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Python Program for Binary To Decimal Conversion
Binary to Decimal Conversion
In this article we will discuss binary to decimal conversion in Python. For this purpose we need to take a binary integer number from user and convert that binary integer number to its decimal equivalent form and then print the converted number on to the screen. A Decimal number can be calculated by multiplying every digits of binary number with 2 to the power of the integers starts from 0 to n-1 where n refers as the total number of digits present in a binary number and finally add all of them.
Working :
A Decimal number can be calculated by multiplying every digits of binary number with 2 to the power of the integers
starts from 0 to n-1 where n refers as the total number of digits present in a binary number and finally add all of them.
Methods Discussed :
- Algorithmic way (Binary to Decimal)
- Inbuilt Method (Binary to Decimal)
Method 1
Algorithm :
- While num is greater then zero
- Store the unit place value of num to a variable (rem)
- Calculate rem with base and add it to answer
- Completely divide Num by 10 and multiply base with 2
Time and Space Complexities
- Time Complexity – O(N), where N is the count of the digits in the binary number
- Space Complexity – O(1), Constant Space
Python Code :
num = 10
binary_val = num
decimal_val = 0
base = 1
while num > 0:
rem = num % 10
decimal_val = decimal_val + rem * base
num = num // 10
base = base * 2
print("Binary Number is {}\nDecimal Number is {}".format(binary_val, decimal_val))
Output :
Binary Number is 10 Decimal Number is 2
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n=8
print(bin(n)[2:])
n=int(input())
ls=[]
for i in str(n):
ls.append(i)
k=len(ls)-1
g=0
i=0
while(i<len(ls)):
if(ls[i]=="1"):
g+=2**k
k-=1
i+=1
print(g)