(Solved Homework): You've been asked to write a program to grade a multiple-choice exam. The exam has 20 questions, each answered with a letter in the ran…

estu le a program to grade a multiple-choice exam. The exam has ach answered with a letter in the range of a through f .The data are xams.dat) where the first line is the key, consisting of a string of 20 the file are exam answers; each consists of a student e, and a string of 20 characters. The program should read the key, h exam, and output the ID number and score to file scores.dat. Erroneous t. Youve been asked dat st ored on a hle The remaining lines on characters. ID number, a space, strin each exam, and output the reaut should result in an error message. For example, given the data in abcdefabcdefabcdefab 1234567 abcdefabcdefabcdefab 9876543 abdde fbbbdefcbcdefac 5554446 abcdefabcdefabcdef 4445556 abcdefabcdefabcdefabcd 3332221 abcdefghijklmnopqrst the program would output the following data on scores.dat: 1234567 20 9876543 15 5554446 Too few answers 4445556 Too many answers 3332221 Invalid answers Use functional decomposition to solve the problem and code the solution using func- tions as appropriate. Be sure to use proper formatting and appropriate comments in your code. The output should be formatted neatly, and the error messages should be informative.

You’ve been asked to write a program to grade a multiple-choice exam. The exam has 20 questions, each answered with a letter in the range of ‘a’ through ‘f’. The data are stored on file (exams.dat) where the first line is the key, consisting of a string of 20 characters. The remaining lines on the file are exam answers: each consists of a student ID number, a space, and a string of 20 characters. The program should read the key, read each exam, and output the ID number and score to file scores.dat. Erroneous input should result in an error message. For example, given the data the program would output the following data on scores.dat: Use functional decomposition to solve the problem and code the solution using functions as appropriate. Be sure to use proper formatting and appropriate comments in your code. The output should be formatted neatly, and the error messages should be informative.

Expert Answer

 

#include<iostream>
#include<fstream>
#include<cstdlib>
using namespace std;
int main()
{
int ac,ch;
ifstream fin;
ofstream fout;
fin.open(“exams.dat”);
fout.open(“scores.dat”);
if (!fin)
{
cout << “Error: cannot open data file. Program aborting.n”;
exit(1);
}
char temp[29];
fin >> temp;
char key[21];
int i=0;
while(temp[i]!=’’)
{
key[i]=temp[i];
i++;
}
while(fin)
{
i=0;
char temp[29];//maximum char could be 28
char rn[8];
fin >> temp;
while(temp[i]!=’’)
{
i++;
}
if(i==7)
{
fout<<temp<<” “;
i=0;
ac=0;
ch=0;
fin>>temp;
while(temp[i]!=’’)
{
if(i<=20 && temp[i]==key[i])ac++;
if(temp[i]<‘a’ || temp[i]>’f’)ch++;
i++;
}
if(i<20 && ch==0)fout<<“too few answers”<<endl;
if(i>20 && ch==0)fout<<“too many answers”<<endl;
if(ch>0)fout<<“invalid answers”<<endl;
if(i==20)fout<<ac<<endl;
}
}
return 0;
}

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