D is an elegant re-imagine of C and C++. For a trivial example,

    typedef struct S { int a; } S;

becomes simply:

    struct S { int a; }

and unlike C:

    extern int foo();
    int bar() { return foo(); }
    int foo() { return 6; }

you have:

    int bar() { return foo(); }
    int foo() { return 6; }

For more complex things:

    #include <foo.h>

becomes:

    import foo;