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Implicit conversions

Implicit conversions are automatically performed when a value is copied to a compatible type. For example:
short a=2000;
int b;
b=a;
Here, the value of a is promoted from short to int without the need of any explicit operator. This is known as a standard conversion. Standard conversions affect fundamental data types, and allow the conversions between numerical types (short to int, int to float, double to int...), to or from bool, and some pointer conversions.
Converting to int from some smaller integer type, or to double from float is known as promotion, and is guaranteed to produce the exact same value in the destination type. Read more
data-type-conversion implicit-conversion promotion

To check your knowledge the following tests are recommended:
Check your cplusplus cplusplus skills.