buffer problems in c

Question

Hello everyone,

         I met a buffer problem, my code is as follows (bold font):

#include <stdio.h>

#include <stdlib.h>

#include <time.h>

struct Student

{

int stu_id;

char stu_name[10];

int stu_age;

char stu_professional[10];

};

void rand_output(Student s)

{

printf("\t ID\tname\tage\tpro\n");

printf("\t%d\t%s\t%d\t%s\n",s.stu_id,s.stu_name,s.stu_age,s.stu_professional);

}

int main()

{

    

   char answer='Y';

   int get_randNumber;

   Student stu[3]={{201301,"Ken",18,"computer"},{201302,"Mary",17,"computer"},

   {201303,"Jack",18,"computer"}};

   while (toupper(answer)=='Y')

   {

 

 // fflush(stdin);   // Assuming it is commented

      srand((unsigned)time(NULL));

      get_randNumber=rand()%(2-0+1)+0; 

      rand_output(stu[get_randNumber]);

 

 /*fflush(stdin);If the line is commented out,

          The following code will not be executed in the second to(while loop will be aborted). Why is there such a situation?

         Now, I would like to know its compiler theory.*/

 printf("\tYou like to continue anyway?(Y or N):");

 scanf("%c",&answer);

      system("cls");

   }

   

   

    return 0;

}

Regards,

Ken