Check out example codes for "built in function in c++ for binary to decimal". It will help you in understanding the concepts better.

Code Example 1

#include <bits/stdc++.h>

using namespace std;

int main(void){
    bitset<8> bits("1000");
    int ab = bits.to_ulong();
    cout << ab << "\n";
    
    return 0;
}

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