如何使用C语言将内容打印到文件中？

while ((ch = getchar( ))!=EOF) {//after enter data press cntrl+Z to terminate
   fputc(ch, fp);
}

#include<stdio.h>
int main( ){
   FILE *fp;
   char ch;
   int n,i=0;
   fp = fopen ("reverse.txt", "w");
   printf ("enter text press ctrl+z of the end");
   while ((ch = getchar( ))!=EOF){
      fputc(ch, fp);
   }
   n = ftell(fp);
   printf ( "No. of characters entered = %d</p><p>", n);
   rewind (fp);
   n = ftell (fp);
   printf ("fp value after rewind = %d</p><p>",n);
   fclose (fp);
   fp = fopen ("reverse.txt", "r");
   fseek(fp,0,SEEK_END);
   n = ftell(fp);
   printf ("reversed content is</p><p>");
   while(i<n){
      i++;
      fseek(fp,-i,SEEK_END);
      printf("%c",fgetc(fp));
   }
   fclose (fp);
   return 0;
}

enter text press ctrl+z of the end
TutorialsPoint
^Z
No. of characters entered = 18
fp value after rewind = 0
reversed content is
tnioPslairotuT