dart Unhandled Exception: type 'int' is not a subtype of type 'double' in type cast code example

Example 1: 'int' is not a subtype of type 'double' dart

double myDouble = myInt.toDouble();

Example 2: type 'double' is not a subtype of type 'String' of 'function result' dart

This will fix the error type 'int' is not a subtype of type 'double'
To fix type 'double' is not a subtype of type 'String', you need to find out 
the parameter which is returned as a double and you are trying to initialize 
it to a string variable.

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C Example