Writing entire array to file

#include"stdio.h"
void main()
{
FILE *p;
int i,a[10];
if((p=fopen("myfile.dat","wb"))==NULL)
{
printf("\nUnable to open file myfile.dat");
exit(1);
}
printf("\nEnter ten values, one value on each line\n");
for(i=0;i<10;i++)
scanf("%d",&a[i]);
fwrite(a,sizeof(a),1,p);
fclose(p);
getch();
}