刚学编程，想写个能运算四则运算的程序，为啥提示我出现严重错误啊
#include<stdio.h>
int main() {
double a, b, c, d,x,y,t;
char op,tmp;
printf("\n请输入第一个复数的实部和虚部：");
scanf_s("%lf %lf", &a, &b);
printf("\n请输入运算符：");
scanf_s("%c %c",&tmp,&op );
printf("\n请输入第二个复数的实部和虚部：");
scanf_s("%lf %lf", &c, &d);
switch (op) {
case'+':
x = a + b;
y = c + d;
break;
case'-':
x = a - b;
y = c - d;
break;
case'*':
x = a * c - b * d;
y = b * c + a * d;
break;
case'/':
t = c * c - d * d;
if (t==0) {
printf("分母不为零");
return 0;
}
else
x = (a * c + b * d) / (c * c - d * d);
y = (b * c - a * d) / (c * c - d * d);
break;
default:
printf("invalidation operator\n");
return 0;
}
printf("复数的运算的结果为：%lf+%lfi",x,y);
return 0;
}
