如何在函數調用中修復'找不到符號'？

Question

我正在用兩種不同的數據類型實現方法重載。這就是我以代碼結束的過程。 但現在它找不到符號c和d。任何幫助？

import java.util.*; 
import java.lang.*; 
public class LargestOfTwoTest{ 
    public static void main(String args[]) throws Exception{ 
     Scanner scan = new Scanner(System.in); 



     System.out.println("Enter two numbers, and I wiil show you which one's largest!\n"); 
     System.out.println("Enter two numbers: "); 
     double a = scan.nextDouble(); 
     double b = scan.nextDouble(); 

     if (a==(Math.floor(a))){ 
      int c = (int) a; 
     } 
     else{ 
      double c = a; 
     } 

     if (b==(Math.floor(b))){ 
      int d = (int) b; 
     } 
     else { 
      double d = b; 
     } 

     System.out.print("Largest of the numbers is "+largest(c,d)); 
    } 




    public static int largest(int x, int y){ 
     if (x>y) 
      return x; 
      //System.out.print("Largest of the numbers is "+x); 
     else 
      return y; 
      //System.out.print("Largest of the numbers is "+y); 
    } 
    public static double largest(double x, double y){ 
     if (x>y) 
      return x; 
      //System.out.print("Largest of the numbers is "+x); 
     else 
      return y; 
      //System.out.print("Largest of the numbers is "+y); 
    } 
} 

顯示在此行

System.out.print("Largest of the numbers is "+largest(c,d)); 

誤差..

LargestOfTwoTest.java:29：錯誤：找不到符號

（c和d）

Answer 1

import java.math.BigDecimal; 
import java.util.Scanner; 

public class LargestOfTwo { 

    private Scanner scanner; 
    private Number a; 
    private Number b; 

    public static void main(String args[]) throws Exception { 
     LargestOfTwo app = new LargestOfTwo(); 
     app.start(); 
    } 

    private void start() { 
     readInputs(); 
     Number largest = compare(a, b); 
     System.out.print("Largest of the numbers is: " + largest); 
    } 

    private void readInputs() { 
     scanner = new Scanner(System.in); 
     System.out.println("Enter two numbers, and I will show you which one is largest\n"); 
     a = readInput(); 
     b = readInput(); 
    } 

    private Number readInput() { 
     Double d = scanner.nextDouble(); 
     if (d == Math.floor(d)) { 
      return d.intValue(); 
     } else { 
      return d; 
     } 
    } 

    private Number compare(Number x, Number y) { 
     if (new BigDecimal(x.floatValue()).compareTo(new BigDecimal(y.floatValue())) > 0) { 
      return x; 
     } else { 
      return y; 
     } 
    } 
}