U
An uninitialized variable is one that has never been set to a known value. Attempting to use such a variable is a logical error that can cause a program to act very oddly.
An unqualified name is a reference to a member variable that doesn't specify which object the member variable belongs to. When we use an unqualified name in a member function, the compiler assumes that the object we are referring to is the object for which that member function has been called.
An unsigned char is a type of integer variable. See char for details.
An unsigned int is a type of integer variable.[4] See int for details.
[4] You can also declare such a variable as unsigned without a size specifier.
An unsigned long is a type of integer variable. See long for details. ...
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