78 lines
1.6 KiB
C
78 lines
1.6 KiB
C
|
#include <stdio.h>
|
||
|
|
#include <stdlib.h>
|
||
|
|
|
||
|
|
struct MyStruct
|
||
|
|
{
|
||
|
|
int NoItems;
|
||
|
|
int max;
|
||
|
|
float average;
|
||
|
|
};
|
||
|
|
|
||
|
|
int main()
|
||
|
|
{
|
||
|
|
|
||
|
|
struct MyStruct MyRecord;
|
||
|
|
FILE *fptr;
|
||
|
|
|
||
|
|
int ArrayData[100];
|
||
|
|
int items = 0;
|
||
|
|
int sum = 0;
|
||
|
|
int i;
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
/* Write this file to disk - binary format, usual error checking */
|
||
|
|
fptr = fopen ("strdata.dat","wb");
|
||
|
|
if ( fptr == NULL )
|
||
|
|
{
|
||
|
|
printf ("\nError creating file - aborting ");
|
||
|
|
exit (0);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Populate the array & set header values*/
|
||
|
|
for ( i = 0 ; i < 100 ; i++)
|
||
|
|
{
|
||
|
|
ArrayData[i] = i;
|
||
|
|
if ( ArrayData [i] > MyRecord.max)
|
||
|
|
MyRecord.max = ArrayData[i];
|
||
|
|
sum = sum + ArrayData[i];
|
||
|
|
items++;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Update the values in the structure */
|
||
|
|
MyRecord.NoItems = items;
|
||
|
|
MyRecord.NoItems = (float)sum / (float)items;
|
||
|
|
|
||
|
|
/* This line does the writing of the structure */
|
||
|
|
fwrite ( &MyRecord, sizeof(struct MyStruct), 1, fptr);
|
||
|
|
|
||
|
|
|
||
|
|
/* This line does the writing of the Array */
|
||
|
|
fwrite ( &ArrayData[0], sizeof(int),100, fptr);
|
||
|
|
|
||
|
|
|
||
|
|
/* And close */
|
||
|
|
fclose (fptr);
|
||
|
|
|
||
|
|
/* To read the data we would use */
|
||
|
|
|
||
|
|
fptr = fopen ("strdata.dat","rb");
|
||
|
|
if ( fptr == NULL )
|
||
|
|
{
|
||
|
|
printf ("\nError opening input file - aborting ");
|
||
|
|
exit (0);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* This line does the reading */
|
||
|
|
fread ( &MyRecord, sizeof(struct MyStruct), 1, fptr);
|
||
|
|
printf ("No. items in the file = %d", MyRecord.NoItems);
|
||
|
|
printf ("Maximum = %d", MyRecord.max);
|
||
|
|
printf ("Average is = %.2f", MyRecord.average);
|
||
|
|
|
||
|
|
/* And close */
|
||
|
|
fclose (fptr);
|
||
|
|
|
||
|
|
/* All Done */
|
||
|
|
return 0;
|
||
|
|
}
|