bf(C++) uses very strict i(type checking). A prototype must be known for each
function before it is called, and the call must match the prototype.
The program
        verb(
    int main()
    {
        printf("Hello World\n");
    }
        )
    does often compile under bf(C), though with a warning that ti(printf()) is
not a known function. Many bf(C++) compilers will fail to produce code in such
a situation. The error is of course the missing ti(#include <stdio.h>)
directive.

    Although, while we're at it: in bf(C++) the function ti(main()) em(always)
uses the tt(int) i(return value). It is possible to define ti(int main())
without an i(explicit return) statement, but a ti(return) statement without an
expression cannot be given inside the tt(main()) function: a tt(return)
statement in tt(main()) must always be given an tt(int)-expression. For
example:
        verb(
    int main()
    {
        return;     // won't compile: expects int expression
    }
        )