Welcome to the Treehouse Community

The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support. Collaborate here on code errors or bugs that you need feedback on, or asking for an extra set of eyes on your latest project. Join thousands of Treehouse students and alumni in the community today. (Note: Only Treehouse students can comment or ask questions, but non-students are welcome to browse our conversations.)

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today.

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

Shaun Kelly
Shaun Kelly
5,648 Points

Having trouble with finding the length of this array for a code challenge.

It's saying that I have the format character wrong?

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));

1 Answer

Stone Preston
Stone Preston
42,016 Points

to find the length of an array (the number of items it stores, not the size in bytes) you need to divide the size of the array by the size of the data type of the array. In this case your array stores floats, so divide the sizeof the array by the size of the float data type:

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)/sizeof(float));