0xC0000005: 写入位置 0x00000000 时发生访问冲突。

怎么回事啊…… 求解……
#include <stdio.h>
void main()
{
int x, y;
char optor;
printf("Please input the expression:\n");
scanf_s("%d%c%d", &x, &optor, &y);
switch (optor)
{
case '+':printf("%d+%d=%d\n", x, y, x + y); break;
case '-':printf("%d-%d=%d\n", x, y, x - y); break;
case '*':printf("%d*%d=%d\n", x, y, x * y); break;
case '/':if (y == 0)
printf("\adivided by 0!\n");
else
printf("%d/%d=%d\n", x, y, x / y);
break;
default:printf("\aInput error!");
}
}
二楼给图