Roku Developer Program

[GrantM07]

Whenever i attempt to print a float i get 7.597e+09. Thats without to string. And when i try to use .ToStr() i still get 7.597e+09. I dont know how to correct this.

[RokuBen · Accepted solution]

There's an undocumented Format method on strings that can be used like this.  The string has a C-like printf format string, and the Format method takes the arguments and applies them to the % parameters.

Brightscript Debugger> ? 7.957e+09
 7.957e+09

Brightscript Debugger> ? "%2.5f".Format(7.97e+9)
7969999872.00000

[RokuKC]

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@RokuBen wrote:

There's an undocumented Format method on strings that can be used like this.  The string has a C-like printf format string, and the Format method takes the arguments and applies them to the % parameters.

Brightscript Debugger> ? 7.957e+09
 7.957e+09

Brightscript Debugger> ? "%2.5f".Format(7.97e+9)
7969999872.00000

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I'm not sure if it was intentional to use a different value here for the example, but it confused me at first read. 🙂
With the original value I see:

Brightscript Debugger> x = 7.957e+09
Brightscript Debugger> ? "%2.5f".Format(x)
7957000192.00000

I assume that the extra 192 is due to limitation of Float precision.
If you use a Double value, which can be created using the '#' type suffix, it doesn't show that issue.

Brightscript Debugger> x = 7.957e+09#
Brightscript Debugger> ? "%2.5f".Format(x)
7597000000.00000

Also note, instead of using <string>.Format(), you can pass the format specified to <floatingPoint>.ToStr() directly.

Brightscript Debugger> x = 7.957e+09
Brightscript Debugger> ? x.ToStr("%2.5f")
7957000192.00000

Brightscript Debugger> x = 7.957e+09#
Brightscript Debugger> ? x.ToStr("%2.5f")
7597000000.00000