复数的四则运算

#include<stdio.h>
#include<stdlib.h>
void add_state(float a, float b, float x, float y)
{
float m = a + x;
float n = b + y;
if (n > 0)
printf("%f+%fi\n", m, n);
else
printf("%f%fi\n", m, n);
}
void sub_state(float a, float b, float x, float y)
{
float m = a - x;
float n = b - y;
if (n > 0)
printf("%f-%fi\n", m, n);
else
printf("%f%fi\n", m, n);
}
void mul_state(float a, float b, float x, float y)
{
float m = a*x - b*y;
float n = a*y + b*x;
if (n > 0)
printf("%f+%fi\n", m, n);
else
printf("%f%fi\n", m, n);

}
void div_state(float a, float b, float x, float y)
{
float m = (a*x + b*y) / (x*x + y*y);
float n = (-a*y + b*x) / (x*x + y*y);
if (n > 0)
printf("%f+%fi\n", m, n);
else
printf("%f%fi\n", m, n);
}
struct  pluar
{
float real;
float imag;
char i;
};

#define _CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>
#include<stdlib.h>
#include"windly.h"
int main()
{
printf("**************两个复数之间的运算**************\n");
printf("请按照标准形式 a+bi 输入复数，其中a,b不可缺省\n");
struct pluar num1 = { 0 };
struct pluar num2 = { 0 };
char sym[2];
scanf("%f%f%s", &num1.real, &num1.imag, &num1.i);
scanf("%s",sym);
scanf("%f%f%s", &num2.real, &num2.imag, &num2.i);
switch (sym[0])
{
case '+':
add_state(num1.real, num1.imag, num2.real, num2.imag);
break;
case '-':
sub_state(num1.real, num1.imag, num2.real, num2.imag);
break;
case '*':
mul_state(num1.real, num1.imag, num2.real, num2.imag);
break;
case '/':
div_state(num1.real, num1.imag, num2.real, num2.imag);
break;
default:
printf("NULL");
break;
}
system("pause");
return 0;
}