n=10
array=[]

def decimalToBinary(N):
    string = ""
    while(N>0):
        a=int(N%2)
        array.append(a)
        N = N//2
        
    for i in range(0,len(array)):
        string += str(array[i])
        
    print(string[::-1])

decimalToBinary(n)

1010