From 3b1940b9cc9c0e46a9275b2ae64e4c5996d7de75 Mon Sep 17 00:00:00 2001 From: Alex Luehm Date: Wed, 28 Oct 2015 17:45:31 -0500 Subject: [C/en] Added tidbit about fall-though in switch statements. Another pitfall, as not all languages have fall-through in switches. --- c.html.markdown | 24 +++++++++++++++--------- 1 file changed, 15 insertions(+), 9 deletions(-) (limited to 'c.html.markdown') diff --git a/c.html.markdown b/c.html.markdown index 3d632eab..2a5e460f 100644 --- a/c.html.markdown +++ b/c.html.markdown @@ -76,7 +76,7 @@ int main (int argc, char** argv) /////////////////////////////////////// // Types /////////////////////////////////////// - + // All variables MUST be declared at the top of the current block scope // we declare them dynamically along the code for the sake of the tutorial @@ -318,6 +318,12 @@ int main (int argc, char** argv) case 1: printf("Huh, 'a' equals 1!\n"); break; + // Be careful - without a "break", execution continues until the + // next "break" is reached. + case 3: + case 4: + printf("Look at that.. 'a' is either 3, or 4\n"); + break; default: // if `some_integral_expression` didn't match any of the labels fputs("error!\n", stderr); @@ -345,8 +351,8 @@ int main (int argc, char** argv) https://ideone.com/GuPhd6 this will print out "Error occured at i = 52 & j = 99." */ - - + + /////////////////////////////////////// // Typecasting /////////////////////////////////////// @@ -445,7 +451,7 @@ int main (int argc, char** argv) for (xx = 0; xx < 20; xx++) { *(my_ptr + xx) = 20 - xx; // my_ptr[xx] = 20-xx } // Initialize memory to 20, 19, 18, 17... 2, 1 (as ints) - + // Note that there is no standard way to get the length of a // dynamically allocated array in C. Because of this, if your arrays are // going to be passed around your program a lot, you need another variable @@ -721,13 +727,13 @@ typedef void (*my_fnp_type)(char *); /******************************* Header Files ********************************** -Header files are an important part of c as they allow for the connection of c -source files and can simplify code and definitions by seperating them into +Header files are an important part of c as they allow for the connection of c +source files and can simplify code and definitions by seperating them into seperate files. -Header files are syntaxtically similar to c source files but reside in ".h" -files. They can be included in your c source file by using the precompiler -command #include "example.h", given that example.h exists in the same directory +Header files are syntaxtically similar to c source files but reside in ".h" +files. They can be included in your c source file by using the precompiler +command #include "example.h", given that example.h exists in the same directory as the c file. */ -- cgit v1.2.3 From 7560ea819965604099a3ed1dbf4e2fa8919e929b Mon Sep 17 00:00:00 2001 From: George Gognadze Date: Thu, 24 Dec 2015 23:24:09 +0400 Subject: typo MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit some type mistakes. It is: syntaxtically It should be: syntactically It is: iLoveC Better: ILoveC It is: passed to ≈the function It should be: passed to the function It is: error It should be: Error --- c.html.markdown | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) (limited to 'c.html.markdown') diff --git a/c.html.markdown b/c.html.markdown index 8226ddef..d92d2ee6 100644 --- a/c.html.markdown +++ b/c.html.markdown @@ -239,7 +239,7 @@ int main (int argc, char** argv) z = (e > f) ? e : f; // => 10 "if e > f return e, else return f." // Increment and decrement operators: - char *s = "iLoveC"; + char *s = "ILoveC"; int j = 0; s[j++]; // => "i". Returns the j-th item of s THEN increments value of j. j = 0; @@ -321,7 +321,7 @@ int main (int argc, char** argv) break; default: // if `some_integral_expression` didn't match any of the labels - fputs("error!\n", stderr); + fputs("Error!\n", stderr); exit(-1); break; } @@ -497,7 +497,7 @@ int add_two_ints(int x1, int x2) /* Functions are call by value. When a function is called, the arguments passed to -≈the function are copies of the original arguments (except arrays). Anything you +the function are copies of the original arguments (except arrays). Anything you do to the arguments in the function do not change the value of the original argument where the function was called. @@ -726,7 +726,7 @@ Header files are an important part of c as they allow for the connection of c source files and can simplify code and definitions by seperating them into seperate files. -Header files are syntaxtically similar to c source files but reside in ".h" +Header files are syntactically similar to c source files but reside in ".h" files. They can be included in your c source file by using the precompiler command #include "example.h", given that example.h exists in the same directory as the c file. -- cgit v1.2.3