A binary number into a corresponding decimal number.

Topic Description:
Enter a binary number, ending with a carriage return. The binary number is a positive number, length is not more than 31.

			输出
			输出一个整数，为该二进制数对应的十进制数。
			
			样例输入 Copy
			100000000001
			样例输出 Copy
			2049

# include<stdio.h>
int main()
{
	int n=0;
	char m;
	while((m=getchar())!='\n')
	{
		n=n*2+(m-'0');
	}
	printf("%d",n);
	return 0;
}

Note: m as a character instead of a number, m should subtract 0 corresponding ascii code will correspond.