diff options
Diffstat (limited to 'c.html.markdown')
| -rw-r--r-- | c.html.markdown | 30 |
1 files changed, 15 insertions, 15 deletions
diff --git a/c.html.markdown b/c.html.markdown index c89f2b88..22f251f2 100644 --- a/c.html.markdown +++ b/c.html.markdown @@ -23,7 +23,7 @@ Multi-line comments look like this. They work in C89 as well. // Constants: #define <keyword> #define DAYS_IN_YEAR 365 -//enumeration constants are also ways to declare constants. +// Enumeration constants are also ways to declare constants. enum days {SUN = 1, MON, TUE, WED, THU, FRI, SAT}; // MON gets 2 automatically, TUE gets 3, etc. @@ -96,7 +96,7 @@ int main() { // is not evaluated (except VLAs (see below)). // The value it yields in this case is a compile-time constant. int a = 1; - // size_t is an unsiged integer type of at least 2 bytes used to represent + // size_t is an unsigned integer type of at least 2 bytes used to represent // the size of an object. size_t size = sizeof(a++); // a++ is not evaluated printf("sizeof(a++) = %zu where a = %d\n", size, a); @@ -135,9 +135,9 @@ int main() { // > Enter the array size: 10 // > sizeof array = 40 - // Strings are just arrays of chars terminated by a NUL (0x00) byte, + // Strings are just arrays of chars terminated by a NULL (0x00) byte, // represented in strings as the special character '\0'. - // (We don't have to include the NUL byte in string literals; the compiler + // (We don't have to include the NULL byte in string literals; the compiler // inserts it at the end of the array for us.) char a_string[20] = "This is a string"; printf("%s\n", a_string); // %s formats a string @@ -182,7 +182,7 @@ int main() { 11 % 3; // => 2 // 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. // (Or _Bool or bool in C99.) // 0 is false, anything else is true. (The comparison // operators always yield 0 or 1.) @@ -281,7 +281,7 @@ int main() { // branching with multiple choices: switch() switch (some_integral_expression) { - case 0: // labels need to be integral *constant* epxressions + case 0: // labels need to be integral *constant* expressions do_stuff(); break; // if you don't break, control flow falls over labels case 1: @@ -312,7 +312,7 @@ int main() { // Types will overflow without warning printf("%d\n", (unsigned char) 257); // => 1 (Max char = 255 if char is 8 bits long) - // For determining the max value of a `char`, a `signed char` and an `unisigned char`, + // For determining the max value of a `char`, a `signed char` and an `unsigned char`, // respectively, use the CHAR_MAX, SCHAR_MAX and UCHAR_MAX macros from <limits.h> // Integral types can be cast to floating-point types, and vice-versa. @@ -342,13 +342,13 @@ int main() { // => Prints "8, 4" on a typical 64-bit system // To retrieve the value at the address a pointer is pointing to, - // put * in front to de-reference it. + // put * in front to dereference it. // Note: yes, it may be confusing that '*' is used for _both_ declaring a // pointer and dereferencing it. printf("%d\n", *px); // => Prints 0, the value of x // You can also change the value the pointer is pointing to. - // We'll have to wrap the de-reference in parenthesis because + // We'll have to wrap the dereference in parenthesis because // ++ has a higher precedence than *. (*px)++; // Increment the value px is pointing to by 1 printf("%d\n", *px); // => Prints 1 @@ -532,7 +532,7 @@ int area(const rect *r) // Function pointers /////////////////////////////////////// /* -At runtime, functions are located at known memory addresses. Function pointers are +At run time, functions are located at known memory addresses. Function pointers are much like any other pointer (they just store a memory address), but can be used to invoke functions directly, and to pass handlers (or callback functions) around. However, definition syntax may be initially confusing. @@ -542,7 +542,7 @@ Example: use str_reverse from a pointer void str_reverse_through_pointer(char *str_in) { // Define a function pointer variable, named f. void (*f)(char *); // Signature should exactly match the target function. - f = &str_reverse; // Assign the address for the actual function (determined at runtime) + f = &str_reverse; // Assign the address for the actual function (determined at run time) // f = str_reverse; would work as well - functions decay into pointers, similar to arrays (*f)(str_in); // Just calling the function through the pointer // f(str_in); // That's an alternative but equally valid syntax for calling it. @@ -564,10 +564,10 @@ typedef void (*my_fnp_type)(char *); '\n' // newline character '\t' // tab character (left justifies text) '\v' // vertical tab -'\f' // new page (formfeed) +'\f' // new page (form feed) '\r' // carriage return '\b' // backspace character -'\0' // null character. Usually put at end of strings in C lang. +'\0' // NULL character. Usually put at end of strings in C. // hello\n\0. \0 used by convention to mark end of string. '\\' // backslash '\?' // question mark @@ -586,7 +586,7 @@ typedef void (*my_fnp_type)(char *); "%7.4s" // (can do with strings too) "%c" // char "%p" // pointer -"%x" // hexidecimal +"%x" // hexadecimal "%o" // octal "%%" // prints % @@ -628,7 +628,7 @@ If you have a question, read the [compl.lang.c Frequently Asked Questions](http: It's very important to use proper spacing, indentation and to be consistent with your coding style in general. Readable code is better than clever code and fast code. For a good, sane coding style to adopt, see the -[Linux kernel coding stlye](https://www.kernel.org/doc/Documentation/CodingStyle). +[Linux kernel coding style](https://www.kernel.org/doc/Documentation/CodingStyle). Other than that, Google is your friend. |