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#include <iostream>
using namespace std;
class Int
{
	int x;
	Int(int x)
	{
		this.x = x;
	}
	String toString(Int y)
	{
		return y.x.toString();
	}
	Int plus(Int y)
	{
		Int temp;
		temp.x = this.x + y.x;
		return temp;
	}
	Int minus(Int y)
	{
		Int temp;
		temp.x = this.x - y.x;
		return temp;
	}
	Int times(Int y)
	{
		Int temp;
		temp.x = this.x * y.x;
		return temp;
	}
	Int div(Int y)
	{
		Int temp;
		if(y.x!=0)
		{
			temp.x = this.x/y.x;
			return temp;
		}
		return null;
	}
	bool isPrime(Int y)
	{
		for(int i=2;i<=sqrt(y.x);i++)
		{
			if(y.x%i==0)return false;
		}
		return true;
	}
int main() {
	// your code goes here
	return 0;
}

prog.cpp:10:2: error: ‘String’ does not name a type
  String toString(Int y)
  ^
prog.cpp:53:1: error: expected ‘}’ at end of input
 }
 ^
prog.cpp: In constructor ‘Int::Int(int)’:
prog.cpp:8:8: error: request for member ‘x’ in ‘this’, which is of pointer type ‘Int* const’ (maybe you meant to use ‘->’ ?)
   this.x = x;
        ^
prog.cpp: In member function ‘Int Int::plus(Int)’:
prog.cpp:16:7: error: no matching function for call to ‘Int::Int()’
   Int temp;
       ^
prog.cpp:16:7: note: candidates are:
prog.cpp:6:2: note: Int::Int(int)
  Int(int x)
  ^
prog.cpp:6:2: note:   candidate expects 1 argument, 0 provided
prog.cpp:3:7: note: Int::Int(const Int&)
 class Int
       ^
prog.cpp:3:7: note:   candidate expects 1 argument, 0 provided
prog.cpp:17:17: error: request for member ‘x’ in ‘this’, which is of pointer type ‘Int* const’ (maybe you meant to use ‘->’ ?)
   temp.x = this.x + y.x;
                 ^
prog.cpp: In member function ‘Int Int::minus(Int)’:
prog.cpp:22:7: error: no matching function for call to ‘Int::Int()’
   Int temp;
       ^
prog.cpp:22:7: note: candidates are:
prog.cpp:6:2: note: Int::Int(int)
  Int(int x)
  ^
prog.cpp:6:2: note:   candidate expects 1 argument, 0 provided
prog.cpp:3:7: note: Int::Int(const Int&)
 class Int
       ^
prog.cpp:3:7: note:   candidate expects 1 argument, 0 provided
prog.cpp:23:17: error: request for member ‘x’ in ‘this’, which is of pointer type ‘Int* const’ (maybe you meant to use ‘->’ ?)
   temp.x = this.x - y.x;
                 ^
prog.cpp: In member function ‘Int Int::times(Int)’:
prog.cpp:28:7: error: no matching function for call to ‘Int::Int()’
   Int temp;
       ^
prog.cpp:28:7: note: candidates are:
prog.cpp:6:2: note: Int::Int(int)
  Int(int x)
  ^
prog.cpp:6:2: note:   candidate expects 1 argument, 0 provided
prog.cpp:3:7: note: Int::Int(const Int&)
 class Int
       ^
prog.cpp:3:7: note:   candidate expects 1 argument, 0 provided
prog.cpp:29:17: error: request for member ‘x’ in ‘this’, which is of pointer type ‘Int* const’ (maybe you meant to use ‘->’ ?)
   temp.x = this.x * y.x;
                 ^
prog.cpp: In member function ‘Int Int::div(Int)’:
prog.cpp:34:7: error: no matching function for call to ‘Int::Int()’
   Int temp;
       ^
prog.cpp:34:7: note: candidates are:
prog.cpp:6:2: note: Int::Int(int)
  Int(int x)
  ^
prog.cpp:6:2: note:   candidate expects 1 argument, 0 provided
prog.cpp:3:7: note: Int::Int(const Int&)
 class Int
       ^
prog.cpp:3:7: note:   candidate expects 1 argument, 0 provided
prog.cpp:37:18: error: request for member ‘x’ in ‘this’, which is of pointer type ‘Int* const’ (maybe you meant to use ‘->’ ?)
    temp.x = this.x/y.x;
                  ^
prog.cpp:40:10: error: ‘null’ was not declared in this scope
   return null;
          ^
prog.cpp: In member function ‘bool Int::isPrime(Int)’:
prog.cpp:44:26: error: ‘sqrt’ was not declared in this scope
   for(int i=2;i<=sqrt(y.x);i++)
                          ^
prog.cpp: At global scope:
prog.cpp:53:1: error: expected unqualified-id at end of input
 }
 ^

Standard output is empty