main.cpp

1) Jan Kowalski dostał oceny z polskiego, angielskiego i fizyki. Jeśli
< 2 - tragedia
<= 2; 3> -  jako tako
<= 3, 4 >= środkowa
< 4 super
srednia wazona,
2) Takie jak 1 tylko z user sam sobie dodaje przedmioty
3) tab 10x10, całkowite, 0 -100, licznik, parzyste
4) takie jak pierwsze i min, max współrzędnych wierzchołków

1)
#include <cstdlib>
#include <iostream>
#include <vector>

using std::cout;
using std::cin;
using std::endl;

struct Lesson;
typedef std::vector<Lesson> Lessons;

struct Lesson {
   std::string name;
   short grade;
   short weight;   
   
   Lesson& enter() {
          cout << "Wprowadz ocene i wage dla przedmiotu " << this->name << endl;
          cout << "Ocena: "; cin >> this->grade;
          cout << "Waga: ";  cin >> this->weight;
          return *this;
   }
   
   static float getAverage(const Lessons& lessons) {
          float sum = 0,
                weights = 0;
          for (short i = 0;i < lessons.size();++i) {
              weights += (int)lessons[i].weight;
              sum += (int)lessons[i].grade * (int)lessons[i].weight;
          }
          return sum / weights;
   }
   
   static std::string toString(const float& avg) {
          if (avg < 0) return "tragedia";
          else if (avg >= 2 && avg < 3) return "jako tako";
          else if (avg >= 3 && avg <= 4) return "srodkowa";
          else return "super"; 
   }
    
   static void prompt() {
      cout << "Wpisuj kolejno przedmioty z ktorych chcesz miec srednia wazona:"
           << endl;
           
      const Lesson t[] = {
            {name: "Polski"},
            {name: "Angielski"},
            {name: "Fizyka"}
      };
      Lessons lessons(t, t + sizeof(t) / sizeof(t[0]));
      for(int i = 0;i < lessons.size();++i) {
              lessons[i].enter();
      }
      
      const float avg = Lesson::getAverage(lessons);
      cout 
           << "Twoja srednia to "
           << avg
           << " i jest to "
           << Lesson::toString(avg)
           << endl;
   }
};
 
int main(int argc, char *argv[])
{
    Lesson::prompt();
    system("PAUSE");
    return EXIT_SUCCESS;
}


2)
#include <cstdlib>
#include <iostream>
#include <vector>

using std::cout;
using std::cin;
using std::endl;

struct Lesson;
typedef std::vector<Lesson> Lessons;

struct Lesson {
   std::string name;
   short grade;
   short weight;   
   
   static Lesson enter() {
          Lesson tmp = {"", 0, 0};
          cout << "Nazwa: "; cin >> tmp.name;
          cout << "Ocena: "; cin >> tmp.grade;
          cout << "Waga: ";  cin >> tmp.weight;
          return tmp;
   }
   
   static float getAverage(const Lessons& lessons) {
          float sum = 0,
                weights = 0;
          for (short i = 0;i < lessons.size();++i) {
              weights += (int)lessons[i].weight;
              sum += (int)lessons[i].grade * (int)lessons[i].weight;
          }
          return sum / weights;
   }
   
   static std::string toString(const float& avg) {
          if (avg < 0) return "tragedia";
          else if (avg >= 2 && avg < 3) return "jako tako";
          else if (avg >= 3 && avg <= 4) return "srodkowa";
          else return "super"; 
   }
    
   static void prompt() {
      cout << "Wpisuj kolejno przedmioty z ktorych chcesz miec srednia wazona:"
           << endl;
      
      Lessons lessons;
      while(true) {
                  lessons.push_back(Lesson::enter());
                  cout << "Koniec? Jesli tak to t, jesli n to nie wpisz" << endl;
                  
                  char operation;
                  cin >> operation;
                  if(operation == 't')
                               break;
      }
      
      const float avg = Lesson::getAverage(lessons);
      cout 
           << "Twoja srednia to "
           << avg
           << " i jest to "
           << Lesson::toString(avg)
           << endl;
   }
};
 
int main(int argc, char *argv[])
{
    Lesson::prompt();
    system("PAUSE");
    return EXIT_SUCCESS;
}

3) i 4)
#include <cstdlib>
#include <iostream>
#include <stdlib.h>
#include <time.h>

using std::cout;
using std::cin;
using std::endl;

int main(int argc, char *argv[])
{
    srand(time(NULL));
    
    int tab[10][10], parity = 0;
    for (int i = 0;i < 10;++i) {
        for (int j = 0;j < 10;++j) {
            tab[i][j] = rand() % 100;
            parity += !(tab[i][j] % 2) ? 1 : 0;
        }
    }
    cout << "Parzystych: " << parity << endl;
    system("PAUSE");
    return EXIT_SUCCESS;
}

4) 5) #include <cstdlib>
#include <iostream>
#include <stdlib.h>
#include <time.h>

using std::cout;
using std::cin;
using std::endl;

struct vec { int x, y, val; };
    
int main(int argc, char *argv[])
{
    srand(time(NULL));
    
    vec max = {0, 0, -1};
    vec min = {0, 0, -1};
    int tab[10][10];
    
    for (int i = 0;i < 10;++i) {
        for (int j = 0;j < 10;++j) {
            tab[i][j] = rand() % 100;
            if (tab[i][j] >= max.val || max.val == -1) {
               max = (vec){i, j, tab[i][j]};
            } 
            if(tab[i][j] <= min.val || min.val == -1) {
               min = (vec){i, j, tab[i][j]};
            }
        }
    }
    cout << "max: " << max.val << " wspolrzedne: (" << max.x << ", " << max.y << ")" << endl; 
    cout << "min: " << min.val << " wspolrzedne: (" << min.x << ", " << min.y << ")" << endl; 
    system("PAUSE");
    return EXIT_SUCCESS;
}