Student Grades Using File I/O and Arrays

[leewilliam236]

I'm required to input the student id, exercises, total of the ten assignments, midterm, the final, and extra credit points. Combined, the assignments are all out of 400 points. I'm required to output all the info onto a file. But I looked at the output file and realized there was one that's very unusual. Here's the source code and output file. It didn't display 98 and said 3981e+002 without outputting the percentage.

Source Code:

#include <iostream>
#include <iomanip>
#include <fstream>
#include <cstdlib>

int asscalc(int [], int);
int calc(int, int, int, int, int);

using namespace std;

int main(){
    ifstream infile;
    ofstream outfile, outfileagain;
    const int outof = 400;
    const int ELEMENTS = 10;
    int ass[ELEMENTS], stdntid, ex, tot = 0, mi, fin, cl, pts, i, countA = 0, countB = 0, countC = 0, countD = 0, countF = 0, sign;
    double pct;
    string gr;
//Input File
    infile.open("C:\\Users\\leewi\\Desktop\\Computer Programs & Projects\\C++\\BentleyCIS22B\\CIS22BAss1\\ass1data.txt");
//Output File
    outfile.open("C:\\Users\\leewi\\Desktop\\Computer Programs & Projects\\C++\\BentleyCIS22B\\CIS22BAss1\\studentreportoutputfile.txt");
//Ignore the outfileagain manipulator for now. This is to output the quantity of As, Bs, Cs, Ds, and Fs.
    outfileagain.open("C:\\Users\\leewi\\Desktop\\Computer Programs & Projects\\C++\\BentleyCIS22B\\CIS22BAss1\\grades.txt");
    outfile << "Stdnt Id  Ex  ------- Assignments ---------  Tot  Mi  Fin  CL  Pts  Pct  Gr" << endl;
    outfile << "--------  --  -----------------------------  ---  --  ---  --  ---  ---  --" << endl;
    if(infile.fail()){
        cout << "Can't Open File";
        exit(0);
    }
        do{
            infile >> stdntid;
            if (stdntid <= 10000000){
                outfile << 0;
            }
            infile >> ex;
            for(i = 0; i < 10; i++){
                infile >> ass[i];
            }
            infile >> mi;
            infile >> fin;
            infile >> cl;
            outfile << stdntid << setw(4) << ex << setw(4);
            for (i = 0; i < 10; i++){
                outfile << ass[i] << setw(3);
            }
            tot = asscalc(ass, i);
            pts = calc(ex, tot, mi, fin, cl);
            pct = (static_cast<double>(pts)/outof) * 100;
            sign = static_cast<int>(pct) % 10;
            if (pct >= 90){
                gr = "A";
                countA++;
            }
            else if (pct >= 80){
                gr = "B";
                countB++;
            }
            else if (pct >= 70){
                gr = "C";
                countC++;
            }
            else if (pct >= 60){
                gr = "D";
                countD++;
            }
            else{
                gr = "F";
                countF++;
            }
            outfile << setw(5) << tot << setw(4) << mi << setw(5) << fin << setw(4) << cl << setw(5) << pts << setw(5) << setprecision(2) << pct << setw(4) << gr;
            if (sign <= 1){
                outfile << "-" << endl;
            }
            else if (sign >= 9){
                outfile << "+" << endl;
            }
            else{
                outfile << endl;
            }
        }while(!infile.eof());

        cout << "Check Student Report on student \"reportoutputfile.txt\" & Grades on \"grades.txt\"" << endl;

            outfileagain << "Number of A's = " << countA << endl;
            outfileagain << "Number of B's = " << countB << endl;
            outfileagain << "Number of C's = " << countC << endl;
            outfileagain << "Number of D's = " << countD << endl;
            outfileagain << "Number of F's = " << countF << endl;

        infile.close();
        outfile.close();
        outfileagain.close();

return 0;
}

int calc(int ex, int tot, int mi, int fin, int cl){

    int pts;
    pts = ex + tot + mi + fin + cl;
    return pts;

}

int asscalc(int ass[], int i){
    int tot = 0;

    int startScan, minIndex, hold;

    const int ELEMENTS = 10;

   for (startScan = 0; startScan < (ELEMENTS - 1); startScan++)
   {
      // find index of the largest value
      minIndex = startScan;
      for(int index = startScan + 1; index < ELEMENTS; index++)
      {
         if (ass[index] > ass[minIndex])
         {
            minIndex = index;
         }
      }
      // swap
      hold = ass[minIndex];
      ass[minIndex] = ass[startScan];
      ass[startScan] = hold;
   }

    for(i = 0; i < 9; i++){
        tot += ass[i];
    }

return tot;
}

Output File:

