The other built-in data types

1. integer.C. Define (i.e., create) variables of the other signed integer data types.
   • Integer means the values have to be whole numbers.
   • Signed means the values can be positive, negative, or zero.
   Exercises. What is 2⁶³? What is 2¹⁵? Why am I asking about these powers?
2. double.C. Define variables of types that can hold a number with a fraction.
3. format.C. Output more (or fewer) of the digits of a double.
   Compile with the command line option -std=c++20 because std::format is a new feature available in the C++20 version of the language C++.
4. bool.C. A variable of type int can hold one of 4,294,967,296 different values, from -2,147,483,648 to 2,147,483,647 inclusive.
   A variable of type bool can hold one of only 2 different values.
   Exercise. Change true to false in this program.
5. char.C. On storm.cis.fordham.edu, a variable of type char can hold the code number of a single ASCII character.
   That’s all it can hold: one number, representing one character.
6. string.C. A variable of type std::string can hold a string (series) of characters.