How to calculate the length of array in C language

This article mainly explains "how to calculate the length of an array in c language". The content of the explanation in this article is simple and clear, and it is easy to learn and understand. let's study and learn "how to calculate the length of an array in c language".

1. For an array in the form of type array [A], the length of the array is obtained by calculating sizeof.

Int len = sizeof (array) / sizeof (array [0])

2. For the two-dimensional array in the form of type array [A] [B], the number of rows / columns of the two-dimensional array is obtained by calculating the sizeof function.

# include#includevoid main () {int rows = 0; / / number of rows int columns = 0; / / number of columns int arr [3] [4] = {{1 arr 3] [4] = {{1 arr [0]) / sizeof (arr [0]) Printf ("array rows:% d columns:% d total number of elements:% d *% d =% d\ n", rows,columns,rows,columns, rows*columns); for (int I = 0 * I