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  1. #include <iostream>
  2. using namespace std;
  3. bool bin(int n) {
  4.     if (n == 0) return true;        
  5.     while (n > 0) {
  6.         if (n % 10 != 0 && n % 10 != 1) {
  7.             return false;           
  8.         }
  9.         n /= 10;
  10.     }
  11.     return true;
  12. }
  13. int Dec(int n) {
  14.     int dec = 0;
  15.     while (n > 0) {
  16.         dec = dec * 2 + n % 10;
  17.         n /= 10;
  18.     }
  19.     return dec;
  20. }
  21.  
  22. int main() {
  23.     int number;
  24.  
  25.     cout << "Введите число в двоичной системе счисления: ";
  26.     cin >> number;
  27.  
  28.     if (!bin(number)) {
  29.         cout << "Ошибка" << endl;
  30.     } else {
  31.         int result = Dec(number);
  32.         cout << hex << result << endl;  
  33.     }
  34.  
  35.     return 0;
  36. }
Success #stdin #stdout 0.01s 5316KB
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Standard input is empty
stdout
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Введите число в двоичной системе счисления: Ошибка
https://ideone.com/iPC0O7
language:
C++ (gcc 8.3)
created:
19 hours ago
visibility:
public

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