C++ reference: cstdio: fputs

fputs
int fputs (const char * string , FILE * stream);

stdio.h

cplusplus.com

Write string to a stream.
Writes string to the current position of the given stream.
The function begins copying from the address specified (string) until it reaches a null character ('\0') that ends the string. The final null-character is not copied to the stream.

Parameters.

string: Null-terminated string to be written.
stream: pointer to an open file.

Return Value.
On success, a non-negative value is returned.
On error the function returns EOF.

Example.

/* personal diary */
#include <stdio.h>

main ()
{
   FILE * pFile;
   char sentence [256];

   printf ("Enter sentence to append: ");
   fgets (sentence,255,stdin);
   pFile = fopen ("diary.txt","at");
   fputs (sentence,pFile);
   fclose (pFile);
   return 0;
}

This program allows to append a line to a file called diary.txt each time you run it.

See also.
fgets, gets, puts, fprintf, fscanf