Assume that x is a char variable has been declared and already given a value. Write an expression whose value is true if and only if x is alphanumeric, that is either a letter or a decimal digit.

LANGUAGE: JAVA

CHALLENGE:

Assume that x is a char variable has been declared and already given a value. Write an expression whose value is true if and only if x is alphanumeric, that is either a letter or a decimal digit.