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

http://teamtreehouse.com/library/objectivec-basics/pointers-and-memory/array-size-and-length

Help me solve this

6 Answers

Hi Jonathan,

You have the correct output string and format specifier. The only problem is that printf is expecting a second argument so that it can take that value and place it where you have the %ld

It's asking you to print the size of the array. You want to use the sizeof operator

printf ("Array real_numbers is %ld bytes.", sizeof(real_numbers));

lordcozycat
lordcozycat
11,940 Points

Please elaborate on your issue. It wouldn't be good for your learning if we simply handed you the answers :) Which task are you having troubles with?

float real_numbers[5];

Thanks for your answers. I'm trying to solve task 2 Here is my code:

float real_numbers[] = {1.1, 1.2, 1.3, 1.4, 1.5}; printf("Array real_numbers is %ld bytes");

Got it. Thanks for your help. Here is the final code for task 2. float real_numbers[5]; printf("Array real_numbers is %ld bytes", sizeof(real_numbers));

thanks,

I'm trying to solve task 3 now Here is my code: <p> float real_numbers[5]; printf("Array real_numbers is %ld bytes", sizeof(real_numbers)); printf("Array real_numbers can store %ld items", sizeof(real_numbers)); </p> what's wrong with my code

You want to divide the total size of the array by the size of a float to get the number of items.

sizeof(real_numbers) / sizeof(float)