Write some non-character data to a disk file and read it back : File Write « File « C / ANSI-C






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

Write some non-character data to a disk file and read it back

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

int main(void)
{
  FILE *fp;
  double d = 1.23;
  int i = 10;
  long l = 13333023L;

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

  fwrite(&d, sizeof(double), 1, fp);
  fwrite(&i, sizeof(int), 1, fp);
  fwrite(&l, sizeof(long), 1, fp);

  rewind(fp);

  fread(&d, sizeof(double), 1, fp);
  fread(&i, sizeof(int), 1, fp);
  fread(&l, sizeof(long), 1, fp);

  printf("%f %d %ld", d, i, l);

  fclose(fp);

  return 0;
}








Related examples in the same category

1.Write out file
2.Writing strings to a file
3.Writing names and phone numbers to a file
4.Save text content into a file
5.Writing a file a character at a time
6.Use fprintf to save
7.Read and write array into file
8.Redirect the printf to file
9.write non string content
10.Save string into file: fputs
11. Write character to stream: how to use putc
12. Write character to stdout: how to use putchar
13. Write character to stream: how to use fputc
14. Write character to stdout: how to use fputchar
15. Write string to a stream: how to use fputs
16. Write a block of data to a stream: how to use fwrite
17.Save and write different type of value into file
18.Save and read string into a file
19.Write and read the entire array in one step