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Create a file, write content and read the content

Create a file, write content and read the content

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

int main(void)
{
  char str[80] = "Superman\n";
  FILE *fp;
  char *p;
  int i;

  /* open myfile.txt for output */
  if((fp = fopen("myfile.txt", "w"))==NULL) {
    printf("Cannot open file.\n");
    exit(1);
  }

  /* write str to disk */
  p = str;
  while(*p) {
    if(fputc(*p, fp)==EOF) {
      printf("Error writing file.\n");
      exit(1);
    }
    p++;
  }
  fclose(fp);

  /* open myfile.txt for input */
  if((fp = fopen("myfile.txt", "r"))==NULL) {
    printf("Cannot open file.\n");
    exit(1);
  }

  /* read back the file */
  for(;;) {
     i = fgetc(fp);
     if(i == EOF) break;
     putchar(i);
  }
  fclose(fp);

  return 0;
}

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