A practice in int/float handling and structs

EmpiricalMass/main.cpp

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+#include <iostream>
+#include <cmath>
+
+using namespace std;
+
+struct Isotope
+{
+    int A{};
+    int Z{};
+};
+
+float empiricalMass(Isotope iso) {
+    int N = iso.A - iso.Z;
+    int delta = -1;
+
+    if (iso.A % 2 != 0) {
+        delta = 0; // mixed parity
+    } else if (iso.Z % 2 == 0 && N % 2 == 0) {
+        delta = 1; // even-even parity
+    }
+
+    float B = 15.75 * iso.A - 94.8 * pow((iso.A/2. - iso.Z), 2.) / iso.A
+            - 17.8 * pow(iso.A, 2./3.) - 0.71 * pow(iso.Z, 2.) * pow(iso.A, -1./3.)
+            + 34 * delta * pow(iso.A, -3./4.);
+
+    return B/iso.A;
+}
+
+int main()
+{
+    Isotope U235{ 235, 92 };
+    float mass = empiricalMass(U235);
+    cout << "U235: ";
+    cout << mass;
+    cout << " MeV per nucleon\n";
+    return 0;
+}