Arrays and Strings

beavisbeast (9)
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

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#include<iostream>
#include<fstream>
#include<cstdlib>
using namespace std;

int main()
{
    ifstream finans,fintests;
    char key[21],id[12],responses[21],question[21];
    int count[20][5];
    int correct_count;
    fintests.open("Tests.dat");
    fintests>>id[12]>>responses[21];
    finans.open("Answers.dat");
    finans>>key[21];
	student_count =0;

    while(!fintests.eof())
    {
        for(int i = 0; i < student_count; i++)  
    {
        int correct_count = 0;
        for(int j = 0; j < 20; j++) 
		{
            if (responses [i][j] == key[j])
			{
                correct_count++;
            question[j][responses[i][j] - 'A']++;
        printf("%11.11s         %2d\n",id[i],correct_count);
			}

		}
    }    
        cout << " student_id      number_correct" << endl << endl;
        cout<<id[21]<<"\t"<<correct_count<<endl;
    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 == (key[k] - 'A') ? '*' : ' '));
        printf("\n");
    }
	}

    return 0;
}


these are the errors I am getting

error C2065: 'student_count' : undeclared identifier
error C2065: 'student_count' : undeclared identifier
error C2109: subscript requires array or pointer type
error C2109: subscript requires array or pointer type
error C2065: 'student_count' : undeclared identifier
error C2109: subscript requires array or pointer type
chakde (1)
Please declare student_count in your program...
There is no declaration for student_count
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