C Programming - MCQ Practice Questions

In C, variable declaration requires a semicolon at the end. The syntax is 'data_type variable_name;'

x++ is post-increment. The value 5 is printed first, then x is incremented to 6.

Following operator precedence, multiplication (*) has higher precedence than addition (+). So 3*2=6, then 5+6=11.

The main() function is the entry point where program execution begins. Every C program must have a main() function.

\t is the escape sequence for a tab character. \n is for newline, \s is invalid in C.

The 'const' keyword creates a constant variable that cannot be modified after initialization. The compiler enforces this at compile time.

arr + 1 points to the second element. Dereferencing with * gives the value 20.

A pointer stores the memory address of a variable. Pointer size depends on the system architecture, not always 4 bytes.

String indexing starts at 0. str[0] = 'H', str[1] = 'e'.

The %d format specifier prints the ASCII value of the character. 'A' has ASCII value 65.

In C, a pointer to an integer is declared using 'int *ptr;' where '*' indicates pointer declaration.

The 'char' data type in C occupies 1 byte of memory and can store a single character.

Variable names in C must start with a letter or underscore, followed by alphanumeric characters or underscores. '_variable123' is valid, while '2variable' starts with digit, 'var-iable' has hyphen, and 'var iable' has space.

The main() function implicitly returns int type, which indicates the program's exit status (0 for success, non-zero for failure).

The escape sequence \n represents a newline character that moves the cursor to the next line.

The size of 'int' is implementation-defined and depends on the compiler and platform, though it is typically 4 bytes on 32-bit systems.

Identifiers cannot start with a digit. They must start with a letter (a-z, A-Z) or underscore.

By C standard, sizeof(char) is always 1 byte, regardless of platform.

%c format specifier prints the character representation of ASCII value 65, which is 'A'.

malloc() and other dynamic memory allocation functions are declared in <stdlib.h>.