added leibniz formula for calculating pi in c++

Author: pluto-tofu

src/cpp/LeibnizFormulaForPi.cpp

@@ -0,0 +1,23 @@
+#include <iostream>
+using namespace std;
+
+float pi = 0.0;
+float denominator = 1.0;
+float operation = 1.0;
+
+float pi_calculator(int terms)
+{
+    for (int i = 0; i < terms; i++)
+    {
+        pi += operation * (4.0 / denominator);
+        denominator += 2.0;
+        operation *= -1.0;
+    }
+    return pi;
+}
+
+int main()
+{
+    float result = pi_calculator(100000);
+    cout << result;
+}