Is it good practice to use and include <limits>? - c++

Question

I have validated cin input by using std::numeric_limits and thus I need to include <limits>.
Will this effect the functionality of my Program?
I have been reading so many comments on different forums that using <limits> is not a good practice, but nobody cleared stated why it is not a good practice. If it is really a bad practice, what is a good practice to validate cin input for known errors, such as invalid inputs and long inputs?
#include <iostream>
#include <limits>
using namespace std;
void initMenu ();
void initDecision(int);
double areaCircle (double);
double areaRectangle (double, double);
const double PI = 4.14;
bool isValid (string);
int main()
{
int choice;
char cont;
do
{
system ("cls");
initMenu ();
while (!(cin >> choice))
{
cin.clear();
system ("cls");
initMenu();
cout << "---------------------------------------------------------------------------" << '\n';
cout << "Invalid Input cleared and turns to [" << cin.rdstate() << "] you can try it again or go to school" << '\n';
cout << "---------------------------------------------------------------------------" << '\n';
cin.ignore(numeric_limits<streamsize>::max(), '\n');
}
initDecision (choice);
do
{
cin.clear();
cout << "" << '\n';
cout << "------------------------------------------------" << '\n';
cout << "Do you want to continue using the Program? [Y/n]" << '\n';
cout << "------------------------------------------------" << '\n';
cin >> cont;
cin.ignore(numeric_limits<streamsize>::max(), '\n');
}
while (cont != 'Y' && cont != 'y' && cont != 'N' && cont != 'n' );
system ("cls");
cout << "-------------------------------" << '\n';
cout << "Thank you for using our Program" << '\n';
cout << "-------------------------------" << '\n';
}
while (cont == 'Y' || cont == 'y');
return 0;
}
void initMenu()
{
cout << "-------------------------------------------------" << '\n';
cout << "Choose any one option from above! [1] [2] [3] [4]" << '\n';
cout << "-------------------------------------------------" << '\n';
cout << "1 Circle" << '\n';
cout << "2 Rectangle" << '\n';
}
void initDecision(int choice)
{
double r, a, b, h;
switch (choice)
{
case 1:
cout << "Enter the Radius of a Circle: " << '\n';
do {cin >> r;} while (!isValid("Wrong Input detected, Try again!"));
areaCircle(r);
break;
case 2:
cout << "Enter Base and Height of a Rectangle: " << '\n';
do {cin >> b >> h;} while (!isValid("Wrong Input detected, Try again!"));
areaRectangle(b ,h);
break;
default:
cout << "----------------------------------------------------------------------" << '\n';
cout << "The option is out of bound, Check and try again with available options" << '\n';
cout << "----------------------------------------------------------------------" << '\n';
break;
}
}
double areaCircle (double r)
{
double result = PI * r * r;
cout << "The area of a circle that has value: [" << r << "] = [" << result << "]" << '\n';
return result;
}
double areaRectangle (double b, double h)
{
double result = b * h;
cout << "Rectangle with Base value: [" << b << "] and value of Height: [" << h << "] = [" << result << "]" << '\n';
return result;
}
bool isValid (string error_msg)
{
if(cin.rdstate())
{
cin.clear();
cin.ignore(numeric_limits<streamsize>::max() , '\n');
system("cls");
initMenu();
cout << error_msg << '\n';
return false;
}
return true;
}