Credits to http://moeffju.net/blog/using-bigint-columns-in-rails-migrations class CreateDemo < ActiveRecord::Migration def self.up create_table :demo, :id => false do |t| t.integer :id, :limit => 8 end end end See the option :id => false which disables the automatic creation of the id field The t.integer :id, :limit => 8 line will produce a 64 bit integer field
You can’t convert an integer directly to a Character instance, but you can go from integer to UnicodeScalar to Character and back again: let startingValue = Int((“A” as UnicodeScalar).value) // 65 for i in 0 ..< 26 { print(Character(UnicodeScalar(i + startingValue))) }
“What are the differences between Integer and Int?” Integer is just an alias for java.lang.Integer. Int is the Scala integer with the extra capabilities. Looking in Predef.scala you can see this the alias: /** @deprecated use <code>java.lang.Integer</code> instead */ @deprecated type Integer = java.lang.Integer However, there is an implicit conversion from Int to java.lang.Integer if … Read more
the Integer class is provided so that values can be boxed/unboxed in a pure OO manner. use int where appropriate unless you specifically need to use it in an OO way; in which case Integer is appropriate. Java Int vs Integer However, very different things are going on under the covers here. An int is … Read more
read can parse a string into float and int: Prelude> :set +t Prelude> read “123.456” :: Float 123.456 it :: Float Prelude> read “123456” :: Int 123456 it :: Int But the problem (1) is in your pattern: createGroceryItem (a:b:c) = … Here : is a (right-associative) binary operator which prepends an element to a … Read more
The ASCII table is arranged so that the value of the character ‘9’ is nine greater than the value of ‘0’; the value of the character ‘8’ is eight greater than the value of ‘0’; and so on. So you can get the int value of a decimal digit char by subtracting ‘0’. char x … Read more
In C++11, use std::stoi as: std::string s = “10”; int i = std::stoi(s); Note that std::stoi will throw exception of type std::invalid_argument if the conversion cannot be performed, or std::out_of_range if the conversion results in overflow(i.e when the string value is too big for int type). You can use std::stol or std:stoll though in case … Read more
Because Convert.ToInt32 rounds: Return Value: rounded to the nearest 32-bit signed integer. If value is halfway between two whole numbers, the even number is returned; that is, 4.5 is converted to 4, and 5.5 is converted to 6. …while the cast truncates: When you convert from a double or float value to an integral type, … Read more
Note that there is a difference between a cast to long and a cast to Long. If you cast to long (a primitive value) then it should be automatically boxed to a Long (the reference type that wraps it). You could alternatively use new to create an instance of Long, initializing it with the int … Read more
Use Convert.ToInt32 from mscorlib as in decimal value = 3.14m; int n = Convert.ToInt32(value); See MSDN. You can also use Decimal.ToInt32. Again, see MSDN. Finally, you can do a direct cast as in decimal value = 3.14m; int n = (int) value; which uses the explicit cast operator. See MSDN.