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Conditional Branching

Conditional Branching. If Be Or Not If Be (then else). booleans hold a true/false value We take advantage of this by using them to decide which route our program will take. Examples: stinky holds the boolean value for whether or not Mr. Mayewsky is stinky.

Conditional Branching

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Presentation Transcript

1. Conditional Branching

2. If Be Or Not If Be (then else) • booleans hold a true/false value • We take advantage of this by using them to decide which route our program will take. • Examples: • stinky holds the boolean value for whether or not Mr. Mayewsky is stinky. • If stinky… then Mr. Mayewsky takes a shower. • redLight holds the boolean value for whether or not the light is red • If redLight… then stop car… otherwise (else) step on it to make the light.

3. If Else Syntax if (boolean){ …code… //executes if boolean is true }else if (boolean2){ …code… //executes if boolean if false //and boolean2 is true }else{ …code… //executes if all booleans are false }

4. Relational Operators • == • equal to • != • not equal to • > • greater than • >= • greater than or equal to • < • less than • <= • less than or equal to • **Only use these with primitive variables!!!!!!!!!!!!!!!!

5. If Else Syntax if (time < 7){ mayewsky.sleep(); }else if (time < 5){ mayewsky.work(); }else{ mayewsky.playComputerGames(); }

6. Boolean Operations • ! – the not operator which will negate the boolean value(true becomes false and vice versa) • && – the and operator which will and two boolean values (both need to be true for the result to be true) • || – the or operator which will or two boolean values (if either is true then the result is true) • Order of Operation: ! Then && Then ||

7. If Else Syntax if (time < 7 || isWeekEnd && time < 10){ mayewsky.sleep(); }else if (time < 5 && !isWeekEnd){ mayewsky.work(); }else if(!isWeekEnd){ mayewsky.playComputerGames(); }else{ mayewsky.watchFootball();

8. Nesting • You can put an if statement inside another if statement • This can be used to better organize your code. • It makes it both easier to write, read, and edit!

9. If Else Syntax if (isWeekEnd)){ if (time < 10){ mayewsky.sleep(); }else{ mayewsky.watchFootball(); } }else{ if (time < 7){ mayewsky.sleep(); }else if (time < 5){ mayewsky.work(); }else{ mayewsky.playComputerGames(); } }

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