c++ - 为什么这告诉我 “gender”是在线上未声明的标识符

Question

int main()
{
    introduction();
    int x;
    cin >> x;
    if (x == 1)
        cout << endl << "1. Only state true information." << endl << "2. Do not copy this servey and distribute it AT ALL." << endl << "3. Do not falsely advertise this survey anywhere." << endl << endl;
    cout << "(Press 1 to start survey)" << endl;
    int y;
    cin >> y;
    if (y == 1)
        int gender = askGender();
    int job = askJobOrNot();
    int sport = askFavSport();
    int music = askFavMusicGenre();
    int birth = askBirthPlace();
    int colour = askFavColour();
    cout << endl << "Thank you, you have successfully completed the survey! (:  " << endl;
    cout << "(Press 1 to show results, and press 2 to quit)" << endl;
    int s;
    cin >> s;
    if (s == 1)
        printResults(gender, job, sport, music, birth, colour);
    if (s == 2)
        quitProgram();
    return 0;
}

当我编译这段代码时，它在第23行给了我一个错误，告诉我变量“gender”(我在函数“printResults”中作为参数放置)是一个未声明的标识符，即使我在11行之前明确声明了它也是如此。 (第12行)。为什么会这样呢？

Answer 1

更改此:

if (y == 1)
    int gender = askGender();

对此:

int gender;
if (y == 1)
    gender = askGender();

甚至更好的是:

int gender = 0; // default: 0
if (y == 1)
    gender = askGender();