<分区>
我正在玩一个幂函数的实现:
#include <iostream>
using namespace std;
int pow(int b, int e)
{
int result;
if (e == -1 && b != 0)
{
cout << "b = " << 1/b << endl;
return 1/b;
}
else if (b != 0 && e != 0)
{
//int e_int(int (e));
bool e_bool(e < 0);
e = (e_bool*-e + !e_bool*e);
result = b = pow(b, -e_bool)*(b*!e_bool + +e_bool);
cout << endl << "\"result\" = " << result << " " << e << endl;
for(int i = 1; i < e; i += 1)
{
result *= b;
}
return result;
}
else if (e != 0 && b == 0)
{
return 0;
}
else if (e == 0 && b != 0)
{
return 1;
}
else if (b == 1)
{
return 1;
}
else if (e == 1)
{
return b;
}
else
{
cout << endl << "Error";
return -1;
}
}
int main ()
{
cout << endl << pow(-2, -1);
return 0;
}
输出 is :
b = 0
0
为什么 b 被设置为 0？