[C++知识库]C语言实现复数的加减乘除

设两个复数分别为(a+bi)和(c+di)，则它们加减乘除后的结果如下：
(a+bi)+(c+di)=(a+c)+(b+d)i,
(a+bi)-(c+di)=(a-c)+(b-d)i,
(a+bi)*(c+di)=(ac-bd)+(ad+bc)i,
(a+bi)/(c+di)=(ac+bd)/(c2+d2) +((bc-ad)/(c2+d2))i

代码实现：

#include<stdio.h>
#include<math.h>
typedef struct{
	float realpart;
	float imagpart;
}complex;
void assign(complex *A,float real,float imag) //赋值 
{
	A->realpart = real;
	A->imagpart = imag;
}

void add(complex *A,complex *B,complex *C) //相加 
{
	C->realpart = A->realpart + B->realpart;
	C->imagpart = A->imagpart + B->imagpart;
}

void minus(complex *A,complex *B,complex *D) //相减 
{
	D->realpart = A->realpart - B->realpart;
	D->imagpart = A->imagpart - B->imagpart;
}

void multiply(complex *A,complex *B,complex *F) //相乘 
{
	F->realpart = (A->realpart * B->realpart) - (A->imagpart * B->imagpart);
	F->imagpart = (A->realpart * B->imagpart) + (A->imagpart * B->realpart);
}

void divide(complex *A,complex *B,complex *G) //相除 
{
	G->realpart = ((A->realpart * B->realpart) + (A->imagpart * B->imagpart))
	              / ((B->realpart * B->realpart) + (B->imagpart * B->imagpart));
	G->imagpart = ((A->imagpart * B->realpart) - (A->realpart * B->imagpart))
	              / ((B->realpart * B->realpart) + (B->imagpart * B->imagpart));
}

void Getreal(complex *a) //输出操作后的实部 
{
	printf("realpart = %.2f\n",a->realpart);
}

void Getimag(complex *a) //输出操作后的虚部 
{
	printf("imagpart = %.2f\n",a->imagpart);
}
int main()
{
	float realpart,imagpart;
	complex a1,a2,a3,a4,a5,a6;
	assign(&a1,8.0,6.0); //赋值 
	assign(&a2,4.0,3.0); //赋值 
	add(&a1,&a2,&a3); //相加 
	minus(&a1,&a2,&a4); //相减 
	multiply(&a1,&a2,&a5); //相乘 
	divide(&a1,&a2,&a6); //相除
	printf("第一个复数为:%0.2f+%0.2fi\n",a1.realpart,a1.imagpart);
	printf("第一个复数的实部和虚部分别为:\n");
	Getreal(&a1); 
	Getimag(&a1); 
	printf("第二个复数为:%0.2f+%0.2fi\n",a2.realpart,a2.imagpart);
	printf("第二个复数的实部和虚部分别为:\n");
	Getreal(&a2); 
	Getimag(&a2); 
	printf("相加后复数为:%0.2f+%0.2fi\n",a3.realpart,a3.imagpart);
	printf("两个复数相加后的实部和虚部分别为:\n");
	Getreal(&a3); 
	Getimag(&a3); 
	printf("相减后复数为:%0.2f+%0.2fi\n",a4.realpart,a4.imagpart);
	printf("两个复数相减后的实部和虚部分别为:\n");
	Getreal(&a4); 
	Getimag(&a4); 
	printf("相乘后复数为:%0.2f+%0.2fi\n",a5.realpart,a5.imagpart);
	printf("两个复数相乘后的实部和虚部分别为:\n");
	Getreal(&a5); 
	Getimag(&a5); 
	printf("相除后复数为:%0.2f+%0.2fi\n",a6.realpart,a6.imagpart);
	printf("两个复数相除后的实部和虚部分别为:\n");
	Getreal(&a6); 
	Getimag(&a6);
	return 0;
}