import java.util.Scanner;
/*四则运算*/
class arithmetic{
privatedouble n1;
privatedouble n2;
publicdouble getN1() {
return n1;
}
publicvoid setN1(double n1) {
this.n1 = n1;
}
publicdouble getN2() {
return n2;
}
publicvoid setN2(double n2) {
this.n2 = n2;
}
double subtration(double n1,double n2){ return n1-n2;
}
double addition(double n1,double n2){
return n1+n2;
}
double multiplication(double n1,double n2){ return n1*n2;
}
double division(double n1,double n2){
return n1/n2;
}
public arithmetic(double n1,double n2){ this.getN1();
this.getN2();
}
}
/*计算三角函数值*/
class TriFun{
privatedouble x;
publicdouble getX() {
return x;
}
publicvoid setX(double x) {
this.x = x;
}
publicvoid sin(){
System.out.println("正弦值为"+Math.sin(x));
}
publicvoid cos(){
System.out.println("余弦值为"+Math.cos(x));
}
publicvoid tan(){
System.out.println("正切值为"+Math.tan(x));
}
publicvoid asin(){
if(x>=-1&&x<=1)
System.out.println("反正弦值为"+Math.asin(x));
else
System.out.println("没有反正弦值！");
}
publicvoid acos(){
if(x>=-1&&x<=1)
System.out.println("反余弦值为"+Math.asin(x));
else
System.out.println("没有反余弦值！");
}
publicvoid atan(){
if(x!=0)
System.out.println("反正切值为"+Math.atan(x));
else
System.out.println("反正切值为PI/2="+Math.PI/2); }
public TriFun(double x){
this.x=x;
}
}
/*一元二次方程求解*/
class LinearEquation{
double a, b, c;
publicdouble getA() {
return a;
}
publicvoid setA(double a) {
this.a = a;
}
publicdouble getB() {
return b;
}
publicvoid setB(double b) {
this.b = b;
}
publicdouble getC() {
return c;
}
publicvoid setC(double c) {
this.c = c;
}
public LinearEquation(double a,double b,double c){ this.a=a;
this.b=b;
this.c=c;
}
publicvoid Answer(){
double i;
double x1 = 0;
double x2 = 0;
i = b*b-4*a*c;
if (i>= 0) {
x1 = ((-b) + Math.sqrt(i)) / 2 * a;
x2 = ((-b) - Math.sqrt(i)) / 2 * a;
System.out.println("x1="+x1);
System.out.println("x2="+x2);
}
else
System.out.println("方程没有实数解！\n");
}
}
/*一元三次方程*/
class LinEquation extends LinearEquation{
privatedouble d;
publicdouble getD() {
return d;
}
publicvoid setD(double d) {
this.d = d;
}
public LinEquation(double a, double b, double c,double d) { super(a, b, c);
this.d=d;
}
publicvoid QiuJie(){
System.out.println("x1+x2+x3 ="+(-b/a));
System.out.println("1/x1+1/x2+1/x3 ="+(-c/d));
System.out.println("x1*x2*x3 ="+(-d/a));
System.out.println("请根据上述提示自行计算！\n");
}
}
/*阶乘和m的n次方求解*/
interface factorialandPower{
long fact(double m);
long intPower(double m,double n);
}
class Calu implements factorialandPower{
double m,n;
