Procedural: Variables, types, scopes

/**
 * variables, calculations, types, scopes
 */

// include standard input/output streams for C++
#include <iostream>

/**
 * main function
 */
int main() {
        // with "using" you don't need to always specify std::
        using std::cout; using std::endl; // note: multiple statements on one line
       
        cout<<"Example 1\n"; // \n is another way to say new-line, inside a literal text
        const int a=2; // a constant - int for "integer"
        const int b=3;
        cout<< a+b <<endl; // calculation
        cout<< b/a <<endl; // unexpected(?) result - types

        { // a separate scope
                cout<<"Example 2\n";
                const int a=2;
                const double b=3; // double for "double precision floating point"
                cout<< a+b <<endl;
                cout<< b/a <<endl; // better result; a is "upgraded" to double
        }

        {
                cout<<"Example 3\n";
                int a=2; // not const anymore, really a "variable"
                const int b=3;
                a=a+b; // assignment
                cout<< a <<","<< b <<endl; //a more complex cout
        }
       
        return 0; // zero means all is well
}