What is wrong with using namespace std in C++?

Using namespace std in C++ is wrong when you want a runtime library to be available with your C++ programs. A namespace is a special kind of scope that provides the ability to reuse names. So, using namespace std can make your programs incompatible with other programs which are using namespaces.

using namespace std in c++

By

Breakable Booby on Apr 16, 2020

#include <iostream>

using namespace std;

int main()
{
    cout << "Hello World";
    system("pause");
    return 0;
    
}

Source: www.cplusplus.com

13

using std c++

By

TheGreenOak on Dec 17, 2020

using namespace std;

1

what is namespace in c++

By

Cheerful Crab on Nov 05, 2020

//namespace is a declarative region to provide scope for identifiers
#include <bits/stdc++.h>

using namespace std; //including namespace std for cin and cout
//my custom namespace for variables and functions
namespace abc
{
  void fun()
  {
    cout<<"Hello world"<<endl;
  }
  int x=10;
}
using namespace abc;
int main()
{
  cout<<10;
  fun();
  return 0;
}

0

c++ namespace example

By

Chris24XD on May 01, 2021

#include <iostream>
using namespace std;
namespace square{
	int x;
	int y;
}
int main(){
	using namespace square;
	x = 10;
	y = 0;
	cout << x << y << endl;
}

0

namespace c++

By

Jittery Jellyfish on Jun 14, 2020

Namespace std::cout or cout <<

0

Using namespace std in C++ is a bad practice because it causes potential problems with linkage, usually due to name clashes between modules.

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