Understand Arrays within Structures

/*
Write a program to understand arrays within structures
*/

#include<stdio.h>
struct student{
        char name[20];
        int rollno;
        int submarks[4];
        };
main( )
{
    int i, j;
    struct student stuarr[3];
    for(i=0; i<3; i++)
    {
        printf("Enter data for student %d\n", i+1);
        printf("Enter name : ");
        scanf("%s", stuarr[i].name );
        printf("Enter roll number : ");
        scanf("%d", &stuarr[i].rollno);
        for(j=0; j<4; j++)
        {
            printf("Enter marks for subject %d : ", j+1);
            scanf("%d", &stuarr[i].submarks[j] );
        }
    }
    for(i=0; i<3; i++)
    {
        printf("Data of student %d\n", i+1);
        printf("Name : %s, Roll number : %d\nMarks : ", stuarr[i].name, stuarr[i].rollno);
        for(j=0; j<4; j++)
            printf("%d   ", stuarr[i].submarks[j] );
        printf("\n");
    }
}