题解 | #KiKi设计类继承#

#include <stdio.h> 

typedef struct all{
    float x;
    float y;
    float r;
    float c;
    float (*Circles_GetArea)(float r);  //圆面积 
    float (*Squares_GetArea)(float c);  //正方形面积 
    float (*Rectangles_GetArea)(float x,float y);  //矩形面积 
}shape,*linkshape;

float Circles(float r)
{
    float area = r*r*3.14;
    return area;
}
float Squares(float c)
{
    float area = c*c;
    return area;
}
float Rectangles(float x,float y)
{
    float area = x*y;
    return area;
}

int main()
{

    shape Area;
    scanf("%f%f",&Area.x,&Area.y);
    scanf("%f",&Area.r);
    scanf("%f",&Area.c);

    Area.Circles_GetArea = Circles;
    Area.Squares_GetArea = Squares;
    Area.Rectangles_GetArea = Rectangles;
    printf("%g\n%g\n%g\n",Area.Rectangles_GetArea(Area.x,Area.y),Area.Circles_GetArea(Area.r),Area.Squares_GetArea(Area.c));

    return 0;
}