#include <stdlib.h>
#include <stdio.h>
#include <time.h>
#include <pthread.h>

#ifndef N /* nombre de lignes des matrices */
#define N 10
#endif

void imprime(int matrice[N][N]);
void generation_aleatoire(int matrice[N][N]);

int A[N][N], B[N][N], R[N][N];

int main(void)
{
	struct timespec tic, toc;
	double duree;
	int i, j, k;

	srand(time(NULL));
	generation_aleatoire(A);
	generation_aleatoire(B);
	// imprime(A);
	// puts("");
	// imprime(B);
	// puts("");
	clock_gettime(CLOCK_REALTIME, &tic);

	for (i = 0; i < N; ++i) {
		for (j = 0; j < N; ++j) {
			R[i][j] = 0;
			for (k = 0; k < N; ++k)
				R[i][j] += A[i][k] * B[k][j];
		}
	}

	clock_gettime(CLOCK_REALTIME, &toc);
	duree = (toc.tv_sec - tic.tv_sec);
	duree += (toc.tv_nsec - tic.tv_nsec) / 1000000000.0;
	printf("durée : %g\n", duree);
	// imprime(R);
	return 0;
}

void imprime(int matrice[N][N])
{
	int i, j;
	for (i = 0; i < N; ++i)
		for (j = 0; j < N; ++j)
			printf("%d%c", matrice[i][j], j == N - 1 ? '\n' : '\t');
}

void generation_aleatoire(int matrice[N][N])
{
	int i, j;
	for (i = 0; i < N; ++i)
		for (j = 0; j < N; ++j)
			matrice[i][j] = rand() % 10;
}