todays computers are far more advanced than PDP-11 but even today our smartest developers (see above) cant even figure out what a pointer is. A lot of programmers who have worked 10 years have 1 year of experience 10 times. Honestly, its kind of weird that the C spec allows it. A union is a type consisting of a sequence of members whose storage overlaps (as opposed to struct, which is a type consisting of a sequence of members whose storage is allocated in an ordered sequence). Usually the bug isnt because you remembered wrong, but because since you presumed your memory to mean you got it right, you then wrote an excessively complex construction where it is easy to slip and write it out wrong. It depends. See http://c-faq.com/null/varieties.html. ptrdiff_t is printed with %td, not %ld. Since such a variable cannot be larger than 32 bits in size, the difference must also fit into 32 bits. Every language has things you can bicker and squabble over. ****************************************************** (Actually, I had to instruct a programmer how to do it he was initially very much against such a bizarre concept. It should be: One of them are C compilers for the 8051. Trying anything other than addition with an integer, or subtraction with either an integer or another pointer of the same type will result in a compiler error. This blog has questionable quality. C is a lot like English; the language allows you to do almost anything, and very little of what people consider harmful is actually a literal mistake; instead, people adopt various style guides to try to keep themselves in line. If ptr points to an integer, ptr + 1 is the address of the next integer in memory after ptr.ptr - 1 is the address of the previous integer before ptr.. the cast, although allowing a compile without complaining, is simply masking a problem. For Example: if an array named arr then arr and &arr[0] can be used to reference array as a pointer. If for some reason you wanted to extract whatever resides 11 bytes into a struct arrays third element and turn it into a float, *((float *) ((char *) (struct_array + 2) + 11)) will get you there. Below is the implementation to illustrate the Subtraction of Two Pointers: Pointer Arithmetic on Arrays:Pointers contain addresses.
Platinum Purple Cookies Strain,
Brian Shaw College Basketball Highlights,
Jds Multi Router For Sale Craigslist,
Judah Akers Family,
Celebrities Who Live In Stuart Fl,
Articles C
