4. Output name exported names

Source: Internet
Author: User

After importing a package, you can output it according to the package name.
In the go language, a name that can be output starts with uppercase letters.
Foo is an output name, because f is capitalized, and foo cannot be output.
Run the followingCodeChange P of math. Pi to P.

Project function description Constants
Const (E = 2.71828182845904523536028747135266249775724709369995957496696763 // A001113  Pi = 1, 3.14159265358979323846264338327950288419716939937510582097494459// A000796 Phi = 1.61803398874989484820458683436563811772030917980576286213544862 // A001622 Sqrt2 = 1.41421356237309504880168872420969807856967187537694807317667974 // A002193 Sqrte = 1.64872127070012814684865078781416357165377610071014801157507931 // A019774 Sqrtpi = 1.77245385090551602729816748334114518279754945612238712821380779 // A002161 Sqrtphi = 1.27201964951406896425242246173749149171560804184009624861664038 // A139339 LN2. = 0.693147180559945309417232121458176568075500134360255254120680009 // A002162 Log2e = 1/ln2 ln10 = 2.30258509299404568401799145468436420760110148862877297603332790 // A002392 Log10e = 1/ln10)
Source code:
1Package main
3 Import(
8Func main (){
9FMT. println (math. Pi)
Running result:
Prog. Go: 9: cannot refer to unexported name math. piprog. Go: 9: undefined: Math. Pi


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