Variable als float in map [erledigt]

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hallo,
ich habe:

int percentm1pdruck;
float pdruck;
float m1pdruck;
float ergebnis;


pdruck = 1008,74;
m1pdruck = 1008,65;

dann wird,

percentm1pdruck = map((m1pdruck *= 10),-50,50,0,150);

ausgeführt.

danach:

ergebnis = pdruck - m1pdruck;
tft.print(ergebnis,1);

das berechnete ergebnis ist 0,09.

ausgegeben wird aber 0,9.

ist es richtig, das "map" der variable "m1pdruck" einen neuen wert zuweist?
oder nutze ich in "map" einen falschen syntax?

gruß und dank
andreas

hallo andreas,
ist es von dir gewollt, dass, bevor die map-funktion aufgerufen wird, m1pdruck nicht nur mal 10 genommen wird, sondern dieser neue wert auch in der variable gespeichert wird?
denn
code: [select]
m1pdruck *= 10
ist nicht das gleiche wie
code: [select]
m1pdruck * 10

dadurch könnte deine abweichung von 1/10 herkommen.

lg programmer


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