c语言练习题 3-2 计算矩形面积

#include<stdio.h>
int max(int a,int b)
{
if(a>b)
{
return a;
}
else
{
return b;
}
}

int min(int a,int b)
{
if(a<b)
{
return a;
}
else
{
return b;
}
}

int main()
{
int Ax1,Ay1,Ax2,Ay2;
int Bx1,By1,Bx2,By2;
int a,b,right,left,top,buttom;
scanf("%d %d %d %d",&Ax1,&Ay1,&Ax2,&Ay2);
scanf("%d %d %d %d",&Bx1,&By1,&Bx2,&By2);

a=max(Ax1,Ax2);
b=max(Bx1,Bx2);
right=min(a,b);

a=min(Ax1,Ax2);
b=min(Bx1,Bx2);
left=max(a,b);

a=max(Ay1,Ay2);
b=max(By1,By2);
top=min(a,b);

a=min(Ay1,Ay2);
b=min(By1,By2);
buttom=max(a,b);

if(((right-left)<=0)||((top-buttom)<=0))
{
printf("0");
}
else
{
printf("%d\n",(right-left)*(top-buttom));

}
return 0;
}