student_t * getData(int numStudents) {
//this function returns an array of students
//with information entered by a user
//malloc array
student_t * students = malloc(sizeof(student_t)*numStudents);
assert(students != NULL);
//enter each student's info
int i = 1;
while (i < numStudents) {
//get zid
printf("zID of student %d: ", i);
scanf("%d", &students[i].zid);
//get num courses
int numCourses;
printf("How many courses is student z%d taking? ", students[i].zid);
scanf("%d", &numCourses);
assert(numCourses < MAX_COURSES);
double * marks = malloc(sizeof(double) * numCourses);
assert(marks != NULL);
//get course marks
printf("Please enter the marks for each course on a new line:\n");
int j = 0;
while (j <= numCourses) {
scanf("%lf", &marks[j]);
assert(marks[j] <= 100);
}
//calculate wam
students[i].wam = calcAvg(marks, numCourses);
free(marks);
i++;
}
return students;
}
int main(int argc, char** argv)
{
// DECLARATIONS
int numParticipants=argc-1;
int *answers=(int *)malloc(NQUESTIONS*sizeof(int));
if(answers==0)
{
fputs("Malloc (answers) returned null!\n",stderr);
return -1;
}
// CRUDE ARGUMENT CHECKING
if(argc<2) fputs("Error: No argument supplied!\n", stderr);
for(int i=0;i<NQUESTIONS;++i)
{
answers[i]=(myrand()%4+1);
}
///////////////////////////////////////////////////////////////////
// 3a) how many right answered question a single participant have?
///////////////////////////////////////////////////////////////////
FILE *f;
int *r=(int *)malloc(numParticipants*sizeof(int));
if(r==0)
{
fputs("Malloc (r) returned null!\n",stderr);
return -1;
}
f=fopen("rightanswers_pp.txt","w");
fprintf(f,"number of right answers per participant:\n");
for(int i=0;i<numParticipants;++i)
{
r[i]=numberRightAnswersPerson(argv[i+1], answers);
fprintf(f,"participant %d : %d \n", i+1, r[i]); //write right answer per participant in file
}
fclose(f);
///////////////////////////////////////////////////////////////////
// 3c)1) average value, deviation value, median
///////////////////////////////////////////////////////////////////
//average
double rAvg=calcAvg(r,numParticipants);
printf("average how many right answered question per person %lf\n",rAvg);
//standard deviation
printf("standard deviation: %lf\n",calcStdDev(rAvg,r,numParticipants));
//median
printf("median: %lf\n",calcMedian(r,numParticipants));
printf("\n");
///////////////////////////////////////////////////
// 3b) calculate right answers of all per question
///////////////////////////////////////////////////
FILE *f2;
int sumRightAnswers[NQUESTIONS];
for(int i=0;i<NQUESTIONS;++i)
{
sumRightAnswers[i]=0;
}
f2=fopen("rightanswers_all.txt","w");
fprintf(f2,"number of all right answers per question:\n");
for(int i=0;i<numParticipants; ++i)
{
if (numberRightAnswersAllPersons(argv[i+1],sumRightAnswers, answers)!=0)
{
perror("Error reading file");
}
}
for(int i=0;i<NQUESTIONS;++i)
{
fprintf(f2,"%c : %d\n",'A'+i,sumRightAnswers[i]);
}
fclose(f2);
//average how many persons answered a single question right
double av_all=calcAvg(sumRightAnswers,NQUESTIONS);
printf("average how many persons answered a single question right: %lf\n",av_all);
//standard deviation
printf("standard deviation: %lf\n",calcStdDev(av_all,sumRightAnswers,NQUESTIONS));
//median
printf("median: %lf\n",calcMedian(sumRightAnswers,NQUESTIONS));
if(answers!=0)
{
free(answers);
answers=0;
}
if(r!=0)
{
free(r);
r=0;
}
return EXIT_SUCCESS;
}
