By Laurence A Tepolt

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On the other hand, although uint is a very large type, it cannot represent the concept of an ID number for each living person, as its maximum value is less than the world population of 7 billion. long and ulong would be more than enough to represent many concepts. As a general rule, as long as there is no specific reason not to, you can use int for integer values. Overflow The fact that types can have a limited range of values may cause unexpected results. For example, although adding two uint variables with values of 3 billion each should produce 6 billion, because that sum is greater than the maximum value that a uint variable can hold (about 4 billion), this sum overflows.

The program should not accept any other number; it should ask again. Once the program takes a valid number from Anna, it should start taking numbers from Bill until he guesses Anna's number correctly. Note: The numbers that Anna enters obviously stays on the terminal and can be seen by Bill. Let's ignore this fact and write the program as an exercise of the while statement. The solutions are on page 684. 30 12 Integers and Arithmetic Operations We have seen that the if and while statements allow programs to make decisions by using the bool type in the form of logical expressions.

This operator produces true if only one expression is true, but not both. Warning: In reality, this operator is not a logical operator but an arithmetic one. It behaves like a logical operator only if both of the expressions are bool. "). "). "). This operator is the opposite of the > operator. "). This operator is the opposite of the < operator. 20 Logical Expressions writeln("We did not beat: ", theirScore >= ourScore); ∙ The ! operator means "the opposite of". Different from the other logical operators, it takes just one expression and produces true if that expression is false, and false if that expression is true.