Reading and writing to a file an array of structures

/* studentarray.c - Reads a file containing a sequence of records
*                  representing students, places them into an
*                  array, then writes that array out to a new files.
*                  The names of the files are passed in as command
*                  line parameters.
*/

#include <stdio.h>

#define SIZE 10
#define NAMESIZE 25

typedef struct {
char name[NAMESIZE];
int  midterm;
int final;
int homeworks;
} student;


void writeStudentArray(char filename[], student a[], int n)
/* n is the number of elements in the array a.
* filename is the name of the file where we will
* write.
*/
{
FILE *fd;  /* File descriptor used for filename */
int i;

if(n<=0)
return;
if((fd=fopen(filename,"w"))==NULL){
perror("fopen");
exit(1);
}
for (i=0;i<n;i++){
fprintf(fd,"%s %d %d %d\n",
a->name, a->midterm, a->final, a->homeworks);
a++;
}
fclose(fd);
}

int readStudentArray(char filename[], student a[], int nmax)
/* It reads up to nmax student records 
* from file filename and stores them in a.
* It returns the number of records actually read.
*/
{
FILE *fd;  /* File descriptor used for filename */
int i=0;

if((fd=fopen(filename,"r"))==NULL){
perror("fopen");
exit(1);
}
while(fscanf(fd,"%s %d %d %d",
a->name, &a->midterm, &a->final, &a->homeworks)!=EOF){
if(++i==nmax)break;  /* We have filled up the table */
a++;
}
fclose(fd);
return i;
}

int main(int argc, char *argv[]){
int n;
student table[SIZE];

if(argc!=3){
printf("Usage: %s infile outfile\n", argv[0]);
exit(0);
}
n = readStudentArray(argv[1],table,SIZE);
writeStudentArray(argv[2],table,n);
}