#include<iostream>
#include<conio.h>
#include<stdio.h>
#include<math.h>
using namespace std;
// bien toan cuc
int n;
float x,y,z;
// dinh nghia cac ham
void Nhap();
long S1(int );
int TestTamGiac(float, float, float);
void TinhCV_DT(float, float,float);
float S2(float , float , float ,int);
void InSoNT(int);
// ham chinh
int main(){
// goi ham Nhap
// cau 1
Nhap();
//cau 2
cout<<"\n S1= "<<S1(n);
// cau 3
if(TestTamGiac(x,y,z)==1)
cout<<"\n 3 so "<<x<<", "<<y<<", "<<z <<" la 3 canh cua tam giac";
else
cout<<"\n 3 so "<<x<<", "<<y<<", "<<z <<" khong phai 3 canh cua tam giac";
// cau 4
TinhCV_DT(x,y,z);
// cau 5
cout<<"\n S2 = "<<S2(x,y,z,n);
// cau 6
InSoNT(n);
}
/* **************************** */ //khai bao cac ham
// Nhap x, y, z, n
void Nhap(){
// nhap n
do{
cout<<"\n n ="; cin>>n;
if(n<3||n>2000)
cout<<"\n Nhap lai n! ";
}while(n<3||n>2000);
// nhap x,y,z
cout<<"\n x ="; cin>>x;
cout<<"\n y ="; cin>>y;
do{
cout<<"\n z ="; cin>>z;
if(z==0)
cout<<"\n Nhap lai z! ";
}while(z==0);
}
// ham tinh giai thua
long TinhGT(int a){
long gt=1;
for(int i=1;i<=a;i++)
gt*=i;
return gt;
}
// ham tinh s1
long S1(int n){
long s=0;
for (int i=2;i<=2*n;i=i+2)
s=s+TinhGT(i);
return s;
}
// kiem tra tam giac
int TestTamGiac(float x, float y, float z){
int test=0;
if(x>0&&y>0&&z>0&&x+y>z&&x+z>y&&y+z>x)
test =1;
return test;
}
// tinh chu vi, dien tich
void TinhCV_DT(float x, float y,float z){
float c, s;
if(TestTamGiac(x,y,z) ==0)
cout<<"\n Khong the tinh duoc chu vi, dien tich vi x,y,z khong phai 3 canh tam giac";
else{
c=x+y+z;
float p=c/2;
s=sqrt(p*(p-x)*(p-y)*(p-z));
cout<<"\n Chu vi = "<<c;
cout<<"\n Dien tich = "<<s;
}
}
// ham tinh s2
float S2(float x, float y, float z,int n){
float t=0;
int i =1;
while(i<=n){
t=t+(pow(x,i)+i*y)/(i*z);
i++;
}
return t;
}
// kiem tra so nguyen to
int TestSNT(int a){
int test=1;
if(a==1||a==2||a==3||a==5||a==7)
return test;
for(int i=2;i<a;i++)
if(a%i==0) test=0;
return test;
}
// In so nguyen to
void InSoNT(int n){
cout<<"\n In so nguyen to: ";
if(n<7)
cout<<"\n Khong ton tai so nguyen to thoa man dieu kien ";
else
for(int i=7;i<n;i++)
if(TestSNT(i)==1)
cout<<i<<", ";
}