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Program Discussion :: Bitwise Operator
Home > Programs > Bitwise Operator

21. Write an efficient program to convert from binary to decimal number 

Answer:

#include<iostream>

using namespace std; 
int main()
{
    long bin, dec = 0, rem, num, base = 1;
    cout << "Enter the binary number(1s and 0s) : ";
    cin >> num;
    bin = num;
    while (num > 0)
    {
        rem = num % 10;
        dec = dec + rem * base;
        base = base * 2;
        num = num / 10;
    }
    cout << "The decimal equivalent of " << bin << " : " << dec << endl;
    return 0;
}

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