main.java

main.java

@@ -0,0 +1,108 @@
+package Hello;
+import java.io.*;
+import java.util.*;
+import java.math.*;
+public class Hello{
+	
+	public static double mypow(double e,double x) {
+		double ans=Math.pow(e, x);
+		return ans;
+	}
+	
+	public static double mylog(double a,double x) {
+		double ans=Math.log(x)/Math.log(a);
+		return ans;
+	}
+	
+	public static double myadd(double a,double b) {
+		return a+b;
+	}
+	
+	public static double mysub(double a,double b) {
+		return a-b;
+	}
+	
+	public static double mymultiply(double a,double b) {
+		return a*b;
+	}
+	
+	public  static double mydivide(double a,double b) {
+		return a/b;
+	}
+	
+	public static double mysin(double x) {
+		return Math.sin(x);
+	}
+	
+	public static double mycos(double x) {
+		return Math.cos(x);
+	}
+	
+	public  static double mytan(double x) {
+		return Math.tan(x);
+	}
+	
+	public static void main(String args[]) {
+		Scanner cin=new Scanner(System.in);
+		System.out.printf("功能表：\n说明：输入add a b执行a+b\n"
+				+ "pow e x\nlog a x\nadd a b\nsub a b\nmultiply a b\n"
+				+ "divide a b\nsin x\ncos x\ntan x\nquit:退出\n");
+		while (cin.hasNext()) {
+			String op=cin.next();
+			double a,b,ans=0;
+			switch(op) {
+				case "pow":
+					a=cin.nextDouble();
+					b=cin.nextDouble();
+					ans=mypow(a,b);
+					break;
+				case "log":
+					a=cin.nextDouble();
+					b=cin.nextDouble();
+					ans=mylog(a,b);
+					break;
+				case "add":
+					a=cin.nextDouble();
+					b=cin.nextDouble();
+					ans=myadd(a,b);
+					break;
+				case "sub":
+					a=cin.nextDouble();
+					b=cin.nextDouble();
+					ans=mysub(a,b);
+					break;
+				case "multiply":
+					a=cin.nextDouble();
+					b=cin.nextDouble();
+					ans=mymultiply(a,b);
+					break;
+				case "divide":
+					a=cin.nextDouble();
+					b=cin.nextDouble();
+					while(b==0) {
+						System.out.printf("除数不能为0，请重新输入除数!\n");
+						b=cin.nextDouble();
+					}
+					ans=mydivide(a,b);
+					break;
+				case "sin":
+					a=cin.nextDouble();
+					ans=mysin(a);
+					break;
+				case "cos":
+					a=cin.nextDouble();
+					ans=mycos(a);
+					break;
+				case "tan":
+					a=cin.nextDouble();
+					ans=mytan(a);
+					break;
+				default:
+					System.out.println("已退出计算器\n");
+					return;
+			}
+			System.out.printf("%f\n",ans);
+		}
+		cin.close();
+	}
+}