what's the difference between abstract class and concreate
class? what's the meaning of standard template library(STL)?
Answer Posted / dumitru
In C++ an abstract class is a class that contain at least
one pure virtual function ( f()=0; ) and is related at using
this only for inheritance, not for instance an object from
this directly.
The Standard Template Library, or STL, is a C++ library of
container classes, algorithms, and iterators; it provides
many of the basic algorithms and data structures of
computer science. The STL is a generic library, meaning
that its components are heavily parameterized: almost every
component in the STL is a template.
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help me i need a c++ program which takes sequesnce of characters and outputed sequence of their token taypes, work same compiler in lexical analysis phase
If P is the population on the first day of the year, B is the birth rate, and D is the death rate, the estimated population at the end of the year is given by the formula: The population growth rate is given by the formula: B – D Write a program that prompts the user to enter the starting population, birth and death rates, and n, the number of years. The program should then calculate and print the estimated population after n years. Your program must have at least the following functions: 1. growthRate: This function takes its parameters the birth and death rates, and it returns the population growth rate. 2. estimatedPopulation: This function takes its parameters the current population, population growth rate, and n, the number of years. It returns the estimated population after n years Your program should not accept a negative birth rate, negative death rate, or a population less than 2. please answer my question ....
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