USER-DEFINED METHODS - Java Programming: From Problem Analysis to Program Design - page 435

//Step 2 Open the input and output files
Scanner group1 =
new Scanner( new FileReader("group1.txt"));
Scanner group2 =
new Scanner( new FileReader("group2.txt"));

PrintWriter outfile = new PrintWriter("student.out");

avgGroup1 = 0.0; //Step 3

avgGroup2 = 0.0; //Step 4

numberOfCourses = 0; //Step 5

//print heading: Step 6
outfile.println("Course ID Group No"

+ " Course Average");

while (group1.hasNext() && group2.hasNext()) //Step 7
{

courseId1 = group1.next(); //Step 7a

7

courseId2 = group2.next(); //Step 7b

if (!courseId1.equals(courseId2)) //Step 7c

{

System.out.println("Data error: Course IDs "
+ "do not match.");
System.out.println("Program terminates.");
outfile.println("Data error: Course IDs "
+ "do not match.");
outfile.println("Program terminates.");
outfile.close();
return ;

}
else

//Step 7d

{

avg1 = calculateAverage(group1); //Step 7d.i

avg2 = calculateAverage(group2); //Step 7d.ii

printResult(outfile, courseId1,
1, avg1); //Step 7d.iii

printResult(outfile, courseId2,
2, avg2); //Step 7d.iv

avgGroup1 = avgGroup1 + avg1; //Step 7d.v

avgGroup2 = avgGroup2 + avg2; //Step 7d.vi

outfile.println();
numberOfCourses++; //Step 7d.vii

}
} //end while

if (group1.hasNext() && !group2.hasNext()) //Step 8a
System.out.println("Ran out of data for group 2 "
+ "before group 1.");