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");
}
}