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Standard C Libraries
fread (Continued)
if ((buf = fopen("afile.out", "r+")) != NULL)
{
numread = fread(readnums, sizeof(double),
10, buf);
printf("Read %d numbers\n", numread);
for (x = 0; x < 10; x++)
{
printf("%d * %f = %f\n", x+1, readnums[x],
(x + 1) * readnums[x]);
}
fclose(buf);
}
else
printf("Cannot open afile.out\n");
}
Output:
10.0/1 = 10.000000
10.0/2 = 5.000000
10.0/3 = 3.333333
10.0/4 = 2.500000
10.0/5 = 2.000000
10.0/6 = 1.666667
10.0/7 = 1.428571
10.0/8 = 1.250000
10.0/9 = 1.111111
10.0/10 = 1.000000
Wrote 10 numbers
Read 10 numbers
1 * 10.000000 = 10.000000
2 * 5.000000 = 10.000000
3 * 3.333333 = 10.000000
4 * 2.500000 = 10.000000
5 * 2.000000 = 10.000000
6 * 1.666667 = 10.000000
7 * 1.428571 = 10.000000
8 * 1.250000 = 10.000000
9 * 1.111111 = 10.000000
10 * 1.000000 = 10.000000
Explanation:
This program uses fwrite to save 10 numbers to a file in binary form.
This allows the numbers to be saved in the same pattern of bits as the
program is using which provides more accuracy and consistency. Using
fprintf would save the numbers as text strings which could cause
the numbers to be truncated. Each number is divided into 10 to pro-
duce a variety of numbers. Retrieving the numbers with fread to a
new array and multiplying them by the original number shows the num-
bers were not truncated in the save process.
? 2008 Microchip Technology Inc.
DS51456E-page 61
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