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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.     Matrix operator+(const Matrix& right ) const {
  40.         Matrix result(size1, size2);
  41.         for (int i = 0; i < size1; i++) {
  42.             for (int j = 0; j < size2; j++) {
  43.                 result.a[i][j] = a[i][j] + right.a[i][j];
  44.             }
  45.         }
  46.         return result;
  47.     }
  48.  
  49.     Matrix operator-(const Matrix& right) const {
  50.         Matrix result(size1, size2);
  51.         for (int i = 0; i < size1; i++) {
  52.             for (int j = 0; j < size2; j++) {
  53.                 result.a[i][j] = a[i][j] - right.a[i][j];
  54.             }
  55.         }
  56.         return result;
  57.     }
  58.  
  59.     Matrix operator*(const Matrix& right) const {
  60.         Matrix result(size1, right.size2);
  61.         for (int i = 0; i < size1; i++) {
  62.             for (int j = 0; j < right.size2; j++) {
  63.                 result.a[i][j] = 0;
  64.                 for (int k = 0; k < size2; k++) {
  65.                     result.a[i][j] += a[i][k] * right.a[k][j];
  66.                 }
  67.             }
  68.         }
  69.         return result;
  70.     }
  71.  
  72.     friend ostream& operator<< (ostream& os, const Matrix& a)  {
  73.     for (int i = 0; i < a.size1; i++) {
  74.         for (int j = 0; j < a.size2; j++) {
  75.             os << a.a[i][j] << " ";
  76.         }
  77.         os << endl;
  78.     }
  79.     return os;
  80. }
  81.  
  82.  
  83.     friend istream& operator>>(istream& is, const Matrix& a) {
  84.         for (int i = 0; i < a.size1; i++) {
  85.             for (int j = 0; j < a.size2; j++) {
  86.                 is >> a.a[i][j];
  87.             }
  88.         }
  89.         return is;
  90.     }
  91. };
  92.  
  93. template<typename T>
  94. class SquareMatrix : public Matrix<T> {
  95. public:
  96.     SquareMatrix(int size) : Matrix<T>(size, size) {}
  97.  
  98.     T trace() {
  99.         T sum = 0;
  100.         for (int i = 0; i < this->size1; i++) {
  101.             sum += this->a[i][i];
  102.         }
  103.         return sum;
  104.     }
  105. };
  106.  
  107. int main(void)
  108. {
  109.     Matrix<double> a(4, 3);
  110.     cin >> a;
  111.     Matrix<double> b(4, 3);
  112.     cin >> b;
  113.     Matrix<double> c = a - b;
  114.     cout << c;
  115.     return 0;
  116. }
  117.  
Success #stdin #stdout 0s 5316KB
comments (?)
stdin 
1 2 3
4 5 6
7 8 9
10 11 12
1 4 3
4 5 6
7 8 9
10 11 12
stdout 
0 -2 0 
0 0 0 
0 0 0 
0 0 0
https://ideone.com/i9Yskl
трикутник спадкування рівнобедренний
language:
C++14 (gcc 8.3)
created:
1 day ago
visibility:
public

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