Answered: Test Case Incomplete Grading output…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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C++ Progrmaing

Instructions

Redo Programming Exercise 6 of Chapter 8 using dynamic arrays. The instructions have been posted for your convenience.

The history teacher at your school needs help in grading a True/False test. The students’ IDs and test answers are stored in a file. The first entry in the file contains answers to the test in the form:

TFFTFFTTTTFFTFTFTFTT

Every other entry in the file is the student ID, followed by a blank, followed by the student’s responses. For example, the entry:

ABC54301 TFTFTFTT TFTFTFFTTFT

indicates that the student ID is ABC54301 and the answer to question 1 is True, the answer to question 2 is False, and so on. This student did not answer question 9 (note the empty space). The exam has 20 questions, and the class has more than 150 students. Each correct answer is awarded two points, each wrong answer gets one point deducted, and no answer gets zero points. Write a program that processes the test data. The output should be the student’s ID, followed by the answers, followed by the test score, followed by the test grade.

An example of the program is shown below:

Processing Data Key: TTFTFTTTFTFTFFTTFTTF ABC54102 T FTFTFTTTFTTFTTF TF 27 D

Remember, a space indicates that a question has been skipped. If spaces are added for formating, there are too many or too few, it may affect the accuracy of your program.

Assume the following grade scale: 90%–100%, A; 80%–89.99%, B; 70%–79.99%, C; 60%–69.99%, D; and 0%–59.99%, F.

Code I have: half of it is right but I am not getting the last two correct.

#include<iostream>

#include<fstream>

#include <string>

#define M 4 //maximum number of students

using namespace std;

int main(){

string *studentID; // array of pointers to c-strings

string *studentResult; // array of pointers to c-strings

string temp; //temporary variable

string Result; //string to hold correct result

int index;

double score=0.0;

double scale=0.0;

char grade;

int N=0; //maximum number of questions

cout<<"Enter number of exam questions: ";

cin>>N;

ifstream fin;

fin.open("Ch12_Ex2Data.txt");

if(fin.is_open()){

int i=0;

getline(fin,Result); //store first line of file in Result

studentID=new string[M+1]; //allocate memory to studentID

studentResult=new string[M+1]; //allocate memory to studentResult

for(i=0;i<M;i++){

getline(fin,temp);

index=temp.find(' ');

studentID[i]=temp.substr(0,index);

studentResult[i]=temp.substr(index+1);

}

fin.close(); //close file

cout<<endl<<"Processing Data";

cout<<endl<<"Key : "<<Result<<endl;

//calculate scores fo students

for(i=0;i<M;i++){

score=0.0; //initialize score to 0

cout<<endl<<studentID[i];

cout<<"\t"<<studentResult[i];

for(int j=0;j<N;j++){

if(studentResult[i][j]=='\n'){

studentResult[i][j]='\0';

break;

}

if(Result[j]==studentResult[i][j]) //if correct result

score=score+2; //add 2 to score

else if(studentResult[i][j]==' ' || studentResult[i][j]=='\n') //if result is blank

score=score+0; //add zero to score

else

score=score-1; //deduct 1 from score

}

cout<<"\t"<<score;

scale=(score/40)*100; //calculate scale

//calculate grades

if(scale>=90 && scale<=100) grade='A'; //90%-100%, A;

else if(scale>=80 && scale<90) grade='B'; //80%-89.99%, B;

else if(scale>=70 && scale<80) grade='C'; //70%-79.99%, C;

else if(scale>=60 && scale<70) grade='D'; //60%-69.99%, D;

else if(scale>=0 && scale<60) grade='F'; //0-59.99%, F.

cout<<"\t"<<grade;

}

cout<<endl;

}else{

cout<<"Unable to find the file 'input.txt' in the current path of program\n";

}

return 0;

}

Test Case Incomplete
Grading output
Input
20
Output
Enter number of exam questions: 20
Processing Data
Key: TTFTFTTTETETEFTTETTE
ABC54102
DEF56278
ABC42366
ABC42586
I ETETETTTETTETTE TE
TTETETTTFTFTFFTTETTE
TTETETTTETETFETTE
TTTTFTTT TETEFFTE
27
40
31
23
Results
Key TTFIFTTTFTFTFFTTFTTF ABC54102 T FIFTETTTFTTETTE TE 27 D
Expected Output
Key TTFTFTTTFTFTFFTTETTE ABC54102 T FTFTETTTFTTETTE TE 27 D

ABC42366 TTFTFTTTFTFTFFTTF 34 B ABC42586 TTTTFTTT TFTFFFTF 26 D

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