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.
std::ostream. Output stream objects can write sequences of characters and represent other kinds of data. Specific members are provided to perform these output operations (see functions below). The standard objects cout, cerr and clog are objects of this type. This is an instantiation of basic_ostream with the following template parameters: