# How to find the product of two binary numbers using C#?

CsharpProgrammingServer Side Programming

To find the product of two binary numbers, firstly set them.

val1 = 11100;
val2 = 10001;

Console.WriteLine("Binary one: "+val1);
Console.WriteLine("Binary two: "+val2);

Now loop through to get the product.

while (val2 != 0) {
digit = val2 % 10;
if (digit == 1) {
val1 = val1 * factor;
prod = displayMul(val1, prod);
} else
val1 = val1 * factor;
val2 = val2 / 10;
factor = 10;
}
Console.WriteLine("Product = {0}", prod);

Above a method displayMul() is called with the first binary number.

static long displayMul (long val1, long val2) {
long i = 0, rem = 0, mul = 0;
long[] sum = new long;

while (val1 != 0 || val2 != 0) {
sum[i++] =(val1 % 10 + val2 % 10 + rem) % 2;
rem =(val1 % 10 + val2 % 10 + rem) / 2;
val1 = val1 / 10;
val2 = val2 / 10;
}
if (rem != 0)
sum[i++] = rem;
i = i-1;;

while (i >= 0)
mul = mul * 10 + sum[i--];
return mul;
}

Here is the complete code −

## Example

Live Demo

using System;
class Demo {
public static void Main(string[] args) {
long val1, val2, prod = 0;
long digit, factor = 1;

val1 = 11100;
val2 = 10001;

Console.WriteLine("Binary one: "+val1);
Console.WriteLine("Binary two: "+val2);

while (val2 != 0) {
digit = val2 % 10;
if (digit == 1) {
val1 = val1 * factor;
prod = displayMul(val1, prod);
} else
val1 = val1 * factor;
val2 = val2 / 10;
factor = 10;
}
Console.WriteLine("Product = {0}", prod);
}

static long displayMul (long val1, long val2) {
long i = 0, rem = 0, mul = 0;
long[] sum = new long;

while (val1 != 0 || val2 != 0) {
sum[i++] =(val1 % 10 + val2 % 10 + rem) % 2;
rem =(val1 % 10 + val2 % 10 + rem) / 2;
val1 = val1 / 10;
val2 = val2 / 10;
}
if (rem != 0)
sum[i++] = rem;
i = i-1;;

while (i >= 0)
mul = mul * 10 + sum[i--];
return mul;
}
}

## Output

Binary one: 11100
Binary two: 10001
Product = 111011100