P6.15 P35957 Middle digits

#include <iostream>
using namespace std;

bool isEven(int n) {
    if(n%2==0) return true;
    else return false;
}


int digits(int n) {
    int d=1;
    while (n/10!=0) {
        n/=10;
        d++;
    }
    return d;
}


int midNumber(int n) {
    for (int i=(digits(n)/2);i>0;i--) n=n/10;
    return n%10;
}



int main() {
    int plays,A,B,result=0;
    cin>>plays;
    cin>>A;
    if (not isEven(digits(A))) {
        for (int i=(plays-1);i>0;i--) {
            cin>>B;
            if (isEven(digits(B)) or midNumber(A)!=midNumber(B)) {
                result=1;
                break;
            }
            cin>>A;
            if (isEven(digits(A)) or midNumber(A)!=midNumber(B)) {
                result=2;
                break;
            }
        }
        if (result==0) {
            cin>>B;
            if ((isEven(digits(B)) or midNumber(A)!=midNumber(B)) and result==0) result=1;
        }
    }
    else result=2;

    switch(result) {
        case 1:
            cout<<"A"<<endl;
            break;
        case 2:
            cout<<"B"<<endl;
            break;
        case 0:
            cout<<"="<<endl;
            break;
    }
}