Small problem with this array...

I'm trying to establish for each student from a data file an average, their lowest and maximum grades. The problem comes when I add in the portion with a back slash next to it. Not only does it not input the values but it completely messes up the array. Any ideas? Am I just mis-placing my code?

Code:

#define GRADES 5
#define STUDENTS 10
#define <stdio.h>

int main() {
/* grade[0][0] is student 0 quiz 0 */
/* grade[0][1] is student 0 quiz 1 */
int qi = 0, si = 0, grade[STUDENTS][GRADES], mins = 9999, maxs = 0, avgs = 0
, sums = 0, minq = 9999, maxq = 0, sumq = 0, avgq = 0 ;

while (si < STUDENTS) {
    qi = 0 ;
    while (qi < GRADES) {
        if (scanf("%d",&grade[si][qi]) == EOF)
//           avgs = sums / GRADES;
//            printf("Student #%d stats: high %d, low %d, avg %d. \n", si, maxs, mins, avgs);
            break;
            
    //    else if (grade[si][qi] < mins)
    //        mins = grade[si][qi];
    //    else if(grade[si][qi] > maxs)
    //        maxs = grade[si][qi];
    //   sums += grade[si][qi];
        qi++;
    }
    si++;
}
for (si = 0; si < STUDENTS ; si++){
    printf("Student #%2d: ",si);
    for (qi = 0; qi < GRADES; qi++)
        printf("%6d ",grade[si][qi]);
    printf("\n");
}

return 0;
}

Here is the input file.

64
251
680
221
892
122
242
109
566
743
364
455
148
167
138
413
456
149
0
245
422
268
184
110
433
221
222
0
347
182
205
485
116
200
206
184
332
286
122
206
194
286
335
341
146
228
248
992
620
283
2
8


Edit: Put in the backslash modifiers.

What part with the backslash next to it?

Code:

       if (scanf("%d",&grade[si][qi]) == EOF)
//           avgs = sums / GRADES;
//            printf("Student #%d stats: high %d, low %d, avg %d. \n", si, maxs, mins, avgs);
            break;

You weren't trying to make indentation play the role of curly braces, were you?

I tried braces on that portion but all it does is print the array and none of the results I need.

Well, consider your algorithm:

Code:

FOR EACH student
    READ IN a bunch of grades
    CALCULATE some averages

Note that (1) no EOF is checking is involved (if your data file ends in the middle of a student, there's nothing you can do about it anyway); (2) averages are calculated anyway without relying on EOF to happen.

Ah, I see what you mean. It reads the first set of numbers I want and even prints them. I just need a reliable way to print them off before I reset them. New code is

Code:

#define GRADES 5
#define STUDENTS 10

#include <stdio.h>

int main() {
/* grade[0][0] is student 0 quiz 0 */
/* grade[0][1] is student 0 quiz 1 */
int qi = 0, si = 0, grade[STUDENTS][GRADES], mins = 9999, maxs = 0, avgs = 0
, sums = 0, minq = 9999, maxq = 0, sumq = 0, avgq = 0 ;

while (si < STUDENTS) {
    qi = 0 ;
    while (qi < GRADES) {
        if (scanf("%d",&grade[si][qi]) == EOF)
            break;
        else if (grade[si][qi] < mins)
            mins = grade[si][qi];
        else if(grade[si][qi] > maxs)
            maxs = grade[si][qi];
        sums += grade[si][qi];
        avgs = sums / GRADES;
        qi++;
    }
    si++;
}
for (si = 0; si < STUDENTS ; si++){
    printf("Student #%2d: ",si);
    for (qi = 0; qi < GRADES; qi++)
        printf("%6d ",grade[si][qi]);
    printf("\n");
    printf("Student #%d stats: high %d, low %d, avg %d. \n", si, maxs, mins,
 avgs);
}

return 0;
}

Well, I got the student portion set but now it says there is a parse error before the quiz portion on line 28.

Code:

#define GRADES 5
#define STUDENTS 10

#include <stdio.h>

int main() {
/* grade[0][0] is student 0 quiz 0 */
/* grade[0][1] is student 0 quiz 1 */
int qi = 0, si = 0, grade[STUDENTS][GRADES], smax, smin, ssum, savg;
int qmax, qmin, qsum, qavg;

while (si < STUDENTS) {
    qi = 0 ;
    while (qi < GRADES) {
        if (scanf("%d",&grade[si][qi]) == EOF) break;
        qi++;
    }
    si++;
}

for (qi = 0; qi < GRADES; qi++)
    {
       qmax = 0;
    qmin = 9999;
    qsum = 0;
    for(si = 0; si < STUDENTS; si++){
        if (grade[si][qi > qmax)
            qmax = grade[si][qi];
        if (grade[si][qi] < qmin)
            qmin = grade[si][qi];
        qsum += grade[si][qi];
        }
    qavg = qsum / STUDENTS;
    printf("Quiz #%d stats: low %d, high %d, avg %d.\n", qi, qmin, qmax, qavg);
    }

for (si = 0; si < STUDENTS; si++){
    smax = 0;
    smin = 9999;
    ssum = 0;
    for (qi = 0; qi < GRADES; qi++){
        if (grade[si][qi] > smax)
            smax = grade[si][qi];
        if (grade[si][qi] < smin)
            smin = grade[si][qi];
            ssum += grade[si][qi];
        }
    savg = ssum / GRADES;
    printf("Student #%d stats: low %d, high %d, avg %d.\n", si, smin, smax, savg
);
    }
for (si = 0; si < STUDENTS ; si++){
    printf("Student #%2d: ",si);
    for (qi = 0; qi < GRADES; qi++)
        printf("%6d ",grade[si][qi]);
    printf("\n");
}

return 0;
}

Line 28 appears to have this:

if (grade[si][qi > qmax)

Count [, and count ], and ponder the difference.