Javaは配列からユーザー入力を取得できません

Question

私がここで何をしようとしているのは、基本的には結果スリップを表示するJavaプログラムです。

時には、出力が正しく表示されない奇妙なエラーが発生することがあります。

import java.util.*; 
import java.text.DecimalFormat; 

public class Assignment2 
{ 
public static void main(String[] args) 
{ 
    Scanner sc = new Scanner(System.in); 

    //variable declaration 

    int totalsubjects; 
    int totalcredithour = 0; 

    double totalpointaccumulate=0; 

    String name; 
    String id; 
    String program; 

    //Decimal Formatting 
    DecimalFormat df = new DecimalFormat("#,###,##0.00"); 

    //prompt for student information 
    System.out.println("Please enter student's name: "); 
    name = sc.nextLine(); 
    System.out.println("Please enter student's ID: "); 
    id = sc.nextLine(); 
    System.out.println("Please enter student's program: "); 
    program = sc.nextLine(); 
    System.out.println("Please enter how many subjects: "); 
    totalsubjects = sc.nextInt(); 

    //arrays declaration 
    String[] code = new String[totalsubjects]; 
    int[] credithour = new int[totalsubjects]; 
    double[] courseworkMark = new double[totalsubjects]; 
    double[] finalexamMark = new double[totalsubjects]; 
    double[] gpa = new double[totalsubjects]; 
    double[] totalMarks = new double[totalsubjects]; 
    char[] grade = new char[totalsubjects]; 
    double[] point = new double[totalsubjects]; 
    double[] totalpoint = new double[totalsubjects]; 

    //loop for each subject informations 
    for(int i=0;i <code.length;i++) 
    { 
     System.out.println("Please enter subject code no "+(i+1)+":"); 
     code[i] = sc.next(); 
     System.out.println("Please enter credithour for subject no"+(i+1)+":"); 
     credithour[i]=sc.nextInt(); 
     System.out.println("Please enter the coursework mark for subject no"+(i+1)+":"); 
     courseworkMark[i] = sc.nextDouble(); 
     System.out.println("Please enter the final exam mark for subject no"+(i+1)+":"); 
     finalexamMark[i] = sc.nextDouble(); 
     totalMarks[i]=(courseworkMark[i]*0.6)+(finalexamMark[i]*0.4); 
     totalcredithour = credithour[i] + totalcredithour; 


     //Grade placement for each subject 


     if (totalMarks[i]<= 100 && totalMarks[i]>=80) 
     { 
      grade[i] = 'A'; 
      point[i] = 4.0; 
     } 

     else if (totalMarks[i]>=60 && totalMarks[i] <=79) 
     { 
      grade[i] = 'B'; 
      point[i] = 3.0; 
     } 
     else if (totalMarks[i]>=59 && totalMarks[i] <=49) 
     { 
      grade[i] = 'C'; 
      point[i] = 2.0; 
     } 
     else if (totalMarks[i]>=0 && totalMarks[i] <=40) 
     { 
      grade[i] = 'F'; 
      point[i] = 0.0; 
     } 
     totalpoint[i] = point[i] * credithour[i]; 
     totalpointaccumulate = totalpoint[i] + totalpointaccumulate; 

    } 

    System.out.println("\t -x-"); 
    System.out.println(" Result Slip Semester January 2016"); 
    System.out.println("____________________________________________"); 
    System.out.println("Name : "+name); 
    System.out.println("ID  : "+id); 
    System.out.println("Program: "+program); 
    System.out.println("____________________________________________"); 
    System.out.println("    CrHr Grade Pt TotalPt"); 
    System.out.println("--------------------------------------------"); 


    for(int k=0;k<code.length;k++) 
    { 
     System.out.println((k+1)+(".")+code[k] +("\t")+credithour[k]+("\t")+grade[k]+("\t")+point[k]+"\t"+totalpoint[k]); 

    } 

    System.out.println("--------------------------------------------"); 
    System.out.println(" Total"+"  "+totalcredithour+"      " + totalpointaccumulate); 

    System.out.println("          GPA: "+(df.format(totalpointaccumulate/totalcredithour))); 


} 

}

これは、エラーを生成する私のサンプル入力です。

Please enter student's name: 
KZK KKY 
Please enter student's ID: 
32423432 
Please enter student's program: 
BSE 
Please enter how many subjects: 
3 
Please enter subject code no 1: 
IGB4040 
Please enter credithour for subject no1: 
3 
Please enter the coursework mark for subject no1: 
70 
Please enter the final exam mark for subject no1: 
90 
Please enter subject code no 2: 
IGB3030 
Please enter credithour for subject no2: 
3 
Please enter the coursework mark for subject no2: 
50 
Please enter the final exam mark for subject no2: 
70 
Please enter subject code no 3: 
IGB2020 
Please enter credithour for subject no3: 
4 
Please enter the coursework mark for subject no3: 
60 
Please enter the final exam mark for subject no3: 
70 

The error output produced from sample input above. 第一および第3の主題がうまく働いている間、結果スリップ上の第2の主題が空である理由をここに私の質問はありますか？私のコードに論理エラーはありますか？

ありがとうございます。

Answer 1

コメントで説明したように、コードを調べた後、私はelse if (totalMarks[i]>=59 && totalMarks[i] <=49)という行を見る - これは決して真実ではない。周囲のケースが> = 60で、< = 40の場合は、この行はelse if (totalMarks[i]>=41 && totalMarks[i] <=59)

と仮定しています。私があなただったら、この修正を行い、デバッグのスキルを習得してくださいこのような小さな論理エラーを特定してください:)