\Java

StudentGrades.java

//******************************************************************** // // StudentGrades.java // Program Title: Student Grade File Processing // //******************************************************************** // // Program Description: // ------------------- // // This is a program that updates a student's cumulative grade data after new grades // for the most recent quarter have been recorded and prints out the new updated results and // the results for the information on the most recently completed quarter // // // Input Requirements: // ------------------ // // A text file contains grade data for many students. Data for each student is stored on // three lines of the file. This is called a record. There may be any number of records in // a file, including zero. Data values on each line are separated from each other by white // space. However, the Student Name field may contain embedded blanks. The description of // the data fields in a record for one student is: // // First Line: Student identification data // 1. Student ID#: student's ID #: 9 decimal digits (with no dashes between the digits) // 2. Student name: student's last name, first name, and initial(s): // There will be blank spaces within the name separating each part of the name. The // number of parts of a name can be different for each student (some names may be 1 or 2 // words and others as many as 4 or 5 words). // // Second Line: Cumulative grade data // 1. Cumulative number of quarters completed: the number of quarters the student has // completed to date (not including the current quarter): an integer in the range 0-40 // 2. Cumulative credits: the number of credits the student has completed to date (not // including the current quarter): an integer in the range 0-300 // 3. Overall GPA: the student's grade point average to date (not including the current // quarter): a floating point number in the range 0.00-4.00 with two decimal places // // Third Line: Current quarter grade data // 1. Count of courses taken in the current quarter: // an integer between 2 and 6 (each student may have a different count) // 2. Credit and grade data for each course (same number of credits and grades as the // count value): // This data appears in the order: # credits 1st course, grade for 1st course, # credits // 2nd course, grade for 2nd course, ... // Each credit value is an integer in the range 2-5 and each grade value is a floating // point number in the range 0.0 to 4.0. // // Last Line: // 1. The end of the input data is signaled by a sentinel value of zero as a student ID#. // There is no other data after the zero. // // // Output Requirements: // ------------------- // // The output includes three lines of text for each student. The output for each student is: // // First Line: Student identification data -- same as the input // 1. Student ID# // 2. Student name // // Second Line: Cumulative grade data -- same as the input except quarters completed, credit // units, and GPA are the new updated values. // 1. Cumulative number of quarters completed // 2. Cumulative credits // 3. Overall GPA // // Third Line: Current quarter grade data // 1. Count of courses current quarter (same as input file) // 2. Total credits current quarter: an integer // 3. Quality points current quarter: a floating point number with one decimal place // 4. GPA current quarter: a floating point number with two decimal places // 5. Letter grade current quarter: a single character, A, B, C, D, or F // (no + and - grades are computed in this program) // // Last Line: // The end of the output is signaled by a sentinel value of zero as a student ID#. There // is no other output after the zero // // Problem Solution Discussion: // --------------------------- // // This Program first reads the value of the ID number. if it is not equal to zero, it // enters the loop. Then, it inputs the name of sudent, cumulative number of quarters, // cumulative number of credits, overall GPA prior to this quarter, and number of courses in // this quarter. It then runs another loop for the amount of times as the number of courses // the student is taking. In the loop, it inputs the amount of credits and grade for each // course taken in the quarter and takes the sum of each. To get the quality points for the // current quarter, the product of the grade and number of credits of each course are all // summed up. the total credits taken that quarter is also the sum of the credits of each // course. exit loop. To get the quality points for the prior quarters, we multiply the // cumulative number of credits prior to this quarter with the GPA prior to this quarter. // Then to get the average GPA for this quarter, the quality points of the quarter is divided // by the total credits taken this quarter. The cumulative number of quarters is incremented // by one. The new cumulative credits is the cumulative credits before this quarter plus the // total credits taken this quarter. the new overall GPA is the sum of the quality points // prior to this quarter and the quality points of this quarter all divided by the cumulative // amount of credits. The letter grade for the quarter is derived by the following: // if GPA current quarter >= 3.67, then A // if current quarter GPA < 3.67 and >= 3.0, then B // if current quarter GPA < 3.0 and >= 2.0, then C // if current quarter GPA < 2.0 and >= 1.0, then D // if current quarter GPA < 1.0, then F // exit loop. // // Data Structures: // --------------- // // Name Data Type Description // --------- --------- ----------------------------- // IDNum, integer student ID number // cumQuarters integer cumulative number of quarters completed // cumCredits integer cumulative number of credits completed // curNumCourses integer number of courses in current quarter // curCredits integer number of credits in course in current