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The C++ Built-In Data Type 
C++ provides built-in support for primitive arithmetic data types such as integer:
//declares an integer object, ival
//initialized to a first value of 1024
int ival = 1024;
It also supports double precision and single precision floating point data types:

Part I. Introduction  
 

How to Solve a Problem?  
 
Programs often are written in response to some problems or task to be solved. For example, a bookstore enters into a file the title and publisher of each book it sells. The information entered in the order the books are sold. Every tweo weeks the owner computes by hand [...]