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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. template <typename T>
  5. class Matrix {
  6. protected:
  7.     T** a;
  8.     int size1;
  9.     int size2;
  10.  
  11. public:
  12.     Matrix(int n, int m) {
  13.         while (n <= 0 && m <= 0) {
  14.             cout << "Введіть інший розмір";
  15.             cin >> n >> m;
  16.         }
  17.         size1 = n;
  18.         size2 = m;
  19.         a = new T* [n];
  20.         for (int i = 0; i < n; i++) {
  21.             a[i] = new T[m];
  22.         }
  23.     }
  24.  
  25.     Matrix() : size1(1), size2(1) {
  26.         a = new T* [1];
  27.         a[0] = new T[1];
  28.     }
  29.  
  30.     ~Matrix() {
  31.         for (int i = 0; i < size1; i++) {
  32.             delete a[i];
  33.         }
  34.         delete[] a;
  35.     }
  36.  
  37.     T* operator[](const int i) { return a[i]; }
  38.  
  39.     // Перевантаження +
  40.     Matrix operator+(const Matrix& left) const {
  41.         Matrix result(size1, size2);
  42.         for (int i = 0; i < size1; i++) {
  43.             for (int j = 0; j < size2; j++) {
  44.                 result.a[i][j] = a[i][j] + left.a[i][j];
  45.             }
  46.         }
  47.         return result;
  48.     }
  49.  
  50.     // Перевантаження -
  51.     Matrix operator-(const Matrix& left) const {
  52.         Matrix result(size1, size2);
  53.         for (int i = 0; i < size1; i++) {
  54.             for (int j = 0; j < size2; j++) {
  55.                 result.a[i][j] = a[i][j] - left.a[i][j];
  56.             }
  57.         }
  58.         return result;
  59.     }
  60.  
  61.     // Перевантаження *
  62.     Matrix operator*(const Matrix& right) const {
  63.         Matrix result(size1, right.size2);
  64.         for (int i = 0; i < size1; i++) {
  65.             for (int j = 0; j < right.size2; j++) {
  66.                 result.a[i][j] = 0;
  67.                 for (int k = 0; k < size2; k++) {
  68.                     result.a[i][j] += a[i][k] * right.a[k][j];
  69.                 }
  70.             }
  71.         }
  72.         return result;
  73.     }
  74.  
  75.     friend ostream& operator<<(ostream& x, const Matrix& a) {
  76.         for (int i = 0; i < a.size1; i++) {
  77.             for (int j = 0; j < a.size2; j++) {
  78.                 x << a.a[i][j] << " ";
  79.             }
  80.             x << endl;
  81.         }
  82.         return x;
  83.     }
  84.  
  85.     friend istream& operator>>(istream& is, const Matrix& a) {
  86.         for (int i = 0; i < a.size1; i++) {
  87.             for (int j = 0; j < a.size2; j++) {
  88.                 is >> a.a[i][j];
  89.             }
  90.         }
  91.         return is;
  92.     }
  93. };
  94.  
  95. template<typename T>
  96. class SquareMatrix : public Matrix<T> {
  97. public:
  98.     SquareMatrix(int size) : Matrix<T>(size, size) {}
  99.  
  100.     T trace() {
  101.         T sum = 0;
  102.         for (int i = 0; i < this->size1; i++) {
  103.             sum += this->a[i][i];
  104.         }
  105.         return sum;
  106.     }
  107. };
  108.  
  109. int main(void)
  110. {
  111.     Matrix<double> a(4, 3);
  112.     cin >> a;
  113.     Matrix<double> b(3, 4);
  114.     cin >> b;
  115.     Matrix<double> c = a * b;
  116.     cout << c;
  117.     return 0;
  118. }
Success #stdin #stdout 0.01s 5280KB
comments (?)
stdin
copy 
1 2 3
4 5 6
7 8 9
10 11 12
1 0 0 1
0 1 1 0
1 0 1 1
stdout
copy 
4 2 5 4 
10 5 11 10 
16 8 17 16 
22 11 23 22
https://ideone.com/mciEnB
трикутник спадкування рівнобедренний
language:
C++14 (gcc 8.3)
created:
2 days ago
visibility:
public

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