Humans are also regularly harmed by pollution. Long-term exposure to air pollution, for example, can lead to chronic respiratory disease, lung cancer and other diseases. Toxic chemicals that accumulate in top predators can make some species unsafe to eat.
#include <iostream> is the Standard C++ way to include header files, the. 'iostream' is an identifier that maps to the file iostream.h. In older C++ you had to specify the filename of the header file, hence #include. <iostream.h>. Older compilers may not recognise the modern method, newer.
C++ - stringstreams. The C++ stream library is powerful and it allows easy formatted input output operations. With stringstreams you can perform this input/output to string, this allows you to convert numbers ( or any type with the << >> stream operators overloaded ) to and from strings. With stringstreams you can use the same syntax to convert the different numeric types. To use stringstreams you need to #include <sstream>.