tst_ungetchar.c

来自「这是《Keil Cx51 V7.0单片机高级语言编程与uVision2应用实践》」· C语言 代码 · 共 9 行

#include <stdio.h>
void tst_ungetchar (void) {
   char k;
   while (isdigit (k = getchar ())) {
          /* stay in the loop as long as k is a digit */
   }
   ungetchar (k);
 }