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

Caleb Kleveter
MOD
Caleb Kleveter
Treehouse Moderator 37,862 Points

What are they telling me in this warning?

I'm on stage 2 of this code challenge and I'm supposed to:

Using the printf function print the size in bytes of the variable real_numbers. your output should look like the fallowing: Array real_numbers is x bytes.

I put in:

printf("real_numbers %ld bytes\n", sizeof(real_numbers));

but a bummer message pops up that says:

That was not the correct string. do you have the correct for mat character? sizeof(real_numbers) returns a long. That format character is %ld.

what does this mean and what should I do about it?

4 Answers

Stone Preston
Stone Preston
42,016 Points

the challenge states: your output should look like the fallowing: Array real_numbers is x bytes.

your printf statement looks like this:

printf("real_numbers %ld bytes\n", sizeof(real_numbers));

which means your output is going to look like this:

real numbers x bytes

where x is going to be the size of real_numbers.

so the error basically says "real numbers x bytes" is not "Array real_numbers is x bytes"

you need to change the string in your print f statement:

printf("Array real_numbers is %ld bytes\n", sizeof(real_numbers));
Caleb Kleveter
MOD
Caleb Kleveter
Treehouse Moderator 37,862 Points

I tried that and it didn't work.Does it have to do with the 1st part of the challenge? Here is what that code looks like:

float real_numbers[] = {1, 2, 3, 4, 5 };

Stone Preston
Stone Preston
42,016 Points

i just tried it and it worked fine. make sure you keep the task 1 code there as well

float real_numbers[] = {1, 2, 3, 4, 5 };
printf("Array real_numbers is %ld bytes\n", sizeof(real_numbers));