C Basics — Practice MCQs for CCAT

Correct Answer: A — Dennis Ritchie

C was developed by Dennis Ritchie at Bell Labs in the early 1970s.

Correct Answer: A — UNIX

C was developed to write the UNIX operating system.

Correct Answer: A — C89

C89 (ANSI C) is one of the official C language standards.

Correct Answer: C — boolean

C does not have a built-in boolean keyword.

Correct Answer: B — char

char data type is used to store a single character.

Correct Answer: B — 4 bytes

On most modern systems, int occupies 4 bytes.

Correct Answer: B — long

The long modifier increases the size/range of integer.

Correct Answer: C — const

const prevents modification of a variable.

Correct Answer: B — int

By default, main() returns an integer value.

Correct Answer: C — stdio.h

printf() is declared in stdio.h.

Correct Answer: B — ;

Every C statement ends with a semicolon.

Correct Answer: B — _num

Variable names can start with underscore.

Correct Answer: B — const

const keyword declares read-only variables.

Correct Answer: B — scanf()

scanf() is used for formatted input.

Correct Answer: C — long double

long double provides highest floating-point precision.

Correct Answer: A — 5

x is initialized to 5 and printed.

Correct Answer: C — array

Array is a derived data type.

Correct Answer: B — volatile

volatile prevents compiler optimizations.

Correct Answer: B — &

& operator returns the address of a variable.

Correct Answer: B — Platform dependent

C programs depend on underlying hardware and OS.

Correct Answer: B — printf("%d", x);

printf with %d format specifier is used to print integers.

Correct Answer: A — 1 byte

char always occupies 1 byte in C.

Correct Answer: A — unsigned int x;

Correct syntax is modifier followed by data type.

Correct Answer: C — register

register suggests the compiler to store variable in CPU register.

Correct Answer: B — 4

sizeof(int) is typically 4 bytes on modern systems.

Correct Answer: D — All of the above

Integer, floating, and character constants are valid.

Correct Answer: B — \n

\n moves the cursor to next line.

Correct Answer: D — Hello then World in next line

\n causes a line break.

Correct Answer: C — No header required

sizeof is a compile-time operator.

Correct Answer: D — Special symbols

Special symbols like @, # are not allowed.

Correct Answer: A — extern

extern is used to declare global variables across files.

Correct Answer: B — Garbage value

Uninitialized local variables contain garbage values.

Correct Answer: B — float

float stores decimal (fractional) values.

Correct Answer: B — Prevents optimization

volatile tells compiler value may change unexpectedly.

Correct Answer: A — sizeof

sizeof operator returns memory size in bytes.

Correct Answer: B — %lf

double uses %lf in scanf and printf.

Correct Answer: D — Both A and B

C supports both single-line and multi-line comments.

Correct Answer: B — A

ASCII value 65 represents character 'A'.

Correct Answer: C — void

void indicates no return value.

Correct Answer: C — return 0;

return 0 indicates successful execution.