a > b) { if (c > d) x = 1; } else x = 2; if (a > b) if (c > d) x = 1; else x = 2; 36 Multibranch if- else Statements if (condition1) { statement1;...
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