WRITE A PROGRAM to copy files using system calls.

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#include<iostream>
#include<fcntl.h>
#include<stdlib.h>
#include<unistd.h>
using namespace std;

int main(int argc, char *argv[])
{
    if(argc!=3)
    {
        cout<<"File name not found "<<endl;
        exit(1);
    }

    int fd1=open(argv[1],0);
    if(fd1<0)
    {
        cout<<"Error in opening file "<<argv[1]<<endl;
        exit(1);
    }

    int fd2=creat(argv[2], 0666);
    if(fd2<0)
    {
        cout<<"Error in creating file "<<argv[2]<<endl;
        exit(1);
    }

    char buf[500];
    int count;
    while(count=read(fd1,buf,sizeof(buf)))
    {
        write(fd2,buf,count);
    }

    close(fd1);
    close(fd2);
    return 0;
}

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