Learning C 6 Subprograms

I jus rewrote and corrected the code of the app from LESSON #4 because on run it had an error: "Segmentation fault (core dumped)". But I wanted to complicate it and I added a new function that transfor an array in a matrix and I worked with subprograms because I think its more clearly and nice. So, the same example:

Transformation from matrix to array:

1 2 3 4

5 6 7 8= A[3][4] where A.lin=3 and A.col=4 so => V.elem=3*4=12

9 0 1 2

So 

1 2 3 4 5 6 7 8 9 0 1 2= V.vector[12]

The formula is:

k=A.col*i+j 

Transformation from array to matrix:

1 2 3 4 5 6 7 8 9 0 1 2= V.vector[12]=> V.elem=12.=>

1 2 3 4

5 6 7 8=A[3][4]

9 0 1 2

The formulas are:

i=k/A.col and j=k%A.col

And the code is:

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def.c

typedef struct{

double **matr;

int lin;

int col;

}Matrice;

typedef struct{

double *vector;

int elem;

}Array;

int i,j,k;

Matrice A,B; Array V;

-----------------------------------------------------------------------------------------------

functii.c

// citire matrice

void citire_matr(Matrice A){

     for(i=0;i<A.lin;i++)

                    { for(j=0;j<A.col;j++)

                                     scanf("%lf",&A.matr[i][j]);

     }

}

//afisare matrice

void afisare_matrice(Matrice A){

     for(i=0;i<A.lin;i++)

                     {for(j=0;j<A.col;j++)

                                     printf("%lf ",A.matr[i][j]);

                     printf("
");

                     }

     printf("
");

     }

//afisare vector

void afisare_vector(Array V){

     for(k=0;k<V.elem;k++)

                       printf("%lf ",V.vector[k]);

     printf("
");

     }

//transformare matrice->vector

void matr_vector(Matrice A, Array V){

      for(i=0;i<A.lin;i++)

                     for(j=0;j<A.col;j++)

                                     V.vector[A.col*i+j]=A.matr[i][j];

     }

//transformare vector->matrice

void vectortomatr(Matrice B, Array V){

    i=j=k=0;

    while(k<V.elem){

    B.matr[k/B.col][k%B.col]=V.vector[k];

    i++;j++;k++;

    }

}

-----------------------------------------------------------------------------------------------

main.c

#include<stdio.h>

#include<stdlib.h>

#include "def.c"

#include "functii.c"

int main(){

printf("Nr de linii si numarul de coloane este:");scanf("%d %d",&A.lin,&A.col);

V.elem=A.col*A.lin;

B.lin=A.lin; B.col=A.col;

A.matr=(double **) malloc(A.lin*sizeof(double*));

B.matr=(double **) malloc(B.lin*sizeof(double*));

V.vector=(double *)malloc(V.elem*sizeof(double));

for(i=0;i<A.lin;i++) // aloca memorie pt elem din linia i

    if((A.matr[i]=(double *)malloc(A.col*sizeof(double)))==NULL || (B.matr[i]=(double *)malloc(B.col*sizeof(double)))==NULL)

      {

      printf("
 memorie insuficienta");

      exit(1) ;

      }

else 

if(V.vector==NULL)

{

      printf("
 memorie insuficienta");

      exit(1) ;

      }

citire_matr(A);

printf("Afisare matrice:
");

afisare_matrice(A);

matr_vector(A,V);

printf("Afisare vector:
");

afisare_vector(V);

vectortomatr(B,V);

printf("Afisare matrice:
");

afisare_matrice(B);

free(A.matr);

free(B.matr);

free(V.vector);

system("pause");

return 0;

}

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