labs 1-6: init

Signed-off-by: Amneesh Singh <natto@weirdnatto.in>

lab2/4.cpp

@@ -0,0 +1,96 @@
+#include <iostream>
+#include <vector>
+using namespace std;
+
+class Matrix {
+private:
+  unsigned int r, c;
+  vector<vector<int>> matrix;
+
+public:
+  Matrix() = default;
+  Matrix(int, int);
+  void init(vector<vector<int>>);
+  unsigned int getRows();
+  unsigned int getColumns();
+  Matrix operator*(Matrix);
+  void display();
+};
+
+Matrix::Matrix(int r, int c) {
+  this->r = r, this->c = c;
+  this->matrix = vector<vector<int>>(r, vector<int>(c));
+}
+
+void Matrix::init(vector<vector<int>> src) {
+  unsigned int i, j;
+
+  if (this->r > src.size())
+    exit(1);
+
+  for (i = 0; i < this->r; i++) {
+    if (c > src[i].size())
+      exit(1);
+
+    for (int j = 0; j < this->c; j++)
+      this->matrix[i][j] = src[i][j];
+  }
+}
+
+inline unsigned int Matrix::getRows() { return r; }
+
+inline unsigned int Matrix::getColumns() { return c; }
+
+Matrix Matrix::operator*(Matrix operand) {
+  unsigned int i, j, k;
+  unsigned int r, c;
+  unsigned int common;
+  Matrix m;
+
+  if (this->getColumns() != operand.getRows())
+    exit(1);
+
+  r = this->getRows();
+  c = operand.getColumns();
+
+  m = Matrix(r, c);
+
+  common = this->getColumns();
+
+  for (i = 0; i < r; i++) {
+    for (j = 0; j < c; j++) {
+      int s = 0;
+      for (k = 0; k < common; k++)
+        s += this->matrix[i][k] * operand.matrix[k][j];
+      m.matrix[i][j] = s;
+    }
+  }
+
+  return m;
+}
+
+void Matrix::display() {
+  unsigned int i, j;
+
+  for (i = 0; i < this->r; i++) {
+    for (j = 0; j < this->c; j++)
+      cout << this->matrix[i][j] << ' ';
+    cout << endl;
+  }
+}
+
+int main() {
+  Matrix a(2, 3), b(3, 4);
+  Matrix m;
+
+  a.init(vector<vector<int>>{{1, 2, -3}, {3, 2, 1}});
+
+  b.init(
+      vector<vector<int>>{{1, -4, -4, 1}, {0, 4, 4, -34}, {3, 1231, 0, -9653}});
+
+  m = a * b;
+
+  m.display();
+
+  return 0;
+}