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对于练习6.50中，f(42) 的最佳匹配为 f(int), 但可行函数应该包含两个吧，f(int) 和 f(double, double=3.14) 。
f(int)
f(double, double=3.14)
如下程序所示
#include <iostream> using namespace std; void f(double x, double y=3.14) { cout << "double x, double y=3.14" << endl; } int main() { f(42); }
运行结果如图所示：