Grades, Easy

#http://progzoo.net/grades10.txt #Sample data for Easy questions 1-5 #One line per student. One grade per module #Matric name RAD SD1a PS IIS # 05001001 Alpha, A 50 51 52 53 05001002 Bravo, B 40 41 42 43 05001003 Charlie, C 30 31 32 33 05001004 Delta, D 20 50 50 50 04001005 Echo, E. 50 20 50 50 04001006 Foxtrot, F 50 50 20 50 05001007 Golf, G. 50 50 50 20 05001008 Hotel, H 50 50 50 20

Each student takes four modules: RAD, SD1A, PS and IIS. The passing grade is 40% in every module.

The input data grades10.txt contains one line per student.

The line begins with the matriculation number and the name. The marks for each of the subjects are given in the sequence RAD, SD1a, PS and IIS. Each of these fields is separated by the tab character.

http://progzoo.net/grades10.txt

RAD pass list

Print the names of the students who have passed the RAD module.

Try adding an if statement, for example try replacing

 System.out.println(name);

with something like ...

if (iis<50)
 System.out.println(name);
   

.

static void oneLine(String matric, String name, int rad, int sd1a, int ps, int iis) { System.out.println(name); }

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Average grade

For each student print the name followed by the average grade over the four modules.

Help

• Print the name and a number on each line:

System.out.println(name+" "+rad);

• Calculate the average of four numbers:

int average = (rad+iis+ps+sd1a)/4;

.

static void oneLine(String matric, String name, int rad, int sd1a, int ps, int iis) { System.out.println(name); }

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Semester pass list

Print the names of the students who have passed all four modules.

You need to print some names but not other. An if statement will do this.

A sample if statement

if (rad<50)
  System.out.println(name);

Using && to test multiple conditions

if (rad<50 && iis<50)
  System.out.println(name);

.

static void oneLine(String matric, String name, int rad, int sd1a, int ps, int iis) { System.out.println(name); }

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Matric 04

Print the matriculation number and the name of the students who have a matriculation number that starts with 04.

Hint

Use the startsWith method.

.

static void oneLine(String matric, String name, int rad, int sd1a, int ps, int iis) { System.out.println(name); }

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Count SD1a fails

Print the number of students who have failed the module SD1a.

You need an accunulator to answer this question. Recall that the accumulator must be initialise before the loop and updated inside the loop.

.

import java.io.BufferedReader; import java.io.FileReader; public class Grades{ public static void main(String [] argv) throws Exception{ BufferedReader fh = new BufferedReader(new FileReader("grades10.txt")); String line; while((line=fh.readLine())!=null){ if (line.startsWith("#")) continue; String [] wrds = line.split("\t"); String matric = wrds[0]; String name = wrds[1]; int sd1a = Integer.parseInt(wrds[3]); } } }

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