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[C/en] Added tidbit about fall-though in switch statements.

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Another pitfall, as not all languages have fall-through in switches.
This commit is contained in:
Alex Luehm 2015-10-28 17:45:31 -05:00
parent 927ac9c3e8
commit 3b1940b9cc
1 changed files with 15 additions and 9 deletions
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@ -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.
*/