feat: Submit Wgtteol's homework_2.

src/群友提交/第二题/Wgtteol.cpp

@@ -0,0 +1,35 @@
+#include <iostream>
+#include <format>
+#include <numbers>
+/*
+struct X {
+    size_t operator() (size_t n) {
+        return n;
+    }
+};
+
+X operator ""_f(const char* str_c, size_t n)
+{
+    return {};
+}
+*/
+
+auto operator ""_f(const char* str_c, size_t n)
+{
+    return [=] (auto&& ...elems)
+    {
+        return std::vformat(str_c, std::make_format_args(elems...));
+    };
+}
+
+int main() {
+    //std::cerr << "12345xyz"_f(13) << std::endl;
+    std::cout << "ÀÖ :{} *\n"_f(5);
+    std::cout << "ÀÖ :{0} {0} *\n"_f(5);
+    std::cout << "ÀÖ :{:b} *\n"_f(0b01010101);
+    std::cout << "{:*<10}"_f("¬ɪ");
+    std::cout << '\n';
+    int n{};
+    std::cin >> n;
+    std::cout << "¦Ð£º{:.{}f}\n"_f(std::numbers::pi_v<double>, n);
+}