Loop Do...while

              
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#include <iostream>

int main()
{
	int variable = 0;

	//loop never executed
	while (variable == 1)
	{
		std::cout << "Hello, I am while loop!" << std::endl;
	}

	std::cout << "While loop didn't start :(" << std::endl;
}

              
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#include <iostream>

int main()
{
	int variable = 0;

	do
  	{
		// this line is guaranteed to be execute at least once
		std::cout << "Hello, I am Do-Block!" << std::endl; 
	}

	while (variable == 5); // loop continuation condition

	std::cout << "Variable doesn`t equal 5, ";
	std::cout << "so the loop didn't work, "; 
	std::cout << "only the do-block." << std::endl;
}