Data commit

Task/Eulers-constant-0.5772.../Rust/eulers-constant-0.5772....rust

@@ -0,0 +1,23 @@
+// 20220322 Rust programming solution
+
+fn gamma(N: u32) -> f64 { // Vacca series https://w.wiki/4ybp
+
+    return 1f64 / 2f64 - 1f64 / 3f64
+        + ((2..=N).map(|n| {
+            let power: u32 = 2u32.pow(n);
+            let mut sign: f64 = -1f64;
+            let mut term: f64 = 0f64;
+
+            for denominator in power..=(2 * power - 1) {
+                sign *= -1f64;
+                term += sign / f64::from(denominator);
+            }
+
+            return f64::from(n) * term;
+        }))
+        .sum::<f64>();
+}
+
+fn main() {
+    println!("{}", gamma(23));
+}