scoring Students

[thebeast91]

I need to write a program using arrays and strings.Here is the question.
A class of students takes a 20 question multiple-choice exam;each question has 5 choices(a,b,c,d,e)only one of them are correct.In "tests.dat"Each record of which consists of a student id, followed by a blank, followed by students 20 responses. In "answers.dat" which consists of a single record, namely the correct answers to the exam.Then It needs to produce a grade summary report like this.If the answer is correct it should put a "*" by the correct answer


student-id number correct
1231231212312 12
1233424325435 25
.... ...






question A B C D E
1 5 1 13* 3 1
2 4 7* 5 12 7
.
.
...



this is what i got so far.Thank you


#include <fstream>
#include <iostream>
#include <string>
#include <cstdlib>

using namespace std;
int question[20][5];
int main()
{
ifstream fanswers, fcorrect_keys;

char correct_keys[21];
char student_id[100][12], answers[100][21];
char id_buf[12], answers_buf[21];

int student_count = 0;

fcorrect_keys.open("Answers.dat");
while(!fcorrect_keys.eof()) {
fcorrect_keys >> answers_buf;
strcpy(correct_keys, answers_buf);
}
// cout << correct_keys << endl;
fcorrect_keys.close();
fanswers.open("Tests.dat");
while(!fanswers.eof()) {
fanswers >> id_buf >> answers_buf;
strcpy(student_id[student_count], id_buf);
strcpy(answers[student_count],answers_buf);
student_count++;
}
// for(int i=0; i < student_count;i++)
// cout << student_id[i] << " " << answers[i] << endl;
fanswers.close();// close the file
cout << " student_id number_correct" << endl << endl;
for(int i = 0; i < student_count; i++) {
int correct_count = 0;
for(int j = 0; j < 20; j++) {
if (answers [i][j] == correct_keys[j])
correct_count++;
question[j][answers[i][j] - 'A']++;
}
printf("%11.11s %2d\n", student_id[i],correct_count);
}
cout << endl << endl << endl << "Number of students taking exam : " << student_count << endl;

printf("\nquestion A B C D E\n");

for(int k = 0; k < 20 ; k++) {
printf(" %2d ",1+k);
for(int l=0;l < 5; l++)
printf(" %2d%c ", question[k][l], (l == (correct_keys[k] - 'A') ? '*' : ' '));
printf("\n");
}
return 0;
}

[Skizmo]

I need to write a program using arrays and strings.Here is the question.

No, that's you assignment... you didn't ask a question. Maybe you should read this first.

[thebeast91]

actually I wrote my code and I know what I did wrong only I dont know how to change it.

[GCDEF]

actually I wrote my code and I know what I did wrong only I dont know how to change it.

Why don't you tell us then so we don't have to guess.

Also, please edit your code and use code tags and proper indentation. Most of us won't even bother looking at unformatted code.

[thebeast91]

I think I am doing something wrong in the while loop

[GCDEF]

I think I am doing something wrong in the while loop

http://www.codeguru.com/forum/showpo...35&postcount=4

[hoxsiew]

Is "answers.dat" supposed to contain many lines of text? I ask because you have two variables, answers_buf and correct_keys that you read from a file, then write to the variables in a loop until the end of the file, but all this is going to give you is the very last line (you write over it with each iteration of the loop.