pb 1-5

#include <iostream>

using namespace std;

int main()

{   int pb;
    cout<<"Introduceti numarul problemei:"; cin>>pb;
    switch(pb)
    {
case 5:
    {
    int n, x, i, j, d, cnt;
    cout<<"Cate numere sa se citeasca??"<<endl;  cin>>x;
    for(i=1; i<=x; i++)
    {   cnt=0;
        cout<<"n=";  cin>>n;
        for(j=1; j<=n; j++)
        {
            d=n%j;
            if(d==0 && j%2==0)
               {cout<<j<<endl;
                cnt=cnt+1;
               }

        }
        if(cnt==0)
                cout<<"Nu exista divizori pari"<<endl;

    }
    } break;
    case 4:
        {
            int p, x, n, cnt=0;
            cout<<"Introduceti un nr prim:"; cin>>p;
            while(n!=0)
            {
                cout<<"n="; cin>>n;
                while(n>=p && n%p==0)
                {
                    n=n/p;
                    cnt=cnt+1;

                }


            }
            cout<<"Putere maxima a lui "<<p<<" este: "<<cnt;
        }
        break;
    case 3:
        {
            int a, b, x, y, k;
            float x2, y2;
            cin >> k; // a * b = k // a = x + y // b = x - y
            for (int i = 1; i <= k/2; i++)
            {
                if (k%i == 0)
                {
                    a = i;
                    b = k / a;
                    x = (a + b) / 2;
                    x2 = ((float)a + b) / 2;
                    y = (a - b) / 2;
                    y2 = ((float)a - b) / 2;
                    if (x >= 0 && y >= 0 && x == x2 && y == y2)
                    {
                        cout << a << '*' << b << " = " << k << endl; // a*b = k
                        cout << x << "^2" << " - " << y << "^2" << " = " << k << endl; // x^2 - y^2 = k
                    }
                }
            }
        }
    break;

    }
    return 0;
}