重定义错误 C++

Question

I am having trouble with the portion where I need to print the day. I tried making a second variable but it is not working. Basically I take a user input for their birthday. Then I'm trying to call this function that determines the day of birth (it determines a number that represents a day). Then I am trying to send this number to the function that takes the number and prints the birthday day in words. I am now getting the error that 'int day2' redefinition.

Here is my code:

void determineDayOfBirth() {

    int day;
    int month;
    int year;
    char backslash;
    char backslash2;

    cout << "Enter your date of birth" << endl;
    cout << "format: month / day / year -->" << endl;
    cin >> month >> backslash >> day >> backslash2 >> year;

    if (isValidDate(month, day, year)) {
        int day2;
        cout << "You were born on a: ";
        int day2 = determineDay(month, day, year);
        printDayOfBirth(day2); 
        cout << endl;
        cout << "Have a great birthday!!!";
    }
    else {
        cout << "Invalid date";
    }
    return;
}

Answer 1

Remove the int from the second assignment, you can't define a variable twice in the same block.

To fix your code, replace:

int day2;
cout << "You were born on a: ";
int day2 = determineDay(month, day, year);

With:

cout << "You were born on a: ";
int day2 = determineDay(month, day, year);

Answer 2

You have put two times "int day2", which indeed is a redefinition. You have to define "day2" only once:

if (isValidDate(month, day, year)) {
    int day2;
    cout << "You were born on a: ";
    day2 = determineDay(month, day, year); // REMOVE "int"
    printDayOfBirth(day2); 
    cout << endl;
    cout << "Have a great birthday!!!";
}
else {
    cout << "Invalid date";
}
return;

Answer 3

The cause of the problem is

    int day2;
    cout << "You were born on a: ";
    int day2 = determineDay(month, day, year);

The second is a redefinition of day2 .

Remove the int keyword from that line, and it will become a simple assignment.

Answer 4

you can't declare two variables in the same scope so day2 is declared twice in your if block. you can directly write:

//if(){
     int day2 = determineDay(month, day, year);
//}