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Boolean Operations

• The && and || operators are computed using lazy evaluation.
• The expressions are evaluated from left to right, and evaluation stops as soon as the truth value is determined.

  if (cin.fail() || area < 0) cout << "Input error.\n";
          
  if (r >= 0 && -b / 2 + sqrt(r) >= 0) ...
  

• The ! (not) operator takes a single condition and evaluates to true if that condition is false and to false if that condition is true.

  if (!cin.fail()) quarters = quarters + n;
  

• Summary:

  A B A && B true true true true false false false Any false		A B A ||B true Any true true false true false false false
  	A !A true false false true

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