Cpp - Output Boolean Values

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Introduction

By default the << operator outputs boolean values as integers, with the value 0 representing false and 1 true.

To output the strings true or false instead, the flag ios::boolalpha must be set.

Use either the setf() method or the manipulator boolalpha. 

bool ok = true; 
cout << ok << endl                // 1 
     << boolalpha << ok << endl;  // true

You can revert this setting using the noboolalpha manipulator.