Programming

#include<stdio.h>
#include<stdlib.h>
#include<unistd.h>
#include<sys/types.h>
#include<sys/stat.h>
#include<errno.h>
#include<fcntl.h>
#include<ctime>
#include<cmath>
#include<iostream>
using namespace std;
#define FILE_MODE  (S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH)
#define _PARAM 5
#define _RAND_RANGE 100
#define DOWNLOADER_FIFO "/tmp/fifo.0"

int main(int argc, char **argv)
{

     int fd, value = 19;
   int n;
   char c[10];

   if( (fd = open("file.txt", O_WRONLY | O_CREAT, FILE_MODE) ) < 0 ){
        perror("file creation failed..\n");
          return false;
   }      sprintf(c, "%d", value);
          if((n = write(fd, c, sizeof c)) < 0){
                  perror("\n");
                     return false;}
   close(fd);

  return 0;
}