i := 3 means declare i to be an "int", which is the default numeric type. The size of that int will vary from platform to platform. See http://golang.org/ref/sp

i := 3 means declare i to be an "int", which is the default numeric type. The size of that int will vary from platform to platform. See http://golang.org/ref/spec#Numeric_types http://golang.org/ref/spec#Numeric_types