编辑代码

#include<stdio.h>
union exam
 {  int k;
    char c;
}
main()
 {  union exam a;
     scanf("%d",&a.k);
     printf("%d,%c\n",a.k,a.c);
     scanf("%c",&a.c);
     printf("%d,%c\n",a.k,a.c);
}