How do you define a two-dimensional array in the C language?

In C language, when defining a two-dimensional array, the number of rows and columns must be specified. The way to define a two-dimensional array is as follows:

数据类型 数组名[行数][列数];

For example, you can define a 3×4 integer 2D array like this.

int arr[3][4];

In this case, arr is the name of the array, 3 is the number of rows in the array, and 4 is the number of columns in the array. You can define two-dimensional arrays of different sizes based on your actual needs.