#include
#include
#include
void main()
{
float S;
int a[100], b[100];
int i,n,d,t,maxx,maxy;
printf("Nhap n:");
scanf("%d",&n);
for(i=1;i<=n;i++)
{
printf("M%d(a[%d];b[%d])",i,i,i);
scanf("%d%d",&a[i],&b[i]);
}
/*Tinh do dai duong gap khuc */
S=sqrt((a[n]-a[1])*(a[n]-a[1])+(b[n]-b[1])*(b[n]-b[1]));
for(i-2;i<=n;i++)
S=S+sqrt((a[n]-a[1])*(a[n]-a[1])+(b[n]-b[1])*(b[n]-b[1]));
printf("Do dai duong gap khuc=%f",S);
/*Dem so diem thuoc goc phan tu thu nhat va thu tu */
d=0; t-0;
for(i=1;i<=n;i++)
{
if(a[i]>0&&b[i]>0)
d++;
if(a[i]>0&&b[i]<0)
t++;
}
printf("So diem thuoc goc phan tu thu nhat =%d",d);
printf("So diem thuoc goc phan tu thu tu =%d",t);
/*Tim hinh chu nhat co cac canh song song voi truc toa do chua n diem tren */
maxx=abs a[i];
maxy=abs b[i];
for(i=2;i<=n;i++)
{
if(maxx
maxx=abs a[i];
if(maxy
maxy=abs b[i];
}
printf("Hinh chu nhat co cac canh song song voi truc toa do la :%
CAch 2
#include
#include
#include
void main()
{
double S,dmax,e,s;
int a[100], b[100];
int i,n,d,t,maxx,maxy;
printf("Nhap n:");
scanf("%d",&n);
for(i=1;i<=n;i++)
{
printf("M%d(a[%d];b[%d])",i,i,i);
scanf("%d%d",&a[i],&b[i]);
}
/*Tinh do dai duong gap khuc */
S=sqrt((a[n]-a[1])*(a[n]-a[1])+(b[n]-b[1])*(b[n]-b[1]));
for(i=2;i<=n;i++)
S=S+sqrt((a[n]-a[1])*(a[n]-a[1])+(b[n]-b[1])*(b[n]-b[1]));
printf("\nDo dai duong gap khuc=%f",S);
/*Dem so diem thuoc goc phan tu thu nhat va thu tu */
d=0; t=0;
for(i=1;i<=n;i++)
{
if(a[i]>0&&b[i]>0)
d++;
if(a[i]>0&&b[i]<0)
t++;
}
printf("\nSo diem thuoc goc phan tu thu nhat =%d",d);
printf("\nSo diem thuoc goc phan tu thu tu =%d",t);
/*Tim hinh chu nhat co cac canh song song voi truc toa do chua n diem tren */
maxx=abs (a[1]);
maxy=abs (b[1]);
for(i=1;i<=n;i++)
{
if(maxx
maxx=abs (a[i]);
if(maxy
maxy=abs (b[i]);
}
s=maxx*maxy;
printf("\nDien tich hinh chu nhat co cac canh song song voi truc toa do la :%f",s);
dmax=e=0;
for(i=1;i<=n;i++)
{
e=sqrt(a[i]*a[i]+b[i]*b[i]);
if(dmax
dmax=e;
}
printf("\nDuong tron tam O, chua cac diem co ban kinh nho nhat la:%f",dmax);
getch();
}
