Question

How to convert binary number to decimal in C++

Answer 1

#include <iostream>
#include <cmath>
  
using namespace std;
  
int binary_to_decimal(string s) { 
    int dec = 0;

    for (int i = s.length() - 1, j = 0; i >= 0; i--, j++) { 
        if (s[i] == '1') {
            dec += pow(2, j); 
        }
    } 
    return dec; 
} 
    
int main() 
{ 
    string s = "10101011";  
  
    cout << binary_to_decimal(s) << endl; 
} 
  
  
  
/*
run:
  
171
  
*/

 

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