printf problem with float. ex. fahrenheit to celsius...

[MikeV]

using 18F876.
I copied from page 12 in the K&R book to convert fahrenheit to celsius:

void main(void)
{
float fahr, celsius;
int lower, upper, step;

lower = 0;
upper = 300;
step = 20;

printf("\r\n\r\n\r\n\r\n");
fahr = lower;
while (fahr <= upper)
{
celsius = (5.0/9.0) * (fahr - 32.0);
printf ("%6.1f %6.1f\r\n", fahr, celsius);
fahr = fahr + step;
}
}

HOWEVER, when i do a printf to hyperterminal, it freezes and only gives me a partial printout:

.0 -17.7
19.9 -6.6
39.9 4.4

But when I change "int lower, upper, step" to a float, then i get the desired printout:

.0 -17.7
19.9 -6.6
39.9 4.4
59.9 15.5
79.9 26.6
99.9 37.7
119.9 48.8
139.9 60.0
159.9 71.1
179.9 82.2
199.9 93.3
219.9 104.4
239.9 115.5
259.9 126.6
279.9 137.7
299.9 148.8

Does the CCS compiler have anything against adding a float and an int?

p.s. the actual celsius equivalent to 0F is -17.77. K&R's example output on a different platform will print -17.8. However, the PIC prints -17.7. How can I avoid this truncation and instead round up to the next tenths?

Thanks,
Mike
Thanks,
Mike

[Neutone]

[chux]

[Guest]

just cast the int to afloat to avoid confussion