C Reserved words - C Language keywords

C Reserved words - C keywords

Also called: C Language Keywords, C Reserved Keywords, C Keywords, C Reserved Identifiers, C Reserved words

VERIFY C Language Keyword, C Reserved Keyword, C Keyword, C Reserved Identifier, C Reserved word

Creating a glossary of the top 60 C language reserved words sorted by their most common usage involves a subjective analysis, as the frequency of use can vary depending on the type of projects. However, we can focus on a set of keywords that are foundational to C programming, including control flow, type specification, storage class specifiers, and more. It's important to note that the C language has fewer reserved words compared to more verbose languages, with the standard specifying only 32 keywords (as of C99), so we'll cover these essential keywords and their usage.

Here's an attempt to outline these reserved words in C, formatted in MediaWiki markup:

```mediawiki

This glossary lists some of the most frequently used reserved words in the C programming language, along with short code examples to illustrate their usage.

Used for conditional branching.

if (x > 0) {
    printf("x is positive\n");
}

Specifies an alternative sequence of commands.

if (x > 0) {
    printf("x is positive\n");
} else {
    printf("x is not positive\n");
}

Introduces a loop that continues as long as the condition is true.

while (x < 5) {
    printf("%d\n", x);
    x++;
}

Specifies a loop with initialization, condition, and increment/decrement in one place.

for (int i = 0; i < 5; i++) {
    printf("%d\n", i);
}

Exits a function and optionally returns a value.

int add(int x, int y) {
    return x + y;
}

Specifies that a function does not return a value.

void printHello() {
    printf("Hello, World!\n");
}

Declares integer type variables.

int x = 5;

Declares floating-point type variables.

float y = 5.5;

Declares double-precision floating-point type variables.

double z = 5.555;

Declares character type variables.

char letter = 'A';

Declares a variable whose value cannot be changed.

const int MAX = 100;

Defines an enumeration, a set of named integer constants.

enum boolean { NO, YES };

Defines a structure type.

struct Point {
    int x;
    int y;
};

Defines a union, a structure in which all members share the same memory location.

union Data {
    int i;
    float f;
    char str[20];
};

Implements a multiway branch.

switch (x) {
    case 1:
        printf("One\n");
        break;
    case 2:
        printf("Two\n");
        break;
    default:
        printf("Other\n");
}

Defines an individual branch in a switch statement.

case 1:
    printf("One\n");
    break;

Specifies the default branch in a switch statement.

default:
    printf("Default\n");

Exits the nearest enclosing loop or switch statement.

break;

Skips the rest of the loop iteration and proceeds with the next iteration.

continue;

Introduces a loop that executes at least once and repeats as long as the condition is true.

do {
    printf("%d\n", x);
    x++;
} while (x < 5);

Creates a new type name for an existing type.

typedef unsigned char BYTE;

Specifies that a variable or function is local to its file.

static int count = 0;

Declares a global variable or function that is defined in another file.

extern int x;

Returns the size of a type or variable.

sizeof(int);

Indicates that a variable may be changed in ways not explicitly specified by the program.

volatile int x;

Suggests that the compiler use a CPU register for storing the variable for faster access.

register int counter;

Declares a variable with automatic storage duration (rarely used explicitly, as it's the

default).

auto int x;

Jumps to a labeled position within the function.

goto label;
label: printf("Jumped to label\n");

This list covers the fundamental reserved words in C programming, suitable for beginners and those seeking to refresh their knowledge. The concise nature of C, with its limited set of keywords, underscores the language's efficiency and directness for system-level programming. ```

This format is designed for easy inclusion in a wiki page focusing on C programming, providing newcomers and experienced programmers alike with quick insights into essential language features along with examples to kickstart or deepen their understanding.

Snippet from Wikipedia: Z

Z, or z, is the twenty-sixth and last letter of the Latin alphabet. It is used in the modern English alphabet, in the alphabets of other Western European languages, and in others worldwide. Its usual names in English are zed (), which is most commonly used in British English and [[English alphabet# with the latter being preferred in written English.</ref>, with an occasional archaic variant izzard ().

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