3_2.cpp

来自「清华大学出版社出版的c++程序设计课本」· C++ 代码 · 共 30 行

#include <iostream.h>

double power (double x, int n);

void main(void)
{
	int	i;
	int	value = 0;
	char	ch;
	
	cout << "Enter an 8 bit binary number  ";
	for (i = 7; i >= 0; i--)
	{
		cin >> ch;
		if (ch == '1')
			value += int(power(2,i));
	}
	cout <<"Decimal value is  "<<value<<endl;
}

double power (double x, int n)
{
	double val = 1.0;
	
	while (n--)
		val *= x;
	return(val);
}