95 lines
2.6 KiB
Java
95 lines
2.6 KiB
Java
Double Array
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// Double-subscripted array example
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import java.awt.*;
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import javax.swing.*;
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public class DoubleArray extends JApplet
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{
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int grades[][] = { { 77, 68, 86, 73 }, { 96, 87, 89, 81 }, { 70, 90, 86, 81 } };
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int students, exams;
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String output;
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JTextArea outputArea;
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// initialize instance variables
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public void init()
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{
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students = grades.length;
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exams = grades[ 0 ].length;
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outputArea = new JTextArea();
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Container c = getContentPane();
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c.add( outputArea );
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// build the output string
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output = "The array is:\n";
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buildString();
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output += "\n\nLowest grade: " + minimum() +
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"\nHighest grade: " + maximum() + "\n";
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for ( int i = 0; i < students; i++ )
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output += "\nAverage for student " + i + " is " + average( grades[ i ] );
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outputArea.setFont( new Font( "Courier", Font.PLAIN, 12 ) );
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outputArea.setText( output );
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}
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// find the minimum grade
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public int minimum()
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{
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int lowGrade = 100;
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for ( int i = 0; i < students; i++ )
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for ( int j = 0; j < exams; j++ )
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if ( grades[ i ][ j ] < lowGrade )
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lowGrade = grades[ i ][ j ];
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return lowGrade;
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}
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// find the maximum grade
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public int maximum()
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{
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int highGrade = 0;
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for ( int i = 0; i < students; i++ )
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for ( int j = 0; j < exams; j++ )
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if ( grades[ i ][ j ] > highGrade )
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highGrade = grades[ i ][ j ];
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return highGrade;
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}
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// determine the average grade for a particular
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// student (or set of grades)
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public double average( int setOfGrades[] )
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{
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int total = 0;
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for ( int i = 0; i < setOfGrades.length; i++ )
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total += setOfGrades[ i ];
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return ( double ) total / setOfGrades.length;
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}
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// build output string
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public void buildString()
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{
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output += " "; // used to align column heads
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for ( int i = 0; i < exams; i++ )
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output += "[" + i + "] ";
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for ( int i = 0; i < students; i++ )
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{
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output += "\ngrades[" + i + "] ";
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for ( int j = 0; j < exams; j++ )
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output += grades[ i ][ j ] + " ";
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}
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}
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}
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