asdf.cc

#include <cstdio>
#include <iostream>
#include <string>

class Rectangle {
 private:
  int a;
  int b;

 public:
  Rectangle () : a(0), b(0) {}
  float calculateField() const;
  std::string toString() const;
  bool fromString(const std::string& s);
};

float Rectangle::calculateField() const {
  return a * b;
}

bool Rectangle::fromString(const std::string& s) {
  int tmp_a;
  int tmp_b;
  if (sscanf(s.c_str(), "%i %i", &tmp_a, &tmp_b) != 2) {
    return false;
  }

  a = tmp_a;
  b = tmp_b;
  return true;
}

std::string Rectangle::toString() const {
  return std::to_string(calculateField());
}

int main() {
  const size_t ARRAY_SIZE = 3;
  Rectangle rectangles[ARRAY_SIZE];

  for (size_t i = 0; i < ARRAY_SIZE; i++) {
    printf("Podaj boki a oraz b prostokata %i: ", (int)(i + 1));
    fflush(stdout);

    std::string line;
    std::getline(std::cin, line);

    if (!rectangles[i].fromString(line)) {
      fprintf(stderr, "Zle podane dane. Good bye.\n");
      return 1;
    }
  }

  putchar('\n');

  for (size_t i = 0; i < ARRAY_SIZE; i++) {
    printf("Pole %i prostokata wynosi: %s\n",
      (int)(i + 1), rectangles[i].toString().c_str());
  }
}