Save and read string into a file : File Write « File « C / ANSI-C






  1. C / ANSI-C
  2. File
  3. File Write

Save and read string into a file


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

double d[10] = {
  1.2, 1.7, 1.3, 1.9, 0.7,
  1.4, 7.4, 0.0, 1.1, 5.5
};

int main(void)
{
  int i;
  FILE *fp;

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

  for( i = 0; i < 10; i++)
    if(fwrite(&d[i], sizeof( double ), 1, fp) != 1) {
      printf("Write error.\n");
      exit(1);
    }
  fclose(fp);

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

  /* clear the array */
  for(i = 0; i < 10; i++) 
      d[i] = -1.0;

  for(i = 0; i < 10; i++)
    if(fread(&d[i], sizeof(double), 1, fp) != 1) {
      printf("Read error.\n");
      exit(1);
    }
  fclose(fp);

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

  return 0;
}








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