What are the rules for multiplying matrices in the C language?

In C language, the rule for multiplying matrices is that each element C[i][j] of the result matrix C is equal to the sum of the products of corresponding elements of the ith row of matrix A and the jth column of matrix B. The specific formula is as follows:

C at position i and j is equal to the sum of the product of each element in row i of matrix A and each element in column j of matrix B.

In this case, n represents the number of columns in matrix A and the number of rows in matrix B. The dimensions of matrix C are determined by the number of rows in matrix A and the number of columns in matrix B.