Why is "using namespace std;" considered bad practice?

Question

Aryan Kumar · Answer

Using the namespace std is considered bad practice because it can make your code less readable and less maintainable. When you use the
namespace std, you are importing all of the names from the std namespace into the current namespace. This can make it difficult to determine where a particular name is coming from, and it can also make it difficult to find the definition of a particular name.
For example, consider the following code:
C++
#include andlt;iostream>
int main() {
  std::cout andlt;andlt; "Hello, world!";
  return 0;
}
In this code, the cout object is being used to print the text "Hello, world!" to the console. The
cout object is defined in the std namespace, so when we use it in our code, we are actually using the
std::cout object.
However, if we use the namespace std directive, we can simplify our code as follows:
C++
#include andlt;iostream>
using namespace std;
int main() {
  cout andlt;andlt; "Hello, world!";
  return 0;
}
In this code, we are importing all of the names from the std namespace into the current namespace. This means that we can now use the
cout object without having to prefix it with the std:: namespace qualifier.
While this may seem like a convenient way to write code, it can actually make your code less readable and less maintainable. If you are using the
namespace std, it can be difficult to determine where a particular name is coming from. For example, if you see the code
cout andlt;andlt; "Hello, world!", you may not know if the cout object is defined in the current namespace or in the
std namespace.
Additionally, using the namespace std can make it difficult to find the definition of a particular name. If you are trying to find the definition of the
cout object, you will need to search through the std namespace. This can be time-consuming and error-prone.
For these reasons, it is generally considered bad practice to use the namespace std. If you need to use names from the
std namespace, it is better to prefix them with the std:: namespace qualifier. This will make your code more readable and more maintainable.

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Why is "using namespace std;" considered bad practice?

Utpal Vishwas

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