If statement to check if a variable is in an array?

Question

So I have written the following program with methods: inputArray, selectionSort, binarySearch, and printArray. I am currently working on the main method and am struggling with what to do.

"Write the main method to invoke inputArray, selectionSort, and printArray methods. Next, your main method should ask the user to input a double value to use as a search key and then invoke the binarySearch method. Finally, the main method should print out the location of the key if it is in the list and an appropriate message if the key is not in the list."

How can I print the the index value from the binary search?

@RamanShrivastava I am currently trying to do the following: "Finally, the main method should print out the location of the key if it is in the list and an appropriate message if the key is not in the list." — iOSLife
– iOSLife, Commented Apr 18, 2016 at 21:00
What does binarySearch return if the key is not found? Therein is the answer. — Radiodef
– Radiodef, Commented Apr 18, 2016 at 21:00
Hint: Try starting with int found = binarySearch(array1, key); — OneCricketeer
– OneCricketeer, Commented Apr 18, 2016 at 21:01

shmosel · Accepted Answer · 2016-04-18 21:03:16Z

1

You need to use the return value of the binary search method:

if (binarySearch(array1, key) < 0) {
    // key is not in the array
} else {
    // key is in the array
}

answered Apr 18, 2016 at 21:03

shmosel

51.1k7 gold badges81 silver badges148 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

iOSLife Over a year ago

Wow. I definitely should've been able to think about that lol. My brain is getting fried. Now I am stuck on printing out where the key variable lies in the array. I tried System.out.print("The key is located at " + array1[key] + " in the array."); but it didn't like that. I don't think array1[key] is legal. Could you give me a hint?

shmosel Over a year ago

@BronsonLane see cricket_007's comment to your question.

Collectives™ on Stack Overflow

If statement to check if a variable is in an array?

1 Answer 1

2 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

2 Comments

Your Answer

Sign up or log in

Post as a guest

Related