tst_ungetchar.c

来自「KEILC51程序实例和配套硬件目标板,很详细,程序有注释」· 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);
 }