這可能是一個非常簡單的問題，但請原諒我，因為我是新人。這是我的代碼：#include <iostream>#include <string>#include <sstream>using namespace std;int main (){    string name;   int i;   string mystr;   float price = 0;   cout << "Hello World!" << endl;   cout << "What is your name? ";   cin >> name;   cout << "Hello " << name << endl;   cout << "How old are you? ";   cin >> i;   cout << "Wow " << i << endl;   cout << "How much is that jacket? ";   getline (cin,mystr);   stringstream(mystr) >> price;   cout << price << endl;   system("pause");   return 0;}問題是當被問及how much is that jacket?getline沒有要求用戶輸入時，只輸入初始值“0”。為什么是這樣？