# Mr Baumgarten

Computer Science teacher and self confessed geek

# Java: Selection ("if")

Having determined how to have Java compare values one against the other, we can now build on that by using `if` statements to selectively execute code based on the result of the comparison.

The overall syntax is:

``````if ( condition ) {
doSomething;
doSomething;
} else if ( condition ) {
doSomething;
doSomething;
} else {
doSomething;
doSomething;
}
``````

Let's make a simple example:

``````boolean result;
java.util.Scanner keyb = new java.util.Scanner(System.in);
System.out.print("a: ");
double a = keyb.nextDouble();
System.out.print("b: ");
double b = keyb.nextDouble();

if ( a == b ) {
System.out.println("a and b are equal");
} else if (a < b) {
System.out.println("a is less than b");
} else {
System.out.println("a is greater than b");
}
``````

## Problem set: Selection

Visit https://codingbat.com/java and complete the Logic-1 and Logic-2 exercises.

Note: To pass the CodingBat auto-marker, your code will need to return an answer rather than print it using a function like System.out.println().

For example, to provide a correct answer to the `cigarParty` problem, use return() as below.

``````public boolean cigarParty(int cigars, boolean isWeekend) {
if (isWeekend && cigars >= 40) {
return(true);
} else if (cigars >= 40 && cigars <= 60) {
return(true);
} else {
return(false);
}
}
``````