Why Use `` Over `` in C ?

Using C Headers in C : Namespace Considerations

In C , the use of C headers raises a question regarding namespace usage. While C functions and headers can be employed in C after minor modifications, the syntax remains ambiguous with both printf("Hello world!") and std::printf("Hello world!") producing the same output.

Namespace Behavior in C 11

According to the C 11 Standard, C headers like name.h introduce names both in the global namespace and the std namespace. However, the declaration order within each namespace is unspecified.

For example, the header ensures that declarations and definitions are placed within std, while provides them in the global namespace as well.

Recommended Practice

Given that using headers is deprecated, it is advisable to adhere to the following guidelines:

• Include headers for standard library functionality.
• Use declarations and definitions from the std namespace.

Example

Prefer the following code:

#include <cstdio>

int main() {
    std::printf("Hello world\n");
}

Avoid this code:

#include <stdio.h>

int main() {
    printf("Hello world\n");
}

By adhering to these practices, C code ensures consistency, clarity, and compliance with the latest C Standards.

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