ex4_2.cpp

纯粹是学习专用～

#include <iostream.h>
#include<math.h>
float power(float x,int n){					//求x的n次幂
	float pow=1;
	while(n--)
		pow*=x;
	return pow;
}
void main(){
	int n=3;
	float x=4.6;
	char c='a';
	cout<<"power ("<<x<<','<<n<<")="<<power(x,n)<<endl;
	cout<<"power ("<<c<<','<<n<<")="<<power(c,n)<<endl;		//c取ASCII码97
	cout<<"power ("<<n<<','<<x<<")="<<power(n,x)<<endl;		//x截尾取整
}