Therefore, using namespace std tells C++ compiler to use the standard C++ library.Once defined, a const variable/object is not assigned to any other value in any way during program duration.Hence, if a is declared as int a, value of a can be changed at different times in the program.However, if a is declared as const int a, once initialized it cannot be changed again.What does the keyword volatile mean in C language?Explain the concept of pointer.It is amount of time taken by an algorithm to run as a function of input string length.It makes a lot of sense to be able to estimate run time before starting an algorithm/program to see if we are efficiently using all the resources.
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