Week5Chap4-II - Chapter 4 Control Statements in Java...

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Janaka Balasooriya CSE 110, Arizona State University Chapter 4 Control Statements in Java Selection
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Quick Recap Java provides control structures to facilitate Selection and Repetition . Selection and Repetition involve in decision making during the execution of the program Decisions are made by evaluating logical expressions Logical expressions are constructed using relational operators such as <, >, <=, >=, != and ==. Logical expressions produce Boolean values (true/false) Logical operators (!, &&, ||) can be used to combine logical expressions Arithmetic operators have the higher precedence over relational and logical operators Example (4 * 3 +2 > 6) && (8+3 < 0) What is the final truth value ? Janaka Balasooriya CSE 110, Arizona State University
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Selection Janaka Balasooriya CSE 110, Arizona State University
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Janaka Balasooriya CSE 110, Arizona State University One Way Selection expression statement Java code (syntax): if (logical expression) statement (s) Example: int myNumber; Scanner keyboard = new Scanner (System.in); myNumber =keyboard.nextInt(); if(myNumber < 0) Sytem.out.println (“a negative number”); True False
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  • Fall '08
  • KIM
  • Logic, Phoenix, Arizona, Janaka Balasooriya

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