CareerCup

My answer :

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

#define BUF_SIZE 100

void mycp(const char *SourceFile, const char *DestFile )
{
	int SFD; // source file Descriptor
	int DFD; // Destination File Descriptor
	int rb ; // read bytes
	int wb ; // write bytes
	char buf[BUF_SIZE];// Buffer to read and write

	if( (SFD = open(SourceFile, O_RDONLY )) == -1 )
	{
		perror("open() : ");
		exit(0);
	} 	
        if( (DFD = open(DestFile, O_WRONLY | O_CREAT )) == -1 )
        {
                perror("open() : ");
                exit(0);
        }       

	while( ( rb = read( SFD, buf, BUF_SIZE )) > 0 )
	{
		wb = write(DFD, buf, rb );
		if( rb != wb )
		{
			perror(" write ");
			exit(0);
		}
	}

      Close(SFD);
      Close(DFD);
}
int main(int argc, char **argv)
{
	if( argc < 3)
	{
		printf("\n Usage: $mycp Sourcefile Destfile ");
		exit(0);
	}

	mycp( argv[1], argv[2] );

	return 0;
}

$ Mycp SourceFile DestFile

Is there any other better way ?

missed to close file descriptors.

Close(SFD);
Close(DFD);