block_char

//copy_char

#include<stdio.h>

#include<unistd.h>

int main(){

int c;

FILE *in,*out;

in=fopen("file.in","r");

out=fopen("file.out","w");

while((c=fgetc(in)) != EOF)

fputc(c,out);

return 0;

}

================================================================================================================

#include<unistd.h>

#include<sys/types.h>

#include<sys/stat.h>

#include<fcntl.h>

#include<stdio.h>

#include<stdlib.h>

int main(){

char c;

int in,out;

in = open("file.in",O_RDONLY);

out = open("file.out",O_WRONLY|O_CREAT,S_IRUSR|S_IWUSR);

while(read(in,&c,1)==1)

write(out,&c,1);

exit(EXIT_SUCCESS);

}