#include <stdio.h>

int main()
{
      int num=0,i,j;
      while(num<1)
      {
          printf("Enter number: ");
          scanf ("%d", &num);
      }
      for(i=0;i<num;++i)
      {
          for(j=0;j<num;++j)
              if(!(i&&j)||(i==num-1)||(j==num-1))
                  printf("%c", '*');
              else printf("%c", ' ');
          printf("\n");
      }
      return 0;
}

#include <stdio.h>

int main()
{
      int num=0,i,j;
      while(num<1)
      {
          printf("Enter number: ");
          scanf ("%d", &num);
      }
      for(i=0;i<num+2;++i)
      {
          for(j=0;j<num;++j)
              if(!(i&&j)||(i==num+1)||(j==num-1))
                  printf("%c", '*');
              else printf("%c", ' ');
          printf("\n");
      }
      return 0;
}

#include <iostream>
struct A
{
      A(): i(1){}
      int i;
};
struct B : A
{
      B(): j(2){}
      int j;
};
int main()
{
      A *p = new B[10];
      A *q = p;
      int total = 0;
      for (int i = 0; i < 10; ++i)
      {
          total += q++->i;
      }
      std::cout << total << std::endl;
      //чему равна переменная total в этом участке кода?
      delete [] p;
}

#include <stdio.h>
class I {
        int i;
public:
        I() : i(1) {printf ("owl\n");}
        I(int a) : i(a) {printf ("cat %d\n",i);}
        I(const I& other) : i(other.i) {printf ("sheep %d\n", i);}
       ~I() {printf ("wolf\n");}
       int Get() {return i;}
       int f(I& a) {a.i += i; return a.i;}
       int g(I a) {a.i += i; I tmp (a.i+400); return tmp.Get();}
     };
int main() {
I x(2000); I y; int a, b;
a = x.f(y); b = x.g(y);
printf ("%d, %d\n", a, b);
printf ("%d, ", x.Get());
printf ("%d\n", y.Get());
return 0;
}

#include <stdio.h>
class A {
        int i;
        public:
    A(int x) {i=x; printf ("mercury\n");}
    virtual ~A() {printf ("venus\n");}
    int & Get() {return i;}
    void f(int a) {i+=a;}
    virtual int g(int a) const {return 10+a;}
    int h() const {return 1;}
    void t() {f(g(2000));}
};
class B : public A {
       public:
    B():A(7) {printf ("earth\n");}
   ~B() {printf ("mars\n");}
    void f(int a) {Get()-=a;}
    int g(int a) const {return -400;}
    int h() const {return 80;}
};
int main() {
A a(350);
B b;
A *p = &b;
a.t(); b.t();
printf ("%d %d\n", b.g(a.Get()), p->g(a.Get()));
printf ("%d %d\n", b.h(), p->h());
return 0;
}