为什么结构在Xcode中不起作用,当它们在Visual C中时呢？需要帮助

#include <iostream>
#include <string>

using namespace std;

struct acct {        // bank account data
    int     num;      // account number
    string name;      // owner of account
    float   balance; // balance in account
};

int main() {

    acct account;

    cout << "Enter new account data: " << endl;
    cout << "Account number: ";
    cin  >> account.num;
    cout << "Account name: ";
    cin  >> account.name;
    cout << "Account balance: ";
    cin  >> account.balance;

    return 0;

}

它给出了两个错误,一个说它预期’;’在帐户之前(在声明主要之后),并且第二个帐户未被宣布为cin>> account.num;