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  1. public class Convert {
  2.  
  3. 	public static void main(String[] p) throws IOException{
  4. 		BufferedReader reader=new BufferedReader(
  5. 				new InputStreamReader(System.in));
  6.  
  7.  
  8. 		System.out.println("題目：aX2+bx+c=0,試求X=?");
  9.  
  10. 		double DblA,DblB,DblC;
  11. 		System.out.println("請輸入a=?");
  12. 		String StrUserInput = reader.readLine();
  13. 		DblA=Double.parseDouble(StrUserInput);
  14.  
  15. 		System.out.println("請輸入b=?");
  16. 		StrUserInput = reader.readLine();
  17. 		DblB=Double.parseDouble(StrUserInput);
  18.  
  19. 		System.out.println("請輸入c=?");
  20. 		StrUserInput = reader.readLine();
  21. 		DblC=Double.parseDouble(StrUserInput);
  22.  
  23. 		double DblResult=DblB*DblB-4*DblA*DblC;
  24. 		DblResult=java.lang.Math.sqrt(DblResult);
  25.  
  26. 		//DecimalFormat Formater=new DecimalFormat("0.00"); 
  27.  
  28. 		System.out.println("X = "+ (-DblB+DblResult) / (2*DblA)      );
  29.  
  30. 		System.out.println(" 或 X = "+ String.valueOf((-DblB-DblResult)/(2*DblA)));
  31.  
  32. 	}
Not running #stdin #stdout 0s 0KB
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stdin 
Standard input is empty
stdout 
Standard output is empty
https://ideone.com/OyzRg
language:
Java (12.0.1)
created:
13 years ago
visibility:
public

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