Convert to Decimal

Wrtie a function that gets a number (containing only 1’s and 0’s) and returns its decimal representation. You can assume validity of the input.

For example:

INPUT  : 101
OUTPUT : 5

int toDecimal(int num)

int toDecimal(int num) {
	int digit;
	int toDecimal = 0;
	int base = 1;
	while (num > 0) {
		digit = num % 10;
		toDecimal = toDecimal + base * digit;
		base *= 2;
		num = num / 10;
	}
	return toDecimal;
}

INPUT  : 1001
OUTPUT : 9

INPUT  : 1111
OUTPUT : 5

INPUT  : 1100
OUTPUT : 12

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