Adding lab 5

05-cpp/lab.cpp

@@ -0,0 +1,58 @@
+#include<cmath>
+#include<iostream>
+
+class Binom {
+private:
+    int n;
+    double p;
+
+public:
+    Binom(int n, double p) : n(n), p(p) {};
+    int factorial(int n) const;
+    double choose(int a, int b) const;
+    double dbinom(int k) const;
+    void print(int k) const;
+};
+
+inline int Binom::factorial(int n) const {
+    if (n == 0) {
+        return 1;
+    }
+    return n * factorial(n - 1);
+}
+
+inline double Binom::choose(int a, int b) const {
+
+    double num = static_cast<double>(factorial(a));
+    double den = static_cast<double>(
+        factorial(b) *
+        factorial(a - b)
+        );
+    return num / den;
+
+}
+
+inline double Binom::dbinom(int k) const {
+    return
+        choose(this->n, k) *
+        std::pow(this->p, k) *
+        std::pow(1.0 - this->p, this->n - k);
+}
+
+inline void Binom::print(int k) const {
+    std::printf(
+        "P(Y=%-2d; n=%d, p=%.2f) = %.4f\n",
+        k, this->n, this->p, this->dbinom(k)
+    );
+}
+
+int main() {
+
+    Binom binom(10, 0.5);
+
+    for (int k = 0; k <= 10; k++)
+        binom.print(k);
+
+    return 0;
+
+}