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Page 1: lemaire/S6PDS/documents/coursc.Anne.Canteaux.pdf · R! #" $ &%('*) ,+- #". / 0214365 1702198:0A@CBED@75EFGF?5IHCJKBMLN0LPO Q HcC H RTS Yv984P2 SVU W 37 C X HcC S \ 9Y

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1 #include <stdio.h>2 #include <stdlib.h>3

4 /* declaration des fonctions secondaires */5 int **lecture_matrice(unsigned int, unsigned int);6 void affiche(int **, unsigned int, unsigned int);7 int **produit(int **, int **, unsigned int, unsigned int, unsigned

int, unsigned int);8

9 int **lecture_matrice(unsigned int nb_lignes, unsigned int nb_col)10 {11 int **M;12 int i, j;13

14 scanf("%d", &nb_lignes);15 scanf("%d", &nb_col);16 M = (int**)malloc(nb_lignes * sizeof(int*));17 for (i=0; i<nb_lignes; i++)18 M[i] = (int*)malloc(nb_col * sizeof(int));19 for (i=0; i<nb_lignes; i++)20 {21 for (j=0; j<nb_col; j++)22 scanf("%d",&M[i][j]);23 }24 return(M);25 }26

27 void affiche(int **M, unsigned int nb_lignes, unsigned int nb_col)28 {29 int i, j;30 if (M == NULL)31 {32 printf("\n Erreur: la matrice a afficher est egale a NULL\n");33 return;34 }35 for (i=0; i < nb_lignes; i++)36 {37 for (j=0; j < nb_col; j++)38 printf("%2d\t",M[i][j]);39 printf("\n");40 }41 return;42 }43

44

45 int **produit(int **A, int **B, unsigned int nb_lignes1, unsigned int nb_col1, unsigned int nb_lignes2, unsigned int nb_col2)

46 {47 int **P;48 int i, j, k;49

50 if (nb_col1 != nb_lignes2)51 {52 printf("\n Impossible d’effectuer le produit : dimensions incompatibles\n");53 return(NULL);54 }55 P = (int**)malloc(nb_lignes1 * sizeof(int*));56 for (i=0; i<nb_lignes1; i++)57 P[i] = (int*)calloc(nb_col2, sizeof(int));58 /* calcul de P[i][j] */

59 for (i=0; i < nb_lignes1; i++)60 {61 for (j=0; j < nb_col2; j++)62 {63 for (k=0; k < nb_lignes2; k++)64 P[i][j] += A[i][k] * B[k][j];65 }66 }67 return(P);68 }69

70

71 int main()72 {73 int **A, **B, **P;74 unsigned int nb_lignesA, nb_lignesB, nb_colA, nb_colB;75 76 A = lecture_matrice(nb_lignesA, nb_colA);77 printf("\n Affichage de A:\n");78 affiche(A, nb_lignesA, nb_colA);79 B = lecture_matrice(nb_lignesB, nb_colB);80 printf("\n Affichage de B:\n");81 affiche(B, nb_lignesB, nb_colB);82 P = produit(A, B, nb_lignesA, nb_colA, nb_lignesB, nb_colB);83 printf("\n Affichage du produit de A par B:\n");84 affiche(P, nb_lignesA, nb_colB);85 return(EXIT_SUCCESS);86 }87

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