C Programming Questions & Answers

Q.961 Easy Basics & Syntax

What is the size of 'char' data type in C?

A 2 bytes

B 4 bytes

C 1 byte

D 8 bytes

Correct Answer: C. 1 byte

EXPLANATION

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

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Q.962 Easy Basics & Syntax

Which of the following is the correct syntax to declare a pointer to an integer in C?

A int *ptr;

B int& ptr;

C *int ptr;

D ptr *int;

Correct Answer: A. int *ptr;

EXPLANATION

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

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Q.963 Medium Basics & Syntax

In C, what is the purpose of the 'static' keyword when used with a global variable?

A To make it accessible only within the current file

B To allocate it on the stack

C To make it a constant

D To prevent memory deallocation

Correct Answer: A. To make it accessible only within the current file

EXPLANATION

When 'static' is used with a global variable, it restricts its scope to the current file (internal linkage), making it not accessible from other files.

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Q.964 Hard Basics & Syntax

What will be the output of the following code?
#include
int main() {
int x = 5;
int y = ++x * ++x;
printf("%d", y);
return 0;
}

A 42

B 49

C Undefined behavior

D Runtime Error

Correct Answer: C. Undefined behavior

EXPLANATION

The expression ++x * ++x modifies x twice without an intervening sequence point, causing undefined behavior.

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Q.965 Easy Basics & Syntax

What is the output of the following code?
#include
int main() {
char c = 'A';
printf("%d", c);
return 0;
}

A 65

B A

C 1

D Error

Correct Answer: A. 65

EXPLANATION

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

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Q.966 Medium Basics & Syntax

Which memory segment stores global variables in C?

A Stack

B Heap

C Data segment

D Code segment

Correct Answer: C. Data segment

EXPLANATION

Global variables are stored in the data segment (also called BSS segment for uninitialized globals). Local variables use the stack.

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Q.967 Hard Basics & Syntax

Which of the following correctly declares a function pointer?

A int *func;

B int (*func)();

C int func*();

D int *func();

Correct Answer: B. int (*func)();

EXPLANATION

Function pointers require parentheses around the pointer name: int (*func)(). Option D declares a function returning int pointer, not a function pointer.

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Q.968 Hard Basics & Syntax

What is the main difference between #define and const in C?

A #define is preprocessed while const is handled by compiler

B const occupies memory while #define does not

C Both A and B

D There is no difference

Correct Answer: C. Both A and B

EXPLANATION

#define is a preprocessor directive replaced before compilation, while const creates an actual variable. const occupies memory; #define does not.

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Q.969 Easy Basics & Syntax

What will be printed by the following code?
#include
int main() {
char str[] = "Hello";
printf("%c", str[1]);
return 0;
}

A H

B e

C l

D o

Correct Answer: B. e

EXPLANATION

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

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Q.970 Medium Basics & Syntax

Which of the following is NOT a valid data type modifier in C?

A unsigned long

B signed double

C long float

D unsigned char

Correct Answer: C. long float

EXPLANATION

The 'long' modifier cannot be used with 'float'. You can only use 'double' or 'long double' for longer floating-point types.

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