Although we can handle most I/O routines with getc and putc , there are file versions of fgets, fputs, fprintf and fscanf . The syntax is
 
    fgets(stringname,n,filename);
 
This reads n-1 characters form the filename into the stringname variable 
  
    fputs(stringname,filename);
 
This writes the contents of the stringname to the filename channel
 
    fscanf(filename,"format",&variables);
 
This is identical to scanf except that the data is read from the filename
 
    fprintf(filename,"format",variables);
 
This is a file write function to store raw binary data
    fwrite(filename,"format",variables);
 
This is a file read function to read raw binary data
 
    fread(filename,"format",variables);

These I/O functions are actually the original I/O functions and printf etc are a simplified sub set of I/O. The VDU and keyboard defined as  streams namely stdout and stdin. Therefore within C we have re-defined the following function i.e

    fprintf(stdout,"format",variables);
 
to
 
    printf("format",variables);
 
Likewise we have 
 
  scanf subset of fscanf    File is stdin
  getchar subset of getc    File is stdin
  putchar subset of putc    File is  stdout
  puts subset of fputs      File is stdout
  gets subset of fgets      File is stdin