Data commit

Task/Euler-method/Rust/euler-method.rust

@@ -0,0 +1,34 @@
+fn header() {
+    print!("    Time: ");
+    for t in (0..100).step_by(10) {
+        print!(" {:7}", t);
+    }
+    println!();
+}
+
+fn analytic() {
+    print!("Analytic: ");
+    for t in (0..=100).step_by(10) {
+        print!(" {:7.3}", 20.0 + 80.0 * (-0.07 * f64::from(t)).exp());
+    }
+    println!();
+}
+
+fn euler<F: Fn(f64) -> f64>(f: F, mut y: f64, step: usize, end: usize) {
+    print!(" Step {:2}: ", step);
+    for t in (0..=end).step_by(step) {
+        if t % 10 == 0 {
+            print!(" {:7.3}", y);
+        }
+        y += step as f64 * f(y);
+    }
+    println!();
+}
+
+fn main() {
+    header();
+    analytic();
+    for &i in &[2, 5, 10] {
+        euler(|temp| -0.07 * (temp - 20.0), 100.0, i, 100);
+    }
+}