binary to decimal

1import java.util.Scanner;
2public class BinaryToDecimalDemo 
3{
4   public static void main(String[] args) 
5   {
6      int number, decimal = 0, a = 0;
7      Scanner sc = new Scanner(System.in);
8      System.out.println("Please enter binary number: ");
9      String strBinary = sc.nextLine();
10      number = Integer.parseInt(strBinary);
11      while(number != 0){
12         decimal += (number % 10) * Math.pow(2, a);
13         number = number / 10;
14         a++;
15      }
16      System.out.println("Decimal number: " + decimal);
17      sc.close();
18   }
19}

1#include <math.h>
2#include <stdio.h>
3int convert(long long n);
4int main() {
5    long long n;
6    printf("Enter a binary number: ");
7    scanf("%lld", &n);
8    printf("%lld in binary = %d in decimal", n, convert(n));
9    return 0;
10}
11
12int convert(long long n) {
13    int dec = 0, i = 0, rem;
14    while (n != 0) {
15        rem = n % 10;
16        n /= 10;
17        dec += rem * pow(2, i);
18        ++i;
19    }
20    return dec;
21}
22

1double binaryToDecimal(char binary[DIM]) {
2	char binary2[DIM] = "", floa[DIM] = "";
3	double decimal = 0, negDec = 0, flo = 0;
4	int count = 0, j = 0, i = 0, f = 0, g = 0, h = 0, count1 = 0, d = 0, k = 0;
5	while (binary[d] != '\0'&&binary[d] != '.') { d++; }
6	d--;
7	if (binary[0] == '-') {
8		while (binary[k] != '\0') {
9			binary[k] = binary[k + 1];
10			k++;
11		}
12		k = 0;
13		while (binary[k] == '0') {
14			d--;
15			k++;
16		}
17		negDec = pot(2.000, d*1.000, 1);
18	}
19	while (binary[i] != '\0'&&binary[i] != '.') {
20		i++;
21	}
22	i--;
23	count = i;
24	h = i;
25	while (binary[h] != '\0') {
26		floa[g] = binary[h + 2];
27		g++;
28		h++;
29	}
30	g--;
31	count1 = g;
32	while (i >= 0) {
33		binary2[j] = binary[i];
34		i--;
35		j++;
36	}
37	binary2[j] = '\0';
38	while (i <= count) {
39		if (binary2[i] == '1') {
40			decimal = decimal + pot(2.000, i, 1);
41		}
42		i++;
43	}
44	h = -1;
45	g = 0;
46	while (g <= count1) {
47		if (floa[g] == '1') {
48			flo = flo + pot(2.000, h, 1);
49		}
50		g++;
51		h--;
52	}
53	decimal = decimal + flo;
54	if (negDec > 0) {
55		decimal = (decimal - negDec);
56		if (flo > 0) {
57			double f = fl(decimal);
58			f = 1 - f;
59			decimal = returnDeciPart(decimal) - f;
60		}
61	}
62	return decimal;
63}

1binary 10 = 2 denary

1import java.util.Scanner;
2
3public class BinaryToDecimal {
4
5	public static void main(String[] args) {
6		// TODO Auto-generated method stub
7		Scanner sc = new Scanner(System.in);
8		String binary = sc.next();
9		// This is one line solution for binary to decimal in java
10		System.out.println(Integer.parseInt(binary,2));
11		
12		//This solution is based on formula for binary to decimal conversion
13		int n=0,dec=0;
14		for(int i=binary.length()-1;i>=0;i--)
15		{
16			dec = dec + Integer.parseInt(String.valueOf(binary.charAt(i)))*(int)Math.pow(2,n);
17			n++;
18		}
19		System.out.println(dec);
20
21	}
22
23}
24