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iOS Objective-C Basics (Retired) Pointers and Memory Array Size and Length

Igor Kletsov
Igor Kletsov
7,556 Points
Posted by Igor Kletsov
Igor Kletsov
7,556 Points

Challenge task 3 of 3

Task-3
Print the length of the array real_numbers using the sizeof() function. Your output should look like the following: Array real_numbers can store x items.

his is how I did it:

float real_numbers [] = {1.1, 2.2, 3.3, 4.4, 5.5};  
printf ("Array real_numbers can store %ld items", sizeof(real_numbers)/sizeof(float));

It works everywhere, but: Bummer: Oops! It looks like Task 2 is no longer passing.

What is wrong ?
Screenshots: Task-1 Task-2 Task-3

Amit Bijlani
Amit Bijlani
Treehouse Guest Teacher
Amit Bijlani
Amit Bijlani
Treehouse Guest Teacher

You need to add to the task so don't delete the printf statement from the second task.

4 Answers

simondumalski
simondumalski
3,875 Points

You changed your coding from task 2. You put:

("Array real_numbers can store %ld items", sizeof(real_numbers)/sizeof(float))

When you should have left the task 2 printf statement how it was. Try putting the task 2 printf statement back and creating a new printf statement with the code you had.

Igor Kletsov
Igor Kletsov
7,556 Points
Igor Kletsov
Igor Kletsov
7,556 Points

Thank you. Everything works now!

Igor Kletsov
Igor Kletsov
7,556 Points
Igor Kletsov
Igor Kletsov
7,556 Points

Thanks to all.

I have not noticed: Important: The code you write in each task should be added to the code written in the previous task.

Tolga Beser
Tolga Beser
1,202 Points
Tolga Beser
Tolga Beser
1,202 Points

Step 3 requires both step 2 and step 3 printf statements. The wording is very confusing.

Amit Bijlani
STAFF
Amit Bijlani
Treehouse Guest Teacher
Amit Bijlani
Amit Bijlani
Treehouse Guest Teacher

The task is asking you to print the size of the array in bytes and not the length of the array. When you divide it by sizeof(float) you get the number of items but that's not what the challenge is asking for.

Igor Kletsov
Igor Kletsov
7,556 Points
Igor Kletsov
Igor Kletsov
7,556 Points

Please read carefully : Challenge task 3 of 3 --> "Print the length of the array real_numbers using the sizeof() function. Your output should look like the following: Array real_numbers can store x items."