LCD displays wrong temperature

Question

Hi I have a program that does not work right as I aspect:

v = tempC;
h = tempC * 10;
h = h % 10;
memset(stempCA, 0, sizeof(stempCA));
sprintf(stempCA, "%+.2d.%d", v, h);

it works fine on positive temperature "+11.22" but not for negative values : "-02.-1"

where is my mistake? thanx

• dannyf: > where is my mistake? test the temperature first to see if it is negative or positive. your code works for positive temperatures only.

Answer 1

I think, that -1%10=-1, not 9 as you would like. I use

if (tempC<0) {print'-';tempC=-tempC;};
print tempC as usual for positive numbers

• Jens-Uwe Klehm: no , I put it in a Buffer for LCD display, I don't use print : sprintf(Buffer2, "U:%s A:%s", stempCU, stempCA)
• Jens-Uwe Klehm: Got i myself: sprintf(stempCA, "%+.2d.%d", v, abs(h))