c ++更改函数的变量参数 [英] c++ change function's variable argument

问题描述

我想改变作为参数传递给这个函数的变量:

i want to change my variable passed as argument to this function:

bool verifyStudent(string id, string name, int grade, int points, string type) {
if(!verifyId(id)){
    cerr << "Please enter 8 charactes id! format: YYMMDDCC\n";
    cin >> id;
    return false;
} else
if(!verifyName(name)){
    cerr << "Please enter name to 35 characters!\n";
    cin >> name;
    return false;
} else
if(!verifyGrade(grade)){
    cerr << "Please enter class between 8 and 12!\n";
    cin >> grade;
    return false;
} else
if(!verifyPoints(points)){
    cerr << "Please enter points between 0 and 300!\n";
    cin >> points;
    return false;
} else
if(!verifyType(type)){
    cerr << "Please enter 1 charater type! format: R,r - regional, D,d - district, N,n - national, I,i - international\n";
    cin >> type;
    return false;
} else {
    return true;
}

}

我应该如何访问给定的变量并在其他函数未验证时更改它?

how i should get access to the given variable and change it when it isn't verified by other function?

这是我调用函数的方式:

here is the way i call the function:

verifyStudent(iId, iName, iGrade, iPoints, iType);

推荐答案

为了改变参数，你必须采用references:

In order to change the arguments, you would have to take references:

bool verifyStudent(string& id, string& name, int& grade, int& points, string& type) 

虽然我想说这个函数不像 verifyAndCorrectStudentIfNeeded 那样verifyStudent.

Although I'd say that function is not verifyStudent as much as verifyAndCorrectStudentIfNeeded.

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