Matrix Calculus in C++ - Multiplying Two Matrices

#include< stdio.h> 
#include< stdlib.h> 
#include < iostream> 
using namespace std; 
typedef struct matrix
{
 int line; 
 int column; 
 int** data; 
}matrix; 
struct matrix creer_matrice(int row, int column){
 struct matrix m;
 m.row = row; 
 m.column = column; 
 m.data = (int**)malloc(m.line*sizeof(int *)); 
 for(int i = 0; i< m.row; ++i){
 // initialize the boxes to 0 with calloc
 m.data[i] = (int *)calloc(m.column,sizeof(int)); 
 }
 return m;
}

void afficher_matrice(matrix M){
 for(int i = 0; i < M.line; i++) {
 for(int j = 0; j < M.colonne; j++) {
 cost < < M.data[i][j] ; 
 cost < < "\t"; 
 }
 //line break
 cost < < "\n"; 
 }
 cost < < "\n"; 
}

struct product matrix(matrix A, matrix B)
{
 matrix C = creer_matrice(A.row, B.column); 
 for(int I = 0; I < A.line; I++)
 for(int J = 0; J < B.column; J++)
 {
 C.data[I][J] = 0; 
 for(int K = 0; K < A.column; K++)
 {
 C.data[I][J] += A.data[I][K] * B.data[K][J]; 
 }
 }
 return C;
}

int main(int argc, char *argv[])
{
 /*
 matrix A
 */
 matrix A = creer_matrice(4,3); 
 srand(time(NULL)); 
 for(int i=0; i< A.line; i++)
 for(int j=0; j< A.column; j++)
 //Generate random numbers between 0 and 20 and subtract 10
 //to get negative numbers
 //e.g.: if rand generates 74 then 74-100 = -36
 A.data[i][j] =rand()%20-10; 
 afficher_matrice(A); 
 
 /*
 2nd matrix
 */
 matrix B = creer_matrice(3.5); 
 srand(time(NULL)); 
 for(int i=0; i< B.line; i++)
 for(int j=0; j< B.column; j++)
 //Generate random numbers between 0 and 20 and subtract 10
 //to get negative numbers
 //e.g.: if rand generates 74 then 74-100 = -36
 B.data[i][j] =rand()%20-10; 
 afficher_matrice(B); 
 
 //product
 //matrix C = product(A,B); 
 //afficher_matrice(C); 
 afficher_matrice(power(A)); 
 system("pause"); 
}