Save array in memory into file : Memory Save « Memory « C / ANSI-C

1. C / ANSI-C
2. Memory
3. Memory Save

Save array in memory into file

#include <stdio.h>
#include <stdlib.h>

int main(void)
{

  int i;
  double *p;
  FILE *fp;

  /* get memory */
  p = malloc(10 * sizeof(double));
  if(!p) {
    printf("Allocation Error");
    exit(1);
  }

  /* generate 10 random numbers */
  for(i = 0; i < 10; i++)
    p[i] = (double) rand();

  if((fp = fopen("my.txt", "wb")) == NULL) {
    printf("Cannot open file.\n");
    exit(1);
  }

  /* write the entire array in one step */
  if( fwrite(p, 10*sizeof(double), 1, fp) != 1) {
    printf("Write Error.\n");
    exit(1);
  }
  fclose(fp);

  free(p); /* free memory */

  /* get memory again */
  p = malloc(10 * sizeof(double));
  if(!p) {
    printf("Allocation Error");
    exit(1);
  }

  if((fp = fopen("my.txt", "rb"))==NULL) {
    printf("Cannot open file.\n");
    exit(1);
  }
  /* read the entire array in one step */
  if(fread(p, 10 * sizeof( double ), 1, fp) != 1) {
    printf( " Read Error.\n " );
    exit( 1 );
  }
  fclose( fp );

  /* display the array */
  for(i = 0; i < 10; i++) 
      printf("%f ", p[ i ]);
  free(p);

  return 0;
}


           
       

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