Random file read/write operations

# Include <stdlib. h>
# Include <stdio. h>
# Include <conio. h>
# Define N 4
Extern unsigned _ floatconvert;
# Pragma extref _ floatconvert
Struct student
{
Int num;
Char name [10];
Char sex;
Int age;
Float grade;
} STU [N] ={{ 101, "Zhang", 'M', 19, 95.6 },
{102, "Wang", 'F', 18, 92.4 },
{103, "Zhao", 'M', 18, 91.5 },
{104, "Li", 'F', 17, 98.7 }};
Void save ()
{
File * FP;
Int I;
If (FP = fopen ("D: \ student. dat", "WB") = NULL)
{
Printf ("cannot open this file! \ N ");
Return;
}
For (I = 0; I <n; I ++)
If (fwrite (& STU [I], sizeof (struct student), 1, FP )! = 1)
Printf ("file write error! \ N ");
Fclose (FP );
}
Void read ()
{
File * FP;
Int I;
Struct student stud [N];
If (FP = fopen ("D: \ student. dat", "rb") = NULL)
{
Printf ("cannot open the file! \ N ");
Return;
}
For (I = 0; I <n; I ++)
{
Fread (& stud [I], sizeof (struct student), 1, FP );
Printf ("% d \ t % s \ t % C \ t % d \ t %. 1f \ n ", stud [I]. num, stud [I]. name, stud [I]. sex, stud [I]. age, stud [I]. grade );
}
Fclose (FP );
}

Void main ()
{
Clrscr ();
Save ();
Read ();
Getch ();
}