Preview:
#include <iostream>

using std::cout;
using std::cin;
using std::endl;

int main() 
{
  int  x;
  cout << "Введите ваше число ";
  cin >> x;
    
  if(x < 0)
  {
    x = -x;  
  }

    cout << " Модуль числа равен: " << x;
  
} 
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