Program to the record of students using Dynamic memory allocation(DMA)

#include<stdio.h>
#include<conio.h>
struct student
{
    int rollno;
    char name[30];
    int age;
};
void main()
{
    int records,i;
    struct student *s;
    printf("How many records u want to enter \n");
    scanf("%d",&records);
    s=(struct student *)calloc(records,sizeof(struct student));
    for(i=0;i<records;i++)
    {
        printf("\n Enter the rollno");
        scanf("%d",&s[i].rollno);
        printf("\n Enter the name");
        scanf("%s",s[i].name);
        printf("\n Enter the age");
        scanf("%d",&s[i].age);
    }
    for(i=0;i<records;i++)
    {
        printf("\n Rollno:%d",s[i].rollno);
        printf("\n Name:%s",s[i].name);
        printf("\n Age:%d",s[i].age);
    }
    getch();
}