C - 将密钥从 kbhit 写入文件会导致程序崩溃

Question

Writing the key value to the file is making the program crash. I know this because I substituted the key value for a normal String and the program worked fine. Why is the key value making the program crash?

#include <stdio.h>
#include <conio.h>

int main() {

  FILE *fp;
  fp = fopen("C:\\Users\\Francisco\\Documents\\C programs\\log.txt", "w");


  int key;

  while(1) {

    if(_kbhit()) {

     key = _getch();

      fprintf(fp, (const char*) key);

    }

  }

  fclose(fp);

  return 0;

}

Answer 1

  fprintf(fp, (const char*) key);

应该

  fprintf(fp,"%c ",key);