Q:

# Write C++ program to convert decimal number to binary using function

I have used CodeBlocks compiler for debugging purpose. But you can use any C++ programming language compiler as per your availability.

``````#include <iostream>
#include <math.h>
using namespace std;

//Function declaration
long long convertDecimalToBinary(int);

int main()
{
int n, binaryNumber;

cout << "Enter a decimal number: ";
cin >> n;
binaryNumber = convertDecimalToBinary(n);
cout << n << " in decimal = " << binaryNumber << " in binary" << endl ;
return 0;
}

long long convertDecimalToBinary(int n)
{
long long binaryNumber = 0;
int remainder, i = 1, step = 1;

while (n!=0)
{
remainder = n%2;
cout << "Step " << step++ << ": " << n << "/2, Remainder = " << remainder << ", Quotient = " << n/2 << endl;
n /= 2;
binaryNumber += remainder*i;
i *= 10;
}
return binaryNumber;
}``````

Result:

Enter a decimal number: 19

Step 1: 19/2, Remainder = 1, Quotient = 9

Step 2: 9/2, Remainder = 1, Quotient = 4

Step 3: 4/2, Remainder = 0, Quotient = 2

Step 4: 2/2, Remainder = 0, Quotient = 1

Step 5: 1/2, Remainder = 1, Quotient = 0

19 in decimal = 10011 in binary