2進制轉10進制

//
//  main.cpp
//  2進制轉10進制
//
//  Created by Chris on 2017/3/18.
//  Copyright © 2017年 Chris. All rights reserved.
//

#include <iostream>
#include <stdlib.h>
#include <math.h>

using namespace std;

int main() {
    int bin[ ] = { 0 },  m = 0, brami = 0, mn = 0, h = 0, n = 0, y = 0, x = 0;
    while (1){

        brami = 0;

        cout << "Enter Binary ";
        cin >> n;

        x = n;
        y = n;

        while (x != 0){
            x /= 10;
            m ++;
        }           //計算n值為幾位元

        for (int i = 0 ; i < m ; i ++){
            h = y % 10;
            if (h > 1 || h < 0) goto end;
            y /= 10;
        }           //判斷是否為2進制

        while (n != 0){
            for (int i = 0 ; i < m ; i ++){
                bin [ i ] = n % 10;
                n /= 10;
            }           //將n的餘數放入array
        }

        for (int i = 0 ; i < m ; i ++){
            mn = 0;
            mn = pow (2 , i);           //求第i位元的值
            brami = brami + mn * bin [ i ];             //將 [i]array * i位元值 放入brami
        }

        cout << endl;
        cout << brami << endl;
    }

end:
    cout << "超出數值" << endl;

    return 0;
}