#include <stdio.h>
#include<stdlib.h>
#include<time.h>
struct quizzes{
int GT, RT, A, C, ADS, HA;
// group_theory, ring_theory, analysis, C_programming, advanced_data_structures, homological_algebra
};
struct student{
char name[20],gender, ID[20];
struct quizzes quiz_1, quiz_2, mid_semester, final, total_score;
struct student * next;
};
void random_mark(struct quizzes* ptr){
ptr->GT = 35+(rand()%66);
ptr->RT = 35+(rand()%66);
ptr->A = 35+(rand()%66);
ptr->C = 35+(rand()%66);
ptr->ADS = 35+(rand()%66);
ptr->HA = 35+(rand()%66);
}
struct student * create_link( int n){
srand(time(NULL));
struct student *head_ptr, *current_ptr;
head_ptr= malloc(sizeof(struct student)); // creating head pointer
scanf("\n");
printf("Enter the student name: \n");
fflush(stdout);
fgets((head_ptr->name), sizeof(head_ptr->name), stdin);
printf("Enter student Gender:\n ");
fflush(stdout);
head_ptr->gender = getchar();
scanf("\n");
printf("Enter student ID:\n ");
fflush(stdout);
fgets((head_ptr->ID), sizeof(head_ptr->ID), stdin);
random_mark(&(head_ptr->quiz_1));
random_mark(&(head_ptr->quiz_2));
random_mark(&(head_ptr->mid_semester));
random_mark(&(head_ptr->final));
//////////////////////////total_score///////////////////////////////////////////
(head_ptr->total_score).GT = (head_ptr->quiz_1).GT+ (head_ptr->quiz_2).GT+(head_ptr->mid_semester).GT+ (head_ptr->final).GT;
(head_ptr->total_score).RT = (head_ptr->quiz_1).RT+ (head_ptr->quiz_2).RT+(head_ptr->mid_semester).RT+ (head_ptr->final).RT;
(head_ptr->total_score).A = (head_ptr->quiz_1).A+ (head_ptr->quiz_2).A+(head_ptr->mid_semester).A+ (head_ptr->final).A;
(head_ptr->total_score).C = (head_ptr->quiz_1).C+ (head_ptr->quiz_2).C+(head_ptr->mid_semester).C+ (head_ptr->final).C;
(head_ptr->total_score).ADS = (head_ptr->quiz_1).ADS+ (head_ptr->quiz_2).ADS+(head_ptr->mid_semester).ADS+ (head_ptr->final).ADS;
(head_ptr->total_score).HA = (head_ptr->quiz_1).HA+ (head_ptr->quiz_2).HA+(head_ptr->mid_semester).HA+ (head_ptr->final).HA;
////////////////////////////////////////////////////////////////////////////////
current_ptr= head_ptr;
for(int i=1; i<n; i++){ // using current pointer to create link_list;
(current_ptr->next) = malloc(sizeof(struct student));
printf("Enter the student name: ");
fflush(stdout);
fgets(current_ptr->next->name, sizeof(current_ptr->next->name), stdin);
printf("Enter student Gender: ");
fflush(stdout);
current_ptr->next->gender = getchar();
printf("Enter student ID: ");
fflush(stdout);
fgets(current_ptr->next->ID, sizeof(current_ptr->next->ID), stdin);
random_mark(&(current_ptr->next->quiz_1));
random_mark(&(current_ptr->next->quiz_2));
random_mark(&(current_ptr->next->mid_semester));
random_mark(&(current_ptr->next->final));
//////////////////////////total_score///////////////////////////////////////////
(current_ptr->next->total_score).GT = (current_ptr->next->quiz_1).GT+ (current_ptr->next->quiz_2).GT+(current_ptr->next->mid_semester).GT+ (current_ptr->next->final).GT;
(current_ptr->next->total_score).RT = (current_ptr->next->quiz_1).RT+ (current_ptr->next->quiz_2).RT+(current_ptr->next->mid_semester).RT+ (current_ptr->next->final).RT;
(current_ptr->next->total_score).A = (current_ptr->next->quiz_1).A+ (current_ptr->next->quiz_2).A+(current_ptr->next->mid_semester).A+ (current_ptr->next->final).A;
(current_ptr->next->total_score).C = (current_ptr->next->quiz_1).C+ (current_ptr->next->quiz_2).C+(current_ptr->next->mid_semester).C+ (current_ptr->next->final).C;
(current_ptr->next->total_score).ADS = (current_ptr->next->quiz_1).ADS+ (current_ptr->next->quiz_2).ADS+(current_ptr->next->mid_semester).ADS+ (current_ptr->next->final).ADS;
(current_ptr->next->total_score).HA = (current_ptr->next->quiz_1).HA+ (current_ptr->next->quiz_2).HA+(current_ptr->next->mid_semester).HA+ (current_ptr->next->final).HA;
////////////////////////////////////////////////////////////////////////////////
current_ptr= current_ptr->next;
}
current_ptr = NULL;
return head_ptr; // returning head pointer;
}
void print_quiz(FILE* fptr, struct quizzes quiz)
{
fprintf(fptr, "Group theory: %d\n",(quiz).GT);
fprintf(fptr, "Ring theory: %d\n",(quiz).RT);
fprintf(fptr, "analysis: %d\n",(quiz).A);
fprintf(fptr, "C_programming: %d\n",(quiz).C);
fprintf(fptr, "Hdvanced_data_structures: %d\n",(quiz).ADS);
fprintf(fptr, "Homological_algebra: %d\n",(quiz).HA);
}
void print_list( struct student* ptr, int n )
{
FILE*fptr= fopen("students.txt", "a");
for(int i=0; i< n; i++){
fprintf(fptr,"Name: %s", ptr->name);
fprintf(fptr,"Gender: %c\n", ptr->gender);
fprintf(fptr,"ID: %s", ptr->ID);
fprintf(fptr, "QUIZ 1\n");
/*fprintf(fptr, "Group theory: %d\n",(ptr->quiz_1).GT);
fprintf(fptr, "Ring theory: %d\n",(ptr->quiz_1).RT);
fprintf(fptr, "analysis: %d\n",(ptr->quiz_1).A);
fprintf(fptr, "C_programming: %d\n",(ptr->quiz_1).C);
fprintf(fptr, "Hdvanced_data_structures: %d\n",(ptr->quiz_1).ADS);
fprintf(fptr, "Homological_algebra: %d\n",(ptr->quiz_1).HA);*/
print_quiz(fptr, ptr->quiz_1);
fprintf(fptr, "QUIZ 2\n");
print_quiz(fptr, ptr->quiz_2);
fprintf(fptr, "MID_Semester\n");
print_quiz(fptr, ptr->mid_semester);
fprintf(fptr, "Final\n");
print_quiz(fptr, ptr->final);
fprintf(fptr, "total\n");
print_quiz(fptr, ptr->total_score);
ptr=ptr->next;
}
fclose(fptr);
}
int main(void)
{
struct student* sptr, *ascending_ptr, *descending_ptr;
int n ;
setbuf(stdout, NULL);
printf("Enter a number: \n");
fflush(stdout);
scanf("%d\n", &n);
sptr= create_link(n);
print_list(sptr,n);
}
The code is quite long, but It's needed for the execution of the program so i added it. But the problem is in the function struct student * create_link( int n), I have used printf and fgets, the fgets start to execute before the printf prints. I have used fflush(stdout) but still, nothing happens. why fflush is not solving this problem? (I also tried fprintf(strerr, "..."); but that didn't help either)
