#include 
   main ()
       {  double **a;
          int n,m,i;
          scanf("%d %d",&n,&m);
          a=(double **)calloc(m,sizeof(double *));
          for (i=0; i<=m; i++) a[i]="(double" *)calloc(n,sizeof(double)); . . . . . . . . . . . . }