题解 | #KiKi设计类继承#

#include <stdio.h>
#define PI 3.14
int rectangle(int length,int width)
{
    return length*width;
}

float circle(int r)
{
    return PI*r*r;
}

int square(int sizeLength)
{
    return sizeLength*sizeLength;
}

int main() {
    int length,width,r,sizeLength;

    scanf("%d %d\n%d\n%d",&length,&width,&r,&sizeLength);
    //求矩形面积
    printf("%d\n",rectangle(length,width));
    //求圆的面积
    printf("%g\n",circle(r));
    //求正方形面积
    printf("%d\n",square(sizeLength));

    return 0;
}