C/stdio.h/fputc

    
//Header file:     #include <stdio.h>  
//Declaration:     int fputc(int ch, FILE *stream); 
//Return:          returns the value of the character written on success or 
                   EOF on failure. 
  
  #include <stdio.h>
  #include <stdlib.h>
  int main(void)
  {
    FILE *fp;
    if((fp=fopen("test", "wb"))==NULL) {
      printf("Cannot open file.\n");
      exit(1);
    }
    char *str = "www.java2s.com";
    while(*str){
         if(!ferror(fp)) {
              fputc(*str++, fp);
         }
    }
 
    fclose(fp);
  }