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52

Stdnt Id Ex

-------- -- ----------------------------- --- -- --- -- --- --- -- 77997913 38 19 16 16 16 20 20 16 20 16 16 159 56 60 3 316 79 C+ 87969978 30 20 11 14 19 11 13 14 8 19 10 131 60 77 7 305 76 C 81564051 21 14 12 11 18 9 17 11 15 9 20 127 76 90 6 320 80 B- 25744204 37 18 16 19 14 16 13 16 15 17 20 151 68 74 8 338 84 B 53057551 24 9 12 15 10 15 11 20 16 17 20 136 22 62 8 252 63 D 49778442 31 9 8 6 7 20 10 16 7 16 5 99 79 45 10 264 66 D 01234567 17 19 18 15 19 14 14 17 15 16 20 153 37 65 5 277 69 D+ 34664035 38 20 7 15 20 17 15 16 16 16 5 142 34 83 9 306 76 C 50077769 28 10 20 13 17 20 13 18 19 11 18 149 55 99 6 337 84 B 94439268 39 17 18 17 17 7 19 10 20 18 14 150 77 82 5 353 88 B 75809789 16 17 6 9 16 8 10 17 19 15 19 130 60 68 7 281 70 C- 93888835 21 19 20 7 16 18 19 14 8 14 18 146 55 83 9 314 78 C 77126205 29 18 16 18 19 15 16 18 20 20 19 164 51 53 10 307 77 C 95209093 24 16 18 12 16 18 19 10 16 20 7 145 78 74 5 326 82 B- 82409983 34 13 18 19 5 10 16 6 7 19 16 124 22 42 1 223 56 F 99219262 28 19 17 18 15 7 4 14 18 16 18 142 25 88 8 291 73 C 45809717 32 19 14 14 20 20 19 18 17 14 17 158 50 55 10 305 76 C 90299943 28 20 16 13 15 1 14 12 12 5 16 123 47 77 7 282 70 C- 76629944 26 5 20 20 14 18 16 11 5 19 12 135 77 92 8 338 84 B 49944436 35 13 20 13 12 17 16 16 18 18 6 143 50 68 5 301 75 C 91396740 40 17 19 9 15 20 16 12 18 15 20 152 27 98 4 321 80 B- 99926844 16 17 20 7 2 16 4 16 14 11 17 122 58 83 4 283 71 C- 83582695 39 17 20 19 20 14 20 19 13 18 17 164 34 63 7 307 77 C 86575634 30 18 17 14 19 9 13 16 9 18 17 141 78 61 10 320 80 B- 74536060 24 18 15 18 16 12 14 13 16 11 17 139 76 30 8 277 69 D+ 75927432 19 17 17 16 15 18 15 12 5 17 10 137 74 72 10 312 78 C 96618874 27 6 14 14 19 15 20 20 20 14 20 156 77 98 9 367 92 A- 82679771 34 11 10 19 17 20 14 16 18 4 15 140 55 52 6 287 72 C- 47715766 37 20 19 9 19 15 16 16 7 19 18 151 62 95 10 355 89 B 84855076 38 20 15 17 16 11 6 19 20 20 15 153 60 94 8 353 88 B 91767175 34 16 11 18 14 18 19 11 16 14 20 146 69 47 5 301 75 C 77637878 30 17 16 20 11 15 18 13 8 19 8 137 66 71 7 311 78 C 54945864 16 11 9 15 11 13 17 16 8 8 19 119 61 66 9 271 68 D 62946127 22 19 14 19 20 20 19 20 20 20 14 171 63 97 8 361 90 A- 91659955 39 18 5 18 13 19 18 10 20 13 17 146 76 79 10 350 88 B 31904387 26 16 14 10 19 7 11 13 18 15 10 126 44 40 7 243 61 D- 97467762 34 13 20 16 14 18 13 19 16 11 18 147 80 81 10 352 88 B 87623194 40 15 17 16 18 19 18 19 19 17 6 158 57 71 8 334 84 B 91644504 29 13 14 9 19 15 20 20 18 12 17 148 75 72 8 332 83 B 92199190 39 20 4 10 6 14 14 17 14 19 15 129 78 31 9 286 72 C- 62413521 17 18 20 17 15 8 12 17 13 15 19 146 67 90 7 327 82 B- 81169639 35 20 17 17 15 19 17 11 13 17 16 151 66 96 7 355 89 B 77899606 10 16 11 15 12 17 16 12 11 3 10 120 78 44 10 262 66 D 29469155 36 19 17 19 14 18 16 8 16 16 5 143 68 68 1 316 79 C+ 54394937 32 19 20 16 11 19 19 17 13 14 10 148 78 93 8 359 90 B+ 98139730 37 19 10 11 20 17 17 20 16 9 18 148 60 79 8 332 83 B 76543210 29 3 10 10 10 15 10 15 10 15 10 105 50 71 0 255 64 D 76543211 19 0 15 10 10 15 10 15 10 15 10 110 50 70 0 249 62 D 87654321 37 20 19 20 19 20 19 20 19 20 19 176 78 98 9 3981e+002 A+ 97526730 34 6 13 20 17 20 13 17 19 7 9 135 79 87 8 343 86 B 97526730 34 20 20 19 17 17 13 13 9 7 6 135 79 87 8 343 86 B

[ne555]

> Here's the source code and output file
¿where's the input file?
¿how do you expect us to run your program? (¿how do you expect us to analyse it without run it?)

> Ignore the outfileagain manipulator for now. This is to output the quantity of As, Bs, Cs, Ds, and Fs.
it's your job to remove all the irrelevant bits. (that may also help you to identify the relevant parts)

> do{/*...*/} while(not in.eof());
get pen and paper, follow your code and realise that that stops too late (as you may see in the output file, the last line is duplicated)
use while(infile >> stdntid){/*...*/} instead

> int asscalc(int ass[], int i){
¿what does `i' represent? ¿and why you overwrite it on line 130?

> ass[ELEMENTS], stdntid, ex, tot = 0, mi, fin, cl, pts, i
¿do they charge you by letter?

> said 3981e+002 without outputting the percentage.
read that as 398 1e+002