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We can designate constant values in C++ by using the "const" keyword.

For example:

const int MAX_VALUE = 100;

This line of code declares a constant integer variable named "MAXVALUE" with a value of 100. The "const" keyword ensures that the value of MAXVALUE cannot be changed throughout the program.

We can also declare constant pointers, references, and member functions in C++ using the "const" keyword.