已知两个复数5.6+i4.8和3.4+i1.2,求它们的和与积。描述复数运算使用下述结构模式：

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已知两个复数5.6+i4.8和3.4+i1.2,求它们的和与积。描述复数运算使用下述结构模式：

struct complex

{ double re;

double im;

} 参考程序：

struct complex

{ double re,im;

}; #include <iostream.h>

void main()

{ struct complex x={5.6,4.8},y={3.4,1.2};

struct complex,struct complex z1,z2;

add (struct complex,struct comlex);

mulitiply (struct complex,struct complex);

z1=add(x,y);

z2=mulitiply(x,y);

　 count<<'("x.re<<"+i"<<x.im<<")+("<<y.re<<"+I"<<y.rm<<")=";

count<<'("x.re<<"+i"<<x.im<<")<<endl;

　 count<<'("x.re<<"+i"<<x.im<<")*("<<y.re<<"+I"<<y.rm<<")=";

count<<'("x.re<<"+i"<<x.im<<")<<endl;

} struct complex add(struct complex x,struct complex y)

{ struct complex z;

z.re=x.re+y.re;

z.rm=x.rm+y.rm;

retrun z;

} struct complex mulitiply(struct complex x, struct complex y)

{ struct complex z;

z.re=x.re*y.re+x.im*y.im:

z.rm=x.re*y.im+x.im*y.re;

return z;

,求它们的和与积