Write character to stream.
  Writes character to the current position in the specified stream and increase the file pointer to point to next character.
  This routine is normally implemented as a macro with the same result as fputc.

Parameters.

character

Character to be written. The function casts the int parameter to its unsigned char equivalent before writing it.

stream

pointer to an open file.

Return Value.
  If there are no errors the written character is returned. If an error occurs, EOF is returned.

Portability.
  Defined in ANSI-C. Compatible with K&R.

Example.

/* putc example: alphabet writer */
#include <stdio.h>

int main ()
{
  FILE * pFile;
  char c;

  pFile=fopen("alphabet.txt","wt")
  for (c = 'A' ; c <= 'Z' ; c++) {
    putc (n , pFile);
    }
  fclose (pFile);
  return 0;
}

See also.
  fgetc, fputc, fwrite, getchar, putchar