Answer the following statements true (T) or false (F)

Question

1. You get the manipulators endl and member functions setf and precision with the iostream header, but you have to include the iomanip header to get the manipulators setw and setprecision..
2. You don’t need using directives or using declarations to use the setw or setprecision manipulators.
3. C++ uses the system file name for the program file name.
4. For the binary search in the text to work, the element searched for must actually be
present in the array.

Answer 1

1. True
2. False
To use these iomanipulators, you must either place the include directive
#include
and this using directive prior to use of the manipulators,
using namespace std;
or place the following using declarations
using std::setw;
using std::setprecision;
in your program in a scope that includes your use of these manipulators, prior to their use.
3. False.
Some languages do this but C++ requires that you declare a file stream variable and explicitly attach it to the system file name. System file names frequently have characters in them that are illegal in C++ names. This would place too strong a restriction on file names that C++ programs can manipulate.
4. False
The routine in the text sets the bool reference variable to false if the key
is not found.