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

int main( void ){
  char file[] = "tmp.bin";

  printf("Open %s\n", file);
  FILE *fp = fopen( file, "wb" );
  if( fp == NULL ){
    fputs("Failed to open the file.\n", stderr);
    exit( EXIT_FAILURE );
  }

  int n = 3;
  double x = 2.5;
  char str[] = "hoge";

  printf("Write: n = %d, x = %f, str = %s\n", n, x, str);
  if( fwrite( &n, sizeof(n), 1, fp ) < 1 ){
    fputs( "Failed to write data.\n", stderr );
    exit( EXIT_FAILURE );
  }
  if( fwrite( &x, sizeof(x), 1, fp ) < 1 ){
    fputs( "Failed to write data.\n", stderr );
    exit( EXIT_FAILURE );
  }
  if( fwrite( str, sizeof(str[0]), sizeof(str), fp ) < sizeof(str) ){
    fputs( "Failed to write data.\n", stderr );
    exit( EXIT_FAILURE );
  }

  printf("Close the file.\n");
  if( fclose(fp) == EOF ){
    fputs( "Failed to close the file.\n", stderr );
    exit( EXIT_FAILURE );
  }

  return 0;
}