How can I determine the size of and number of elements in an array in C?
We can use the C
sizeof operator to discover the size of expressions and data types in bytes. Using
sizeof on an array will return the array’s size in bytes, as below:
size_t array_size = sizeof(my_array);
size_t type is used for sizes returned by
To get the number of elements in our array, we need to divide this value by the size of a single element. Being of the same type, all elements in a C array will also be of the same length, so we can use the first element (
my_array) to do this:
size_t list_length = sizeof(my_array) / sizeof(my_array);
In the background,
size_t is an unsigned integer or unsigned long. Therefore, unless the size of our array is greater than
INT_MAX, we can safely declare
list_length as an
int list_length = sizeof(my_array) / sizeof(my_array);
Loved by over 4 million developers and more than 90,000 organizations worldwide, Sentry provides code-level observability to many of the world’s best-known companies like Disney, Peloton, Cloudflare, Eventbrite, Slack, Supercell, and Rockstar Games. Each month we process billions of exceptions from the most popular products on the internet.
Here’s a quick look at how Sentry handles your personal information (PII).×
We collect PII about people browsing our website, users of the Sentry service, prospective customers, and people who otherwise interact with us.
What if my PII is included in data sent to Sentry by a Sentry customer (e.g., someone using Sentry to monitor their app)? In this case you have to contact the Sentry customer (e.g., the maker of the app). We do not control the data that is sent to us through the Sentry service for the purposes of application monitoring.Am I included?
We may disclose your PII to the following type of recipients:
You may have the following rights related to your PII: