SW006013 Microchip Technology, SW006013 Datasheet - Page 65

• Manufacturer Part Number: SW006013
• Description: MPLAB C Compiler For DsPIC DSCs
• Manufacturer: Microchip Technology
• Series: DsPIC30F/33Fr
• Type: MPLAB® C Compilerr

Specifications of SW006013

• Supported Families: DsPIC30F, DsPIC33F
• Core Architecture: DsPIC
• Kit Contents: Software And Docs
• Mcu Supported Families: DsPIC30F And DsPIC33F
• Tool Function: Compiler
• Tool Type: Compiler
• Processor Series: dsPIC
• Lead Free Status / RoHS Status: na
• For Use With/related Products: dSPIC DSCs
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

© 2008 Microchip Technology Inc.
fread (Continued)
}
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.
if ((buf = fopen("afile.out", "r+")) != NULL)
{
}
else
numread = fread(readnums, sizeof(double),
printf("Read %d numbers\n", numread);
for (x = 0; x < 10; x++)
{
}
fclose(buf);
printf("Cannot open afile.out\n");
printf("%d * %f = %f\n", x+1, readnums[x],
(x + 1) * readnums[x]);
10, buf);
DS51456E-page 61