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matematisk beregning i C hvor afrunding driller



hejsa
jeg har i ncurses gui'et til mit program en linje som skal symbolisere
en placering af en kran.
Linjens længde afhænger af terminalens størrelse, men er altid
"Linjer-10". denne kalder jeg "len". 
Kranen har 255 positioner som den kan stå i. Disse skal vises på de
"len" antal punkter. 
0 og 255 er yderstillingerne. 
hvordan får jeg omregnet så de "len" antal positioner kan vise de 255
positioner? . 

len = L-10;
parts= (255.0/(len));
place = floorf(len-((int)(pos/parts)%(len));

Dette giver dog kun en fordeling mellem 0 og 235. hvorfor aner jeg ikke
helt! 

Any ideas? 

MVH
Kim


 
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