C++ Examples

WAP in C++ to Convert Binary number to Decimal number

The Program in C++ to Convert Binary number to Decimal number is given below:

#include <iostream>
using namespace std;

int main() {
    int binary, decimal = 0, base = 1;
    cout << "Hello Codeauri Family, Enter a binary number to find its decimal equivalent:\n";
    cin >>binary;
    while (binary > 0) {
        int lastDigit = binary % 10;
        binary = binary / 10;
        decimal += lastDigit * base;
        base = base * 2;
    }
    cout << "Well,the decimal equivalent is: " << decimal << endl;
    return 0;
}

Output:

Hello Codeauri Family, Enter a binary number to find its decimal equivalent:
1010
Well,the decimal equivalent is: 10

Pro-Tips💡

This program prompts the user to enter a binary number, then uses a while loop to convert the number to decimal.

The decimal equivalent is then output to the console. The program uses the following algorithm:

  • Read the binary number from right to left (starting with the least significant digit)
  • If the digit is 1, add 2^n to the decimal where n is the position of the digit from the right.
  • If the digit is 0, don’t add anything.
  • Repeat the above steps for all digits.
  • The final decimal number is the decimal equivalent of the binary number.

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