citix:/home/xitron/C# cat hello.c 
#include <iostream>

main()
{
        std::cout << "Hello, World\n" << std::endl;
}
error:
citix:/home/xitron/C# gcc hello.c 
hello.c:1:19: error: stdio.h: No such file or directory
hello.c: In function ‘main’:
hello.c:5: warning: incompatible implicit declaration of built-in function ‘printf’