A simple program that will only accept numbers using the C++ programming language.

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Program Listing

#include <iostream>
#include <limits>

const auto MaxIgnore =  std::numeric_limits<std::streamsize>::max();

int main()
    int num = 0 ;
    bool done = false;

     std::cout <<"\n\n";
     std::cout <<"\tAccepts Only Numbers in C++";
     std::cout <<"\n\n";
		std::cout <<"\n";
		std::cout << "\tEnter an integer: ";
        if(std::cin >> num)
            std::cout <<"\n";
			std::cout << "\tWell done. You entered: " << num;
            done = true;
            std::cout <<"\n";
			std::cout << "\tInvalid input!\n";
            std::cin.ignore(MaxIgnore, '\n');
	 std::cout <<"\n\n";
     std::cout <<"\tEnd of Program";
     std::cout <<"\n\n";

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