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//2-5
#include<iostream>
#include<string>
#include<math.h>
using namespace std;
class Triangle
{ int a,b,c;public: double Area()
{
double s=(a+b+c)/2;
return sqrt(s*(s-a)*(s-b)*(s-c)); };
int Perimeter(){
return a+b+c;
}
void Input(){
cin>>a>>b>>c; }};
void main()
{ Triangle t1;
t1.Input();
cout<<t1.Area()<<" "<<t1.Perimeter();
}
//2-3
#include<iostream.h>
inline int max(int a,int b)
{
if(a>b)return a;
else return b;}
inline int max(int a,int b,int c)
{
return max(a,max(b,c));
}
void main()
{
int x=21,y=15,z=22,d;
d=max(x,max(y,z));
cout<<d;
}
//2-4
#include<iostream.h>
int overload(int n);
char overload(char n);
void main()
{
int n;
char s;
cout<<"
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5";
cin>>n;