Binary to decimal conversion using Java
Binary to decimal conversion
In number system, Binary number uses only two digits of 0, 1 which has base 2. Whereas Decimal Number uses only 10 Symbols: 0, 1, 2, 3, 4, 5, 6, 7 , 8 and 9 which has base 10.
100101 in base 2(Binary) => 37 in Base 10 (Decimal)
Step 1 : Ask the user to enter a binary number.
Step 2 : Declare two variables, one for storing decimal value and second for storing value of the power.
Step 3 : Use the while loop till binary number entered by user is greater than 0.
Step 4 : Use a statement to get the last digit of the binary number.
Step 5 : Use the statement for adding each digit by multiplying by the power of 2 and power starts with 0 till p-1 (where p is the number of digits in the binary number) by using power function.
Step 6 : Use the statement for removing last digit of the binary number and taking only remaining number and increase the value of the power by 1.
Step 7 : Repeat the steps 3 to 6 till the value of the loop does not gets false.
Step 8 : Print the result.
Code in for Binary to decimal conversion using java:
//Java program to convert Binary number to decimal number
public class Binary_To_Decimal
public static void main(String args)
Scanner sc = new Scanner(System.in);
System.out.print("Enter a binary number : ");
int binary = sc.nextInt();
//Declaring variable to store decimal number
int decimal = 0;
//Declaring variable to use in power
int n = 0;
//writing logic for the conversion
while(binary > 0)
int temp = binary%10;
decimal += temp*Math.pow(2, n);
binary = binary/10;
System.out.println("Decimal number : "+decimal);
//closing scanner class(not compulsory, but good practice)
Enter a binary number : 111001
Decimal number : 57
Time and Space Complexities
Time Complexity – O(K), where K is the count of the digits in the binary number
Space Complexity – O(1)