/* Questo programma contiene qualche esempio di scrittura e lettura su/da file */


#include <stdio.h>
#include <stdlib.h>
#define LEN 10

main (){

  FILE *fpoint;
  int i, k;

  double x,data[LEN];

  if((fpoint = fopen("Random.dat","w")) == NULL){
       printf("Non e' stato possibile aprire il file \n");
       exit(EXIT_FAILURE);
	 }

     for(i=1;i<LEN;i++){
       x=(double)rand()/RAND_MAX;
       fprintf(fpoint, "%d %f\n",i,x);
     }

     fclose(fpoint);

     fpoint=fopen("Random.dat","r+");

     for(i=1;i<=LEN;i++){
       fscanf(fpoint, "%d %lf",&k,&x);
       *(data+LEN-k)=x;
     }

     fprintf(fpoint, "\n INVERSIONE \n");
     for(i=2;i<=LEN;i++){
       fprintf(fpoint,"%d %f\n",i-1,*(data+i-1));
     }
     fclose(fpoint);


}