Week 4 - Decisions

# Condition statement1 statement3 start evaluate

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Unformatted text preview: cs of if - else if (condition) { statement1; } else { statement2; } statement3; •  statement1 happens if condition is true •  statement2 happens if condition is false •  statement1 and statement2 will both never execute •  statement3 is always executed afterwards 10 Skipping else if (condition) { statement1; } statement3; Start Evaluate condition true false Run statement1 Run statement3 11 Code blocks •  Code can be grouped into blocks –  All lines of code (statements) are executed (sequentially) together –  Syntax: { statement1; statement2; statement3; … } 12 Introduction to Boolean Expressions •  The value of a boolean expression is either true or false •  Examples num > 0 num < 20 balance <= 0 time < limit 13 Comparison operators Math English notation = ≠ > ≥ < ≤ Java Java example notation Equal to Not equal to Greater than Greater than or equal to Less than Less than or equal to == != > >= < <= grade == 95 answer != 42 input > 0 notNegative >= 0 change < DOLLAR negative <= - 1 Taken from page 145 of the textbook 14 Math is not Java •  Comparison operators –  Binary operators –  Work from left to right –  How does this evaluate? 0 < score <= 100 15 Math is not Java If score is 95… 0 < score <= 100 true <= 100 Does not compute?! 16 Solution Logical operators combine 2 boolean ex...
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