I could not assign Int32 var/let to Int64 var/let or vice-versa in Swift. I get a compile time error when I attempt to do so. What is the reason behind this ?

CodePudding user response：

If you declare a variable as Int32, the memory allocated for that variable is 4bytes and for Int64 type variable the memory allocated is 8 bytes.

You can't put 64bytes data into 32 byte data as you can't put 2litres of water into 1 litre bottle.

In order to avoid such problems, swift has strict type checking feature and ensure such problems are not arise in run time.