feat(Week04): Add exercises and solutions

1 files changed, 24 insertions, 0 deletions

diff --git a/Week04/Exercise21.cpp b/Week04/Exercise21.cpp
new file mode 100644
index 0000000..d98a43d
--- /dev/null
+++ b/Week04/Exercise21.cpp
@@ -0,0 +1,24 @@
+#include <iostream>
+
+int main() {
+    unsigned int S, n;
+    std::cin >> S >> n;
+
+    double a = S, power_10 = 1;
+    while (a > 100.0) {
+        a /= 100.0;
+        power_10 *= 10.0;
+    }
+
+    double x_i = (10.0 - 190.0 / (a + 20.0)) * power_10;
+    double x_n = (x_i + S / x_i) / 2.0;
+    for (unsigned int i = 1; i < n; i++) {
+        double old_x = x_n;
+        x_n = (x_i + S / x_i) / 2.0;
+        x_i = x_n;
+    }
+
+    std::cout << x_i;
+
+    return 0;
+}