how to make a Ejs way to recognize that a number is 10,100,1000 etc

[lookang]

how to make a Ejs way to recognize that a number is 10,100,1000 etc

if
number is 1000 to 9999 , how to display 1000 ?

so if a number is 100 to 999, how to display 100 ?

if the number is 10 to 99, how to display 10

number 0 to 9 display as 1 ?

thanks!

[Fu-Kwun Hwang]

Your question is not limited to EJS. It is a general question related to mathematics and programming.

3≦log₁₀(x)<4 if 10002≦log₁₀(x)<3 if 100
However, java did not provide function for log₁₀(x).
It only provide nature log, i.e. ln(x).
log₁₀(x)= log_e(x)/log_e(10)

and Math.pow(a,b) will return a^b

The following formula should give you what you want.

Code:

y=(int)(Math.pow(10,(int)(Math.log(x)/Math.log(10.)+1.e-8)));

1.e-8 was added due to possible numerical error.

[lookang]

excellent help.

Code:

scaffold=(int)(Math.pow(10,(int)(Math.log(i2)/Math.log(10.)+1.e-8)));

i assign my own variables ( scaffold and i2) substitution to modify.

thanks for the programming tip.

i read a bit before on Math.pow(a,b) which is a^b

so what you suggested is 10^{(i2/log10 +1.e-8)}

[Fu-Kwun Hwang]

What I suggest is 10^{(log(i2)/log(10))+1.e-8}