update

homework_2.cpp

@@ -0,0 +1,24 @@
+#include <iostream>
+#include <iomanip>
+#include <cmath>
+
+using namespace std;
+
+int main() {
+    double r;
+    const double PI = 3.14;
+    cout << "\u8f93\u5165\u534a\u5f84: ";
+    cin >> r;
+
+    if (r < 0 || r > 100) {
+        cout << "\u8f93\u5165\u9519\u8bef: \u534a\u5f84\u5fc5\u987b\u4e3a0\u5230100\u4e4b\u95f4" << endl;
+        return 1;
+    }
+
+    double volume = (4.0 / 3) * PI * pow(r, 3);
+
+    cout << fixed << setprecision(2);
+    cout << "\u4f53\u79ef: " << volume << endl;
+
+    return 0;
+}