Given the following definition of a StudentRecord and #define's:

typedef struct {
	char 		name[MAX_NAME_LEN];
	int		stID;
	double		cse142Grade;
} StudentRecord;

#define	LESS		-1
#define	EQUAL		0
#define	GREATER		1

Write a function which:

Solution: 
void swapStudentRecords(StudentRecord *first, StudentRecord *second) {
   StudentRecord temp = *first;
   *first = *second;
   *second = temp;
}

int compareByName(StudentRecord *first, StudentRecord *second) {
   int result = strcmp(first->name, second->name);
   return result;
}


int compareByID(StudentRecord *first, StudentRecord *second) {
   if(first->stID > second->stID)
      return GREATER;
   else if(first->stID < second->stID)
      return LESS;
   else
      return EQUAL;
}

int compareByGrade(StudentRecord *first, StudentRecord *second) {
   if(first->cse142Grade > second->cse142Grade)
      return GREATER;
   else if(first->stID < second->stID)
      return LESS;
   else
      return EQUAL;
}