Please help filling in the functions displaycourses(), enternew(), displaydb() #include
#include
#include
#include

#define SIZE 30
#define fieldLength 200

#define diskFile "diskFile. dat"
#define courseFile "course. txt"

struct db_type
{
char name[fieldLength];
int age;
char course1[fieldLength];
char course2[fieldLength];
char status[fieldLength];
};

struct courseInfo
{
char code [20]; // e. g., EECS2030
char title [fieldLength];
char date [20];
char time_start [20];
char time_end [20];
char location [20];
};

struct courseInfo courseArr[SIZE]; // global variable array of struc

char prompt_menu(void);
void init_list(struct db_type * pArr[]);
void clearDB(struct db_type * pArr[]);
void init_courseArr(void);

void writeDisk(struct db_type * pArr[]);
void emptyDisk(void);
void loadDisk(struct db_type * pArr[]);

int main(int argc, char *argv[])
{

struct db_type * db_pArr[SIZE]; // main db storage

init_list(db_pArr); // set to NULL

init_courseArr(); // load course from diskfile

char choice;
for(; ;){
choice = prompt_menu();
switch (choice)
{
case 'n': enterNew(db_pArr); break;
case 'd': displayDB(db_pArr); break;
case 'w': writeDisk(db_pArr); break;
case 'l': loadDisk(db_pArr); break;
case 's': sort(db_pArr); break;

case 'c': clearDB(db_pArr); break;
case 'e': emptyDisk();break;

case 'v': displayCourses();break;
case 'p': swap(db_pArr); break;
case 'r': removeRecord(db_pArr);break;

case 'q': exit(1); // terminate the whole program
}

}
return 0;
}

void init_list(struct db_type * pArr[]){
int t;
for (t=0; t {
pArr[t]= NULL;
}
}

void clearDB(struct db_type * pArr[]){
char c3[3];
printf("are you sure to clear db? (y) or (n)? ");

fgets(c3,3,stdin);

if(! strcmp(c3, "y\n"))
init_list(pArr);
}

char prompt_menu(void){
char s[80];
while(1){
printf("\n\n");
printf("| %-20s","(N)ew record");
printf("%-20s","(R)emove record");
printf("Swa(p) records\t|\n");
printf("| %-20s","(S)ort database");
printf("%-20s","(C)lear database");
printf("(D)isplay db\t|\n");

printf("| %-20s","(L)oad disk");
printf("%-20s","(W)rite disk");
printf("(E)mpty disk\t|\n");

printf("| %-20s", "(V)iew courses");//|\tSwa(p) record\t(Q)uit\t\t\t\t|\n");
printf("%-20s","(Q)uit");
printf("*Case Insensitive*\t|\n");
printf("\n");
printf("choose one: ");

fgets(s,50, stdin); // \n added

if (strlen(s) == 2 && strchr("edlsuqrcwnvpr", tolower(*s)))
return tolower(*s); // s[0], return the first character of s
//else
printf("not a valid input!\n");

}
}

/* display all or specified course */
void displayCourses(void){
; // the provide PE2.out uses "%s\t%-40s%-5s %s-%s %s\n" as formatting string for printing each course info

}

/* input items into the list */
void enterNew(struct db_type * pArr[SIZE]){
;

}

/* display records */
void displayDB(struct db_type * pArr[]){
;

}