diff --git a/src/master.c b/src/master.c
index b092da8..daeec2e 100644
--- a/src/master.c
+++ b/src/master.c
@@ -1,29 +1,28 @@
 #include "master.h"
 
-#include <stdio.h>		/* C input/output                       */
-#include <stdlib.h>		/* C standard library                   */
-#include <glpk.h>		/* GNU GLPK linear/mixed integer solver */
+#include <stdio.h>
+#include <stdlib.h>
+#include <glpk.h>
 #include <string.h>
 
 #include "sub.h"
 
 
-int col_num = 1;
-int num_col_sp = 1;
-
-
-static void add_column(glp_prob *lp, float coef) {
+static void add_column(glp_prob *lp, float coef, int *num_col) {
 	glp_add_cols(lp, 1);
 	char name[10] = "";
-	snprintf(name, sizeof name, "rouleau%d", col_num);
-	glp_set_col_name(lp, col_num, name);
-	glp_set_col_bnds(lp, col_num, GLP_LO, 0.0, 0.0);
-	glp_set_obj_coef(lp, col_num, coef);
+	snprintf(name, sizeof name, "rouleau%d", *num_col);
+	glp_set_col_name(lp, *num_col, name);
+	glp_set_col_bnds(lp, *num_col, GLP_LO, 0.0, 0.0);
+	glp_set_obj_coef(lp, *num_col, coef);
 
-	col_num++;
+	(*num_col)++;
 }
 
+
 int perfect_rolls() {
+	int num_col = 1;
+
 	/* declare variables */
 	glp_prob *lp;
 	int ia[1 + 1000] = {0}, ja[1 + 1000] = {0};
@@ -41,7 +40,7 @@ int perfect_rolls() {
 		snprintf(name, sizeof name, "taille%d", i);
 		glp_set_row_name(lp, 1, name);
 		glp_set_row_bnds(lp, 1, GLP_LO,  bounds[i-1], 0.0);
-		add_column(lp, 1.0);
+		add_column(lp, 1.0, &num_col);
 		ia[i] = i;
 		ja[i] = i;
 		ar[i] = 1;
@@ -61,7 +60,7 @@ int perfect_rolls() {
 		/* printf("\n"); */
 
 		glp_load_matrix(lp, nb_coeffs, ia, ja, ar);
-		printf("col_num=%d\n", col_num);
+		printf("Colonne %d\n", num_col);
 
 		/* solve problem */
 		glp_simplex(lp, &params);
@@ -70,27 +69,30 @@ int perfect_rolls() {
 		y3 = glp_get_row_dual(lp, 3);
 		y4 = glp_get_row_dual(lp, 4);
 
-		column_generator(y1, y2, y3, y4, a, num_col_sp);
+		puts("Résolution du sous-problème.");
+		column_generator(y1, y2, y3, y4, a);
 		if (a[0] > 1) {
-			fputs("Après résolution du sous-problème, on ajoute : ", stdout);
+			printf("  Valeur de l’objectif : %d\n", a[0]);
+			fputs("  On ajoute : ", stdout);
 			int i = 1;
 			for (i = 1; i < 4; i++) {
 				printf("%d, ", a[i]);
 			}
 			printf("%d\n", a[i]);
 
-			add_column(lp, 1.0);
+			add_column(lp, 1.0, &num_col);
 			for (int i = 1; i < 5; i++) {
-				/* a[col_num, i] = a[i] */
+				/* a[num_col, i] = a[i] */
 				nb_coeffs++;
 				ia[nb_coeffs] = i;
-				ja[nb_coeffs] = col_num-1;
+				ja[nb_coeffs] = num_col-1;
 				ar[nb_coeffs] = a[i];
 			}
 		}
 		else {
 			break;
 		}
+		puts("--------------------------------------------------------------------------------");
 	}
 
 	/* recover and display results */
diff --git a/src/sub.c b/src/sub.c
index e172da0..ce1bd2e 100644
--- a/src/sub.c
+++ b/src/sub.c
@@ -4,18 +4,18 @@
 #include <glpk.h>
 
 
-static void add_column_sp(glp_prob *lp, int num_col_sp) {
+static void add_column_sp(glp_prob *lp, int *num_col_sp) {
 	glp_add_cols(lp, 1);
 	char name[10] = "";
-	snprintf(name, sizeof name, "rouleau%d", num_col_sp);
-	glp_set_col_name(lp, num_col_sp, name);
-	glp_set_col_bnds(lp, num_col_sp, GLP_LO, 0.0, 0.0);
-	glp_set_obj_coef(lp, num_col_sp, 1.0);
-	num_col_sp++;
+	snprintf(name, sizeof name, "rouleau%d", *num_col_sp);
+	glp_set_col_name(lp, *num_col_sp, name);
+	glp_set_col_bnds(lp, *num_col_sp, GLP_LO, 0.0, 0.0);
+	glp_set_obj_coef(lp, *num_col_sp, 1.0);
+	(*num_col_sp)++;
 }
 
 
-void column_generator(int y1, int y2, int y3, int y4, int a[static 4], int num_col_sp) {
+void column_generator(int y1, int y2, int y3, int y4, int a[static 4]) {
 	glp_prob *sous_prob;
 	int ia[1 + 1000];
 	int ja[1 + 1000];
@@ -32,11 +32,11 @@ void column_generator(int y1, int y2, int y3, int y4, int a[static 4], int num_c
 	glp_set_row_name(sous_prob, 1, "taille0");
 	glp_set_row_bnds(sous_prob, 1, GLP_UP,  0.0, 100.0);
 
-	num_col_sp = 1;
+	int num_col_sp = 1;
 
 	const double coeffs[] = {45.0, 36.0, 31.0, 14.0};
 	for (int i = 1; i < 5; i++) {
-		add_column_sp(sous_prob, num_col_sp);
+		add_column_sp(sous_prob, &num_col_sp);
 		glp_set_col_kind(sous_prob, i, GLP_IV);
 		ia[i] = 1;
 		ja[i] = i;
@@ -61,7 +61,6 @@ void column_generator(int y1, int y2, int y3, int y4, int a[static 4], int num_c
 	a[3] = glp_mip_col_val(sous_prob, 3);
 	a[4] = glp_mip_col_val(sous_prob, 4);
 
-	printf("a1 = %d; a2 = %d; a3 = %d; a4 = %d\n", a[1], a[2], a[3], a[4]);
 	/* housekeeping */
 	glp_delete_prob(sous_prob);
 	//glp_intopt(glp_prob *mip, const glp_iocp *parm);
diff --git a/src/sub.h b/src/sub.h
index 5b315c3..bf2d669 100644
--- a/src/sub.h
+++ b/src/sub.h
@@ -2,7 +2,7 @@
 #define SUB_H
 
 
-void column_generator(int y1, int y2, int y3, int y4, int a[static 4], int num_col_sp);
+void column_generator(int y1, int y2, int y3, int y4, int a[static 4]);
 
 
 #endif