I want to ask 6 digit pins from user, I tried this code, it does work. The problem is that it cannot read pin starting from 0. The objective of the code is to read 6 digit pin no matter what the start is, as long as it is an integer it will read the correct output.

using namespace std;

int main(){
    int pin[0];

    cin>>pin[0];

    if (pin[0] >= 100000 && pin[0] <= 999999) {
        cout << pin[0];
    }
    else {
        cout << "Invalid input!";
    }


}```

CodePudding user response：

On the one hand you want to read an integer (you are comparing it to 100000 and 999999) on the other hand you want to read individual digits into an array. It cannot be both. And you cannot have an array of size 0.

Just stay with the single integer. If you want to access individual digits you can convert it to a string and access characters (you already made sure that it has 6 digits):

#include <iostream>
#include <string>
int main(){
    int pin;

    std::cin>>pin;

    if (pin >= 100000 && pin <= 999999) {
        std::cout << pin << "\n";
        std::string pin_string = std::to_string(pin);
        for (size_t i=0; i<6;   i){
            std::cout << pin_string[i] << "\n";
        }
    }
    else {
        std::cout << "Invalid input!";
    }
}

CodePudding user response：

Heres one way to do it.

1. Read CIN as std::string
2. Regex recv string for digit only
3. Confirm recv string len is == 6
4. Do w/e you want with it from there

Another way could be getChar()