array of structures program in c

Array of structures program in c

#include<stdio.h>
#include<conio.h>
  struct student
    {
     char name[20];
     int roll_no;
     char clas[10];
     char dob[10];
    };
  int main()
    {
     struct student s1[20];
      int i,n;
      printf("How many student information you will be enter:-");
      scanf("%d",&n);   
   for(i=1;i<=n;i++)
   {  
      printf("\nEnter no. %d student information\n",i);
      fflush(stdin);
      printf("Name\t:-");
      gets(s1[i].name);
      printf("Roll No.\t:-");
   scanf("%d",&s1[i].roll_no);
      printf("Class\t:-");
      scanf("%s",s1[i].clas);
      printf("Date of birth\t:-");
      scanf("%s",s1[i].dob);
      }
      printf("\nEntered student information\n"); 
      for(i=1;i<=n;i++)
        {
  printf("\nName\t:-%s\n",s1[i].name);
        printf("Roll No.\t:-%d\n",s1[i].roll_no);
        printf("Class\t:-%s\n",s1[i].clas);
        printf("Date of birth\t:-%s\n\n",s1[i].dob);
       }
      getch();
      return 0;
      }

Output:-