68 - Implicit Conversions

An implicit type conversion is automatically applied by the compiler in some cases during assignments, when passing arguments to functions and when applying operators

implicit conversion between value-types is possible if it makes sense semantically and no information is lost
For example, uint8 is convertible to uint16 and int128 to int256, but int8 is not convertible to uint256, because uint256 cannot hold values such as -1

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Type Conversion
Compiler Appied
Assignments/Arguments/Operators
Semantic Sense
No Information Lost
E.g.: uint8 -> uint16, int128 -> inte256, int128 X -> uint256, uint256 X -> uint128

References

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