diff options
Diffstat (limited to 'c.html.markdown')
| -rw-r--r-- | c.html.markdown | 17 |
1 files changed, 5 insertions, 12 deletions
diff --git a/c.html.markdown b/c.html.markdown index d4ff529d..2fad5348 100644 --- a/c.html.markdown +++ b/c.html.markdown @@ -36,7 +36,6 @@ Multi-line comments don't nest /* Be careful */ // comment ends on this line... enum days {SUN = 1, MON, TUE, WED, THU, FRI, SAT}; // MON gets 2 automatically, TUE gets 3, etc. - // Import headers with #include #include <stdlib.h> #include <stdio.h> @@ -114,7 +113,6 @@ int main (int argc, char** argv) // sizeof(obj) yields the size of the expression (variable, literal, etc.). printf("%zu\n", sizeof(int)); // => 4 (on most machines with 4-byte words) - // If the argument of the `sizeof` operator is an expression, then its argument // is not evaluated (except VLAs (see below)). // The value it yields in this case is a compile-time constant. @@ -130,7 +128,6 @@ int main (int argc, char** argv) int my_int_array[20]; // This array occupies 4 * 20 = 80 bytes // (assuming 4-byte words) - // You can initialize an array to 0 thusly: char my_array[20] = {0}; @@ -146,9 +143,9 @@ int main (int argc, char** argv) // can be declared as well. The size of such an array need not be a compile // time constant: printf("Enter the array size: "); // ask the user for an array size - int size; - fscanf(stdin, "%d", &size); - int var_length_array[size]; // declare the VLA + int array_size; + fscanf(stdin, "%d", &array_size); + int var_length_array[array_size]; // declare the VLA printf("sizeof array = %zu\n", sizeof var_length_array); // Example: @@ -347,7 +344,6 @@ int main (int argc, char** argv) this will print out "Error occured at i = 52 & j = 99." */ - /////////////////////////////////////// // Typecasting /////////////////////////////////////// @@ -386,7 +382,6 @@ int main (int argc, char** argv) // (%p formats an object pointer of type void *) // => Prints some address in memory; - // Pointers start with * in their declaration int *px, not_a_pointer; // px is a pointer to an int px = &x; // Stores the address of x in px @@ -432,7 +427,6 @@ int main (int argc, char** argv) printf("%zu, %zu\n", sizeof arraythethird, sizeof ptr); // probably prints "40, 4" or "40, 8" - // Pointers are incremented and decremented based on their type // (this is called pointer arithmetic) printf("%d\n", *(x_ptr + 1)); // => Prints 19 @@ -578,8 +572,6 @@ void testFunc2() { } //**You may also declare functions as static to make them private** - - /////////////////////////////////////// // User-defined types and structs /////////////////////////////////////// @@ -696,6 +688,7 @@ typedef void (*my_fnp_type)(char *); "%o"; // octal "%%"; // prints % */ + /////////////////////////////////////// // Order of Evaluation /////////////////////////////////////// @@ -786,4 +779,4 @@ Readable code is better than clever code and fast code. For a good, sane coding Other than that, Google is your friend. -[1] http://stackoverflow.com/questions/119123/why-isnt-sizeof-for-a-struct-equal-to-the-sum-of-sizeof-of-each-member +[1] http://stackoverflow.com/questions/119123/why-isnt-sizeof-for-a-struct-equal-to-the-sum-of-sizeof-of-each-member
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