C Struct Assignment

#include <stdio.h>
#include <conio.h>
// Khoi tao data luu cac thuoc tinh no (thuc ra la student code), name va mark
struct data{
    int no;
    char name [10];
    float mark;
};

int main(){
    int stu_num, i;         //khai bao stu_num de nhap so luong hoc sinh, bien i de chay dong lap FOR
    struct data stu[10];    //khai bao array stu luu duoc 10  du lieu va mang thuoc tinh cua data  (no, name, mark)

    printf("\nHow many student would you like to manage: ");
    scanf("%d", &stu_num);

    //Neu nhap sai thi bat nhap lai trong khoang 1-10
    while(stu_num<1||stu_num>10){
        printf("\nThe number of Student is in range 1 - 10!\nPress any key to continue...");
        getch();
        fflush(stdin);
        printf("\nHow many student would you like to manage: ");
        scanf("%d", &stu_num);
    }
    //Dung dong lap for de nhap du lieu theo so hoc sinh minh da nhap
    for (i=0;i<stu_num;i++){
        printf("\t-Enter Student %d No: ",i+1);
        scanf("%d",&stu[i].no);
        fflush(stdin);
        printf("\t-Enter Student %d Name: ",i+1);
        gets(stu[i].name);
        printf("\t-Enter Student %d Mark: ",i+1);
        scanf("%f",&stu[i].mark);
    }


    printf("\n\n--------- STUDENT INFORMATION ---------");
    printf("\n\t (Note: P - Pass, R - Ref)");
    printf("\n No     Code    Name    Mark    P/R");
    printf("\n-------+-------+-------+-------+-------");

    for (i=0;i<stu_num;i++){
        printf("\n%d\t%d\t%s\t%.2f\t",i+1,stu[i].no,stu[i].name,stu[i].mark);
        if (stu[i].mark<5){
            printf("R");
        }
        else{
            printf("P");
        }

    }

    getch();
    return 0;
}