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Lilian Besson 2021-01-31 13:56:45 +01:00 committed by GitHub
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@ -233,7 +233,9 @@ int main (int argc, char** argv)
// this notation is scientific notations for numbers: 1e123 = 1*10^123 // this notation is scientific notations for numbers: 1e123 = 1*10^123
// Modulo is there as well, but be careful if arguments are negative // Modulo is there as well, but be careful if arguments are negative
11 % 3; // => 2 11 % 3; // => 2 as 11 = 2 + 3*x (x=3)
(-11) % 3; // => -2, as one would expect
11 % (-3); // => 2 and not -2, and it's quite counter intuitive
// Comparison operators are probably familiar, but // Comparison operators are probably familiar, but
// there is no Boolean type in C. We use ints instead. // there is no Boolean type in C. We use ints instead.
@ -375,8 +377,11 @@ int main (int argc, char** argv)
https://ideone.com/GuPhd6 https://ideone.com/GuPhd6
this will print out "Error occurred at i = 51 & j = 99." this will print out "Error occurred at i = 51 & j = 99."
*/ */
/* it is generally considered bad practice to do so, except if */ /*
/* you really know what you are doing */ it is generally considered bad practice to do so, except if
you really know what you are doing. See
https://en.wikipedia.org/wiki/Spaghetti_code#Meaning
*/
/////////////////////////////////////// ///////////////////////////////////////
// Typecasting // Typecasting
@ -749,12 +754,12 @@ typedef void (*my_fnp_type)(char *);
// Order of Evaluation // Order of Evaluation
/////////////////////////////////////// ///////////////////////////////////////
// From top to bottom, top is has higher precedence // From top to bottom, top has higher precedence
//---------------------------------------------------// //---------------------------------------------------//
// Operators | Associativity // // Operators | Associativity //
//---------------------------------------------------// //---------------------------------------------------//
// () [] -> . | left to right // // () [] -> . | left to right //
// ! ~ ++ -- + = *(type)sizeof | right to left // // ! ~ ++ -- + = *(type) sizeof | right to left //
// * / % | left to right // // * / % | left to right //
// + - | left to right // // + - | left to right //
// << >> | left to right // // << >> | left to right //
@ -832,7 +837,7 @@ Best to find yourself a copy of [K&R, aka "The C Programming Language"](https://
It is *the* book about C, written by Dennis Ritchie, the creator of C, and Brian Kernighan. Be careful, though - it's ancient and it contains some It is *the* book about C, written by Dennis Ritchie, the creator of C, and Brian Kernighan. Be careful, though - it's ancient and it contains some
inaccuracies (well, ideas that are not considered good anymore) or now-changed practices. inaccuracies (well, ideas that are not considered good anymore) or now-changed practices.
Another good resource is [Learn C The Hard Way](http://learncodethehardway.org/c/). Another good resource is [Learn C The Hard Way](http://learncodethehardway.org/c/) (not free).
If you have a question, read the [compl.lang.c Frequently Asked Questions](http://c-faq.com). If you have a question, read the [compl.lang.c Frequently Asked Questions](http://c-faq.com).
@ -842,4 +847,4 @@ Readable code is better than clever code and fast code. For a good, sane coding
Other than that, Google is your friend. Other than that, Google is your friend.
[1] [Why isn't sizeof for a struct equal to the sum of sizeof of each member?](http://stackoverflow.com/questions/119123/why-isnt-sizeof-for-a-struct-equal-to-the-sum-of-sizeof-of-each-member) [1] [Why isn't sizeof for a struct equal to the sum of sizeof of each member?](https://stackoverflow.com/questions/119123/why-isnt-sizeof-for-a-struct-equal-to-the-sum-of-sizeof-of-each-member)