将二进制转换为十进制数 C#

Question

For my homework, I need to write a program(in C#) that will convert any binary number into decimal. I can just use /,%,+,-,*, Idk how to do that? Please help me.

Answer 1

If you want use bin as a mask , eg for bin = 1010

  1 0 1 0
x | | | |
  8 4 2 1
 --------
  8 * 1 + 4 * 0 + 2 * 1 + 1 * 0 = 10   

Code:

private static int MyConvert(int bin) {
  int result = 0;

  for (int factor = 1; bin > 0; bin /= 10, factor *= 2)
    result = result + bin % 10 * factor;
  
  return result;
}

Answer 2

Recursion can be your friend if "loops" aren't available to you:

public int BinaryToDecimal(int num) =>
    BinaryToDecimal(num, 1);

private int BinaryToDecimal(int num, int factor) =>
    num == 0 ? 0 : num % 10 * factor + BinaryToDecimal(num / 10, factor * 2);

If I run this:

Console.WriteLine(BinaryToDecimal(1001));

I get 9 , as expected.

Answer 3

Try this

public int BinaryToDecimal(int num)

 {
    int binary_num;
    int decimal_num = 0, base = 1, rem;  
    binary_num = num; // assign the binary number to the binary_num variable  
      
    while ( num > 0)  
    {  
        rem = num % 10;
        decimal_num = decimal_num + rem * base;  
        num = num / 10; // divide the number with quotient  
        base = base * 2;  
    }  
  
    return decimal_num;
 }