So I am using a while loop and my problem happens when I try and run this code in an online compiler which doesn't have input, it keep looping forever and doesn't wait for input. Is there a way I can force it to wait ?

Please note that it works perfect with Code blocks ide.

```
#include <iostream>
#include <stdlib.h>
int main()
{
system("COLOR A");
bool repeat = true;
int v1 = 0, v2 = 0;
std::string sum = "sum", subtract = "subtract", multiply = "multiply", divide = "divide", exponentiation = "exponentiation", squareroot = "squareroot", polynomials = "polynomials", exit = "exit";
std::string check;
while(repeat == true)
{
std::cout << "Choose what you want to do by typing any of the following: ";
std::cout << sum << " , " << subtract << " , " << multiply << " , " << divide << " , " << exponentiation << " , " << squareroot << " , " << polynomials << " , " << exit << "." << std::endl;
std::cin >> check;
if(check == sum)
{
std::cout << "Enter the numbers you want to " << sum << " and press enter." << std::endl;
std::cin >> v1 >> v2;
std::cout << "Result is " << v1 + v2 << std::endl;
}
if(check == subtract)
{
std::cout << "Enter the numbers you want to " << subtract << " and press enter." << std::endl;
std::cin >> v1 >> v2;
std::cout << "Result is " << v1 - v2 << std::endl;
}
if(check == multiply)
{
std::cout << "Enter the numbers you want to " << multiply << " and press enter." << std::endl;
std::cin >> v1 >> v2;
std::cout << "Result is " << v1 * v2 << std::endl;
}
if(check == divide)
{
std::cout << "Enter the numbers you want to " << divide << " and press enter." << std::endl;
std::cin >> v1 >> v2;
std::cout << "Result is " << v1 / v2 << std::endl;
}
if(check == polynomials)
{
std::cout << "Type what kind of polynomial you wil use: " << std::endl;
std::string linear = "linear", quadratic = "quadratic", cubic = "cubic", quartic = "quartic";
std::cout << linear << " , " << quadratic << " , " << cubic << " , " << quartic << std::endl;
std::cin >> check;
{
if(check == linear)
{
std::cout << "Type what do you want to preform on the polynomials: " << std::endl;
std::string multiply = "multiply", divide = "divide", sum = "sum", subtract = "subtract", exit = "exit";
std:: cout << multiply << " , " << divide << " , " << sum << " , " << subtract << " , " << exit << "." << std::endl;
std::cin >> check;
int leadingcoefficient = 0, constantterm = 0;
int leadingcoefficienttwo = 0, constanttermtwo = 0;
std::string sign;
std::string signtwo;
if(check == sum)
{
std::cout << "Type your first linear polynomial numbers starting with the leading coefficient leaving spaces. Example : 4 x +3 And then press enter. " << std::endl;
std::cin >> leadingcoefficient >> sign >> constantterm;
std::cout << "Type your second linear polynomial numbers starting with the leading coefficient leaving spaces. Example : 3 x -9 And then press enter. " << std::endl;
std::cin >> leadingcoefficienttwo >> signtwo >> constanttermtwo;
if(sign == signtwo)
{
if(constantterm + constanttermtwo > 0)
{
std::cout << "Result is " << leadingcoefficient + leadingcoefficienttwo << " " << sign << " + " << constantterm + constanttermtwo << std::endl;
}
if(constantterm + constanttermtwo < 0)
{
std::cout << "Result is " << leadingcoefficient + leadingcoefficienttwo << " " << sign << " " << constantterm + constanttermtwo << std::endl;
}
if(constantterm + constanttermtwo == 0)
{
std::cout << "Result is " << leadingcoefficient + leadingcoefficienttwo << " " << sign << std::endl;
}
}
else
{
std::cout << "Your linear polynomials can't be added as " << sign << " of first linear isn't equal to " << signtwo << " of the second linear" << std::endl;
}
}
if(check == subtract)
{
std::cout << "Type your first linear polynomial numbers starting with the leading coefficient leaving spaces. Example : 4 x +3 And then press enter. " << std::endl;
std::cin >> leadingcoefficient >> sign >> constantterm;
std::cout << "Type your second linear polynomial numbers starting with the leading coefficient leaving spaces. Example : 3 x -9 And then press enter. " << std::endl;
std::cin >> leadingcoefficienttwo >> signtwo >> constanttermtwo;
if(sign == signtwo)
{
if(constantterm - constanttermtwo == 0)
{
std::cout << "Result is " << leadingcoefficient - leadingcoefficienttwo << " " << sign << std::endl;
}
if(constantterm - constanttermtwo > 0)
{
std::cout << "Result is " << leadingcoefficient - leadingcoefficienttwo << " " << sign << " + " << constantterm - constanttermtwo << std::endl;
}
if(constantterm - constanttermtwo < 0)
{
std::cout << "Result is " << leadingcoefficient - leadingcoefficienttwo << " " << sign << " " << constantterm - constanttermtwo << std::endl;
}
}
else
{
std::cout << "Your linear polynomials can't be subtracted as " << sign << " of first linear isn't equal to " << signtwo << " of the second linear" << std::endl;
}
}
}
}
}
if(check == squareroot)
{
std::cout << "Enter the number you want sqaured and press enter. " << std::endl;
float input = 0, multiplier = 0;
std::cin >> input;
if(input >= 0)
{
multiplier = input;
while(multiplier != (input * input))
{
input--;
}
std::cout << "Result is " << input << std::endl;
}
else
{
std::cout << "You can't get a squareroot for a negative number! Math Error. " << std::endl;
}
}
if(check == exponentiation)
{
std::cout << "Enter the numbers by which the first is the base and second is the index." << std::endl;
std::cin >> v1 >> v2;
float holder = v1;
int i = v2;
if(i > 0)
{
while(i > 1)
{
i--;
holder *= v1;
}
}
if(i < 0)
{
holder = 1/holder;
while(i < -1)
{
i++;
holder /= v1;
}
}
if(i == 0)
{
holder = 0;
}
std::cout << "Result is " << holder << std::endl;
}
if(check == exit)
{
repeat = false;
}
}
return 0;
}
```