please explain line by line thanks

In this assignment, you will do a couple of C programming exercises. 1. Matrix multiplication (matrixmul.c): Given an n x k matrix A and an kx m matrix B, with 1snm,ks300, write a C program that computes the matrix product C=AB. All entries in matrices A and B are integers with abolute value less than 1000, so you don't need to worry about overflow. If matrices A and B do not have the right dimensions to be multiplied, the product matrix C should have its number of rows and columns both set to zero. Input/Output: please use scanf and printf to handle the data input and output. Input format: Line 1: Two space-separated integers, n and k. Line 2 to n+1: Each line contains k integers separated by sapces: Each row of matrix A. Line n+2: Two space-separated integers, k and m. Line n+3 to n+k+4: Each line contains m integers separated by spaces: Each row of matrix B. Sample Input: 32 11 12 -40 23 121 321 Output format: Line 1: two space-separated n and m, the dimension of matrix C. Line 2 to m+1: Each line contains m space-separated integers: Each row of matrix C. Sample Output: 33 442 763 -4-8-4