quarter // curTotCredits integer total number of credits in current quarter // count integer used to define amount of times to run loop // oldGPA float overall GPA prior to current quarter // curGrade float grade in specific course taken this quarter // curGPA float GPA of current quarter // curQualPts float quality points in current quarter // oldQualPts float quality points prior to current quarter // newGPA float overall GPA after current quarter // name String student name // letterGrade String average letter grade for current quarter // // // Problem Solution Design Steps: // ----------------------------- // //input IDnum (priming read) //run loop while IDnum not equal to zero (sentinel) // enter loop // // input name // input cumQuarters // input cumCredits // input oldGPA // input curNumCourses // set count equal to curNumCourses // run loop while count > 0 // // enter loop // input curCredits // input curGrade // set curQualPts equal to curQualPts + {curCredits * curGrade) // set curTotCredits equal to curTotCredits + curCredits // reduce count by increment of 1 // exit loop // // set oldQualPts equal to (cumCredits * oldGPA) // set curGPA equal to (curQualPts / curTotCredits) // cumQuarters up by 1 // set cumCredits equal to (cumCredits + curTotCredits) // set newGPA equal to ((oldQualPts + curQualPts) / cumCredits) // // if curGPA >= 3.67, then letterGrade = A // if curGPA < 3.67 and >= 3.0, then letterGrade = B // if curGPA < 3.0 and >= 2.0, then letterGrade = C // if curGPA < 2.0 and >= 1.0, then letterGrade = D // if curGPA < 1.0, then letterGrade = F // // print IDNum and name on same line // print cumQuarters, cumCredits, and newGPA (extended to 2 decimal places) on same line // print curNumCourses, curCredits, curQualPts (extended to one decimal place), // curGPA(extended to 2 decimal places), and letterGrade on same line // input IDNum // // exit loop // //print 0 // //end //******************************************************************** import cs1.Keyboard; //textbook's Keyboard input class import java.text.DecimalFormat; //class to extend number out to # decimal places public class StudentGrades { //----------------------------------------------------------------- // The class main method //----------------------------------------------------------------- public static void main (String[] args) { int IDNum, //student ID number cumQuarters, //cumulative number of quarters completed cumCredits, //cumulative number of credits completed curNumCourses, //number of courses in current quarter curCredits=0, //number of credits in course in current quarter curTotCredits, //total number of credits in current quarter count; //used to define amount of times to run loop float oldGPA, //overall GPA prior to current quarter curGrade, //grade in specific course taken this quarter curGPA, //GPA of current quarter curQualPts, //quality points in current quarter oldQualPts, //quality points prior to current quarter newGPA; //overall GPA after current quarter String name, //student name letterGrade = ""; //average letter grade for current quarter DecimalFormat fmtGPA = new DecimalFormat ("0.00"); DecimalFormat fmtPts = new DecimalFormat ("#.0"); //input IDnum (priming read) IDNum = Keyboard.readInt(); //run loop while IDnum not equal to zero (sentinel) while (IDNum != 0) { //initialize all necessary values to zero so program doesnt include prior student's stats as well cumQuarters = 0; cumCredits = 0; curNumCourses = 0; curTotCredits = 0; oldGPA = 0; curGrade = 0; curQualPts = 0; oldQualPts = 0; newGPA = 0; letterGrade = ""; //input name name = Keyboard.readString(); //input cumQuarters cumQuarters = Keyboard.readInt(); //input cumCredits cumCredits = Keyboard.readInt(); //input oldGPA oldGPA = Keyboard.readFloat(); //input curNumCourses curNumCourses = Keyboard.readInt(); //set count equal to curNumCourses //run loop while count > 0 //reduce count by increment of 1 for (count=curNumCourses; count > 0; count--) { //input curCredits curCredits = Keyboard.readInt(); //input curGrade curGrade = Keyboard.readFloat(); //set curQualPts equal to curQualPts + (curCredits * curGrade) curQualPts += (curCredits * curGrade); //set curTotCredits equal to curTotCredits + curCredits curTotCredits += curCredits; } //set oldQualPts equal to (cumCredits * oldGPA) oldQualPts = (cumCredits * oldGPA); //set curGPA equal to (curQualPts / curTotCredits) curGPA = (curQualPts / curTotCredits); //cumQuarters up by 1 cumQuarters ++; //set cumCredits equal to (cumCredits + curTotCredits) cumCredits += curTotCredits; //set newGPA equal to ((oldQualPts + curQualPts) / cumCredits) newGPA = ((oldQualPts + curQualPts) / cumCredits); //if curGPA >= 3.67, then letterGrade = A if (curGPA >= 3.67) letterGrade = "A" ; //if curGPA < 3.67 and >= 3.0, then letterGrade = B else if (curGPA < 3.67 && curGPA >= 3.0) letterGrade = "B" ; //if curGPA < 3.0 and >= 2.0, then letterGrade = C else if (curGPA < 3.0 && curGPA >= 2.0) letterGrade = "C"; //if curGPA < 2.0 and >= 1.0, then letterGrade = D else if (curGPA < 2.0 && curGPA >= 1.0) letterGrade = "D" ; //if curGPA < 1.0, then letterGrade = F else if (curGPA < 1.0) letterGrade = "F"; //print IDNum and name on same line System.out.println (IDNum + " " + name); //print cumQuarters, cumCredits, and newGPA (extended to 2 decimal places) on same line System.out.println (cumQuarters + " " + cumCredits + " " + fmtGPA.format(newGPA)); //print curNumCourses, curTotCredits, curQualPts (extended to one decimal place), curGPA(extended to 2 decimal places), and letterGrade on same line System.out.println (curNumCourses + " " + curTotCredits + " " + fmtPts.format(curQualPts) + " " + fmtGPA.format(curGPA) + " " + letterGrade); //input IDNum IDNum = Keyboard.readInt(); } //print 0 System.out.println (0); } //end main } // end class StudentGrades

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