Pemrograman Java NetBeans 6.5

Menentukan Index Nilai Mahasiswa

public static void main(String[] args) {
double nilai;
char index;
int tugas=Integer.valueOf(JOptionPane.showInputDialog("Input Nilai Tugas :"));
int quiz=Integer.valueOf(JOptionPane.showInputDialog("Input Nilai Quiz :"));
int uts=Integer.valueOf(JOptionPane.showInputDialog("Input Nilai Uts :"));
int uas=Integer.valueOf(JOptionPane.showInputDialog("Input Nilai Uas :"));
nilai=(tugas*0.2)+(quiz*0.1)+(uts*0.3)+(uas*0.4);
if (nilai>=80 && nilai<=100) index='A'; else if (nilai>68 && nilai<=80) index='B'; else if (nilai>55 && nilai<=68) index='c'; else if (nilai>45 && nilai<=55)
index='D';
else
index='E';
System.out.println("Nilai Tugas : "+ tugas);
System.out.println("Nilai Quiz : "+ quiz);
System.out.println("Nilai Uts : "+ uts);
System.out.println("Nilai Uas : "+ uas);
System.out.println("Index : "+ index);
}
}