Query related to cstdio and stdio.h

[isaisa]

hi all
i was going through C++ programming language -Stroustrup. I am confused in the header files that are mentioned for C linkage and normal stdio.h files.
The documentation says the following.

   //cstdio
    
   namespace std {
         void printf(const char*,...);
         /*Std C function declaration here */
   }

   //stdio.h

   #include <cstdio>
   using namespace std;

i am not getting the purpose and difference between the two header files. Can anybody help me in understanding ?

Further reading was related to the extern "C" directive in the same book. I am not able to understand the same , if anybody can help me.

thanks in advance
sanjay

 

[cpjust]

They're exactly the same, except in <cstdio> (or <cstdlib>, <cmath>...) all the functions that were in the global namespace are now in the std namespace. The purpose of which is to reduce the possibility of namespace conflicts.

So if you include <stdio.h>, you just need to call: printf("...");
but if you include <cstdio>, you need to call: std:rintf("...");