Lecture Fundamentals of computing 1: Lecture 4 introduce the conditional expression. This chapter presents the following content: The if statements, the if/else statements, the switch statements. | Lecture Title: Conditional Expression Fundamentals of Computing 1 Agenda The if statements The if/else statements The switch statements ask them, how might the computer store "hi" using binary digits? (some kind of mapping; ASCII) The if statement Executes a block of statements only if a test is true if (test) { statement; . statement; } Example: Agenda The if statements The if/else statements The switch statements ask them, how might the computer store "hi" using binary digits? (some kind of mapping; ASCII) The if/else statement Executes one block if a test is true, another if false if (test) { statement(s); } else { statement(s); } Example: Relational expressions Tests use relational operators: Operator Meaning Example Value == equals 1 + 1 == 2 true != does not equal != true greater than 10 > 5 true = greater than or equal to >= true Note that == tests equality, not = . The = is used for the assignment operator! Misuse of if Scanner console = new Scanner(); ("What percentage did you earn? "); int percent = (); if (percent >= 90) { ("You got an A!"); } if (percent >= 80) { ("You got a B!"); } if (percent >= 70) { ("You got a C!"); } if (percent >= 60) { ("You got a D!"); } if (percent 0) { ("Positive"); } else if (x Nested if/else/if If it ends with else, exactly one path must be taken. If it ends with if, the code might not execute any path. if (test) { statement(s); } else if (test) { statement(s); } else if (test) { statement(s); } . | Lecture Title: Conditional Expression Fundamentals of Computing 1 Agenda The if statements The if/else statements The switch statements ask them, how might the computer store "hi" using binary digits? (some kind of mapping; ASCII) The if statement Executes a block of statements only if a test is true if (test) { statement; . statement; } Example: Agenda The if statements The if/else statements The switch statements ask them, how might the computer store "hi" using binary digits? (some kind of mapping; ASCII) The if/else statement Executes one block if a test is true, another if false if (test) { statement(s); } else { statement(s); } Example: Relational expressions Tests use relational operators: Operator Meaning Example Value == equals 1 + 1 == 2 true != does not equal != true greater than 10 > 5 true = greater than or equal to >= true Note that == tests equality, not = . .
