C++练习1

#include <stdio.h>struct complex{int real;int imag;
};//结构体定义：分为实部和虚部struct complex multiply(struct complex x, struct complex y);
//函数声明
int main()
{struct complex product, x, y;scanf("%d%d%d%d", &x.real, &x.imag, &y.real, &y.imag);//输入俩实部和虚部product = multiply(x, y);//使用函数返回复数计算的结果printf("(%d+%di) * (%d+%di) = %d + %di\n", x.real, x.imag, y.real, y.imag, product.real, product.imag);return 0;
}struct complex multiply(struct complex x, struct complex y){struct complex res;res.real=x.real*y.real-x.imag*y.imag;res.imag=x.real*y.imag+x.imag*y.real;return res;
}

#include <stdio.h>
#include <math.h>struct point {double x, y, z;
};void read_point(struct point *p);
double distance(struct point a, struct point b);int main(void)
{struct point p1, p2;read_point(&p1);read_point(&p2);printf("%f\n", distance(p1, p2));return 0;
}void read_point(struct point *p)
{scanf("%lf %lf %lf", &p->x, &p->y, &p->z);
}//  计算并返回平面上两点 a 和 b 之间的欧氏距离
double distance(struct point a, struct point b){double res;res=pow((a.x-b.x),2)+pow((a.y-b.y),2)+pow((a.z-b.z),2);res=sqrt(res);return res;
}