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Before we start, did you try solving the workbook yourself?

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If not, please click the link in the resources folder and follow the instructions for this workbook.

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Welcome to Workbook 6.11.

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Task one is to create a function called Celsius the Fahrenheit.

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So we start with the usual public static.

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The function name is Celsius, the Fahrenheit.

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The function will receive an array of values in Celsius.

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So it's going to receive an array of type double.

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That store is Celsius temperatures.

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And upon receiving an array of Celsius temperatures, it's going to return an array of Fahrenheit temperatures.

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So it will also return an array of type double.

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All right.

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And inside the function, we need to create a double array called Fahrenheit.

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So double.

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Fahrenheit, because I'm assuming we have to convert all of the Celsius values in here to Fahrenheit.

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Then this array is going to have the same length as the array that gets passed in.

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Oh, right.

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The function copies every value from the Celsius parameter to the Fahrenheit array.

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So what we can do is run through the length of our Fahrenheit array.

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The loop will keep running so long is I is smaller than Fahrenheit length.

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I a plus plus.

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And for every single element that we index, we set it equal to a Celsius temperature.

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All right.

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But we don't want to just copy over the Celsius value.

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We want to convert it first.

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So in bullet point three, we need to use the formula below to convert every value to Fahrenheit.

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So using this formula, we can convert the Celsius value to Fahrenheit before putting it in our Fahrenheit

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array.

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So Celsius I divided by five.

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Times nine.

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Plus 32.

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So first we convert whatever Celsius value that we're currently looping through to Fahrenheit, and

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then we store the result as an element in the Fahrenheit array.

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And after we've converted every single Celsius temperature to Fahrenheit, we can return the result.

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So we can return the resulting Fahrenheit array, and we are finished with our function.

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Task two The starter code contains an array of Celsius values.

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It definitely does use your function to return an array of Fahrenheit values from the Celsius array,

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so we can call Celsius the Fahrenheit.

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Passing in this array, which will convert every single Celsius value to Fahrenheit.

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It will return an array of doubles, which we store here.

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All right.

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And now we can print the contents of Fahrenheit using arrays to string.

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So here, we'll say.

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System.out.println.

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Arrays.

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Two string.

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Fahrenheit.

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I'm not going to visualize the runtime just yet.

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Let us just say Java Sea Weather Dot.

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Java.

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Java Weather.

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Compare what we have to what's on.

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Learn the part.

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54.5 68.

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All right.

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Looks like we're doing good.

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And now task three tells us to remove our print statement.

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Instead, create a function that receives a double array and a string.

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All right.

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And we'll delete that.

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Public static.

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The function is void.

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It's going to be called, I believe, print temperatures.

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It will receive a double array called.

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Temp.

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So this could be an array of Celsius temperatures, an array of Fahrenheit temperatures, which means

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we need another parameter, temp type that tells us what is the array that is currently being passed

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in.

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The function prints the temperature type using print, not print line.

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Okay, we can just copy this over.

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Simple enough.

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The function uses a four loop to print.

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The temperature is on the same line.

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So you already know we need to create a for loop that runs through the length of whatever array gets

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passed in.

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This loop will keep running so long as AI is smaller than temp length I plus plus, and during each

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run we need to print the temperature that's currently being looped through and we can use this print

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statement.

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To print all of the temperatures that we iterate through on the same line.

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OC.

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And the function prints a new line after the loop.

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Perfect.

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All right.

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And now after we finish task four, then we will visualize the runtime so that we can do it all in one

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go.

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Print temperatures.

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And we're good.

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I'll put one breakpoint here, one here and one here.

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And I guess we don't need this anymore.

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Okay, Let us clean up a little.

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Close.

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This terminal that I'm not using will minimize the following.

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All right.

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I'm going to step inside of Celsius.

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The Fahrenheit.

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So here we pass in an array of seven temperatures.

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Our parameter receives that array and stores it.

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Here we're setting double Fahrenheit, equal to a new double array that shares the same length as our

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Celsius parameter.

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So this will also have seven elements, but by default they're all going to start off as zero.

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So this four loop is going to run through the length of our Fahrenheit array.

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I start at zero.

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The Celsius temperature index zero is 12.5, 12.5 divided by five is 2.5 times nine is 22.5 and plus

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32 is 54.5.

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Which means we're setting the Fahrenheit element at Index zero equal to 54.5, the converted Fahrenheit

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temperature.

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And we keep doing that throughout.

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So now the index equals one.

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The Celsius temperature at index one is 14.5, 14.5.

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Convert it to Fahrenheit is going to equal.

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58.1.

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Now I equals to the element that index two is 1717 convert it to Fahrenheit is going to equal.

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62.6 and this will keep on going until the loop runs to completion.

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And just like that, we've converted every single Celsius value to Fahrenheit and stored it in another

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array.

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That same array ends up being the return value.

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The function call Celsius Fahrenheit retains the array that was returned.

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Beautiful.

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So now we've got two arrays.

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One that store is at cell C temperatures, one that stores Fahrenheit temperatures.

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First, we're passing the Celsius array into print temperatures.

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All this is doing is printing the temperature type, which in this case we passed in Celsius.

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Beautiful.

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And this for loop is just going to run through the length of the array that was passed in and print

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each element on the same line.

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And after the loop ran to completion, it prints a new line.

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And the same thing is going to happen for the Fahrenheit array.

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So I'm just going to step over this and we are done.