Dotaz: scale v bc

[dan]

echo 'scale=2; 2.3333*5.55' | bc
12.9498

bc -v
bc 1.06.94

Rad bych mel vysledek z bc jen se dvemi desetinymi misty. Definice scale ve vyse zminenem prikladu nereaguje (pokud tomu dobre rozumim). Kde delam chybu?
Pritom priklad se zlomkem celych cisel ano...

echo 'scale=2; 5/4' | bc
1.25

Odpovědi

[Ivanhoej]

Ved nemozes cez scale urezat cislo pri nasobeni. To mozes jedine zaokruhlit.

echo '2.3333*5.55' | bc | xargs printf "%.2f"

[dan]

...aha, diky za radu.

[luky]

Unless specifically mentioned the scale of the result is the maximum scale of the expressions involved.

expr * expr
The result of the expression is the product of the two expressions.

expr / expr
The result of the expression is the quotient of the two expressions.
The scale of the result is the value of the variable scale.