2.2 Const

2.2 Const
Const is fixed value, examples : 1 ,A, Tanjungkona etc. we can use one names to represent a const.
view example program :

begin
. . .
. . .
totdiscount:=tot*0.30;
totdiscountplus:=tot*0.35;

snipped program above, we can write like is:

const
discount =0.30;
discountplus=0.35;

begin
. . .
. . .
totdiscount:=tot*discount;
totdiscountplus := tot*discountplus;

why we use const :

• programs easier to read
• to avoid wrong typing
• we can use a single const repetitive, so if there any change in const, we just change it in declarations.