// C7_1.cpp : Defines the entry point for the console application.
// 數學函數的使用 -- pow() , sqrt() , abs() , floor() , ceil() , exp() , log() , log10() 
//                   sin() , cos() , tan()

#include "stdafx.h"
#include<iostream.h>
#include<math.h>

int main(int argc, char* argv[])
{
	int choice = 0;
	cout << "*** 數學函數應用 " << endl;
    cout << "1 次方計算 " << endl;
    cout << "2 平方根計算 " << endl;
    cout << "3 絕對值計算 " << endl;
    cout << "4 floor() 和 ceil() 計算 " << endl;
    cout << "5 自然指數計算 " << endl;
	cout << "6 自然對數計算 " << endl;
	cout << "7 log10 計算   " << endl;
	cout << "8 sin() & cos() & tan() 計算 " << endl;
	cout << "請�中J 1 - 8 數字 : " ;
	cin >> choice;

	//pow() -- 次方計算
switch (choice)
{
case 1:
{
	int r1=3;
	int r2=2;
    cout << endl << endl <<  "請輸入二數值(int int) : ";
	cin >> r1 >> r2;
	cout<<"pow("<<r1<<","<<r2<<")="<<pow(r1,r2)<<endl;
	cout<<"pow("<<r2<<","<<r1<<")="<<pow(r2,r1)<<endl;
	break;
}
	//sqrt()  -- 平方根計算
case 2:
	{
	int r1=144;
	double r2=1.96;
    cout << "請輸入二數值(int double) : ";
	cin >> r1 >> r2;
	cout<<"sqrt("<<r1<<")="<<sqrt(r1)<<endl;
	cout<<"sqrt("<<r2<<")="<<sqrt(r2)<<endl;
    break;
	}
	//abs()  -- 絕對值計算
case 3:
	{
	int r1 = -88;
	float r2 = -1.69f;
    cout << "請輸入二數值(int float) : ";
	cin >> r1 >> r2;
	cout<<"abs("<<r1<<")="<<abs(r1)<<endl;
	cout<<"abs("<<r2<<")="<<fabsf(r2)<<endl;
    break;
	}
   //floor() & ceil()  -- 取得最大整數或最小整數
case 4:
	{
	double r1=-7.5;
	double r2=7.5;
    cout << endl << endl <<  "請輸入二數值(double double) : ";
	cin >> r1 >> r2;
	cout<<"floor("<<r1<<")="<<floor(r1)<<endl;
	cout<<"floor("<<r2<<")="<<floor(r2)<<endl;
	cout<<"ceil("<<r1<<")="<<ceil(r1)<<endl;
	cout<<"ceil("<<r2<<")="<<ceil(r2)<<endl;
	break;
	}
	//exp()  -- 自然指數
case 5:
	{
	int r1=1;
	float r2=2.97285f;
    cout << endl << endl <<  "請輸入二數值(int float) : ";
	cin >> r1 >> r2;
	cout<<"exp("<<r1<<")="<<exp(r1)<<endl;
	cout<<"exp("<<r2<<")="<<exp(r2)<<endl;
	break;
	}
	//log()  -- 對數
case 6:
	{
	int r1=2;
	float r2=2.88888f;
    cout << endl << endl <<  "請輸入二數值(int float) : ";
	cin >> r1 >> r2;
	cout<<"log("<<r1<<")="<<log(r1)<<endl;
	cout<<"log("<<r2<<")="<<log(r2)<<endl;
	break;
    }
	//log10()
case 7:
	{
	int r1=1000;
	int r2=10000;
    cout << endl << endl <<  "請輸入二數值(int int) : ";
	cin >> r1 >> r2;
	cout<<"log10("<<r1<<")="<<log10(r1)<<endl;
	cout<<"log10("<<r2<<")="<<log10(r2)<<endl;
	break;
    }
	//sin() & cos() & tan()
case 8:
	{
	double PI=3.1415926;
	double r1;
	double r2;
	double r3;
	double r4;
	double k1;
	double k2;
	double k3;
	double k4;
    cout << endl << endl <<  "請輸入二數值(double  double double double) : ";
	cin >> r1 >> r2 >> r3 >> r4;
	k1=((2*PI)/360)*r1;
	k2=((2*PI)/360)*r2;
	k3=((2*PI)/360)*r3;
	k4=((2*PI)/360)*r4;
	cout<<"sin(" << r1 <<") = "<<sin(k1) << endl ;
	cout<<"cos(" << r1 <<") = "<<cos(k1)<< endl;
	cout<<"tan(" << r1 <<") = "<<tan(k1)<< endl << endl;
	cout<<"sin(" << r2 <<") = "<<sin(k2)<< endl;
	cout<<"cos(" << r2 <<") = "<<cos(k2)<< endl;
	cout<<"tan(" << r2 <<") = "<<tan(k2)<< endl << endl;
	cout<<"sin(" << r3 <<") = "<<sin(k3)<< endl;
	cout<<"cos(" << r3 <<") = "<<cos(k3)<< endl;
	cout<<"tan(" << r3 <<") = "<<tan(k3)<< endl << endl;
	cout<<"sin(" << r4 <<") = "<<sin(k4)<< endl;
	cout<<"cos(" << r4 <<") = "<<cos(k4)<< endl;
	cout<<"tan(" << r4 <<") = "<<tan(k4)<< endl << endl;
break;
	}
}
	return 0;
}