you\'ve been asked to write a program to grade a multiple-choiceexam. the exam h

Question

you've been asked to write a program to grade a multiple-choiceexam. the exam has 20 questions, each answered with a letter in therange of 'a' through 'f'. the data are stored on a file (exams.dat)where the first line is the key, consisting of a string of 20characters the remaining lines on the file are exam answers, andconsist of a student ID number, a space and a string of 20characters. the program should read the key, then read each examand output the ID number and score to file scores.dat. erroneousinput should result in an error message. For example, given thedata:

abcdefabcdefabcdefab

1234567           abcdefabcdefabcdefab

9876543           abddefbbbefcbcdefac

5554446           abcdefabcdefabcdef

4445556           abcdefabcdefabcdefabcd

3332221           abcdefghijklmnopqrst

The program would output on scores.dat

1234567           20

9876543           15

5554446           Too few answers

4445556           Too many answers

333221           Invalid answers

Use functional decomposition to solve the problem and code thesolution using functions as appropriate. Be sure to use properformatting and appropriate comments in your code. The output shouldbe neatly formatted, an the error messages should beinformative.

please help. thank you inadvance. i need it by sunday. thanks.

Explanation / Answer

please rate - thanks #include #include #include using namespace std; void gradetest(ifstream&,ofstream&,string,int,int); void printgrade(int,int,int,ofstream&); int main() {string answer; int id,max=20; ifstream input; ofstream output; input.open("exams.dat");          //open file if(input.fail())            //is it ok?     { coutid;    } input.close(); output.close(); system("pause"); return 0; } void gradetest(ifstream& in,ofstream& out,string right,intid,int max) {int count=0,printcode=0,i=0,j; string ans; in>>ans; while(ans[i]!='')     {if(i>=max)         {printgrade(id,0,1,out);          return;         }             if(ans[i]'f')        {printgrade(id,0,2,out);          return;         }         if(ans[i]==right[i])           count++;      i++;      } if(i

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