'commit'

TangDou/LuoGuBook/L1_9.cpp

@@ -0,0 +1,13 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+
+int main() {
+    int r = 5;
+    const double PI = 3.141593;
+    cout << 2 * PI * r << endl;
+    cout << PI * r * r << endl;
+    cout << 4.0 / 3 * PI * r * r * r << endl;
+
+    return 0;
+}