C Programming Questions & Answers

Q.481 Medium Basics & Syntax

What is the range of values for 'signed char' in C (assuming 8-bit char)?

A 0 to 255

B -128 to 127

C -256 to 255

D 0 to 127

Correct Answer: B. -128 to 127

EXPLANATION

A signed char is 1 byte (8 bits) and can represent values from -128 to 127 using two's complement representation.

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Q.482 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.483 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.484 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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Q.485 Medium Basics & Syntax

What is the output of the following code?
#include
int main() {
int a = 5, b = 10;
a = b++;
printf("%d %d", a, b);
return 0;
}

A 5 10

B 10 11

C 11 11

D 10 10

Correct Answer: B. 10 11

EXPLANATION

b++ returns the current value of b (10) before incrementing, so a = 10. Then b increments to 11.

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Q.486 Medium Basics & Syntax

Which of the following correctly initializes a 2D array?

A int arr[3][3] = {1, 2, 3, 4, 5, 6, 7, 8, 9};

B int arr[3][3] = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}};

C Both A and B

D Neither A nor B

Correct Answer: C. Both A and B

EXPLANATION

Both syntaxes are valid in C. The first uses row-major order without explicit braces, the second uses explicit nested braces.

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Q.487 Medium Basics & Syntax

What will be the output of the following code?
#include
int main() {
int x = 10, y = 20;
int *p = &x, *q = &y;
*p = *q;
printf("%d %d", x, y);
return 0;
}

A 10 20

B 20 20

C 10 10

D 20 10

Correct Answer: B. 20 20

EXPLANATION

*p = *q assigns the value of y (20) to x through the pointer p. So x becomes 20, y remains 20.

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Q.488 Medium Basics & Syntax

What will be printed by the following code?
#include
int main() {
float f = 0.1 + 0.2;
if(f == 0.3)
printf("Equal");
else
printf("Not Equal");
return 0;
}

A Equal

B Not Equal

C Compiler Error

D Runtime Error

Correct Answer: B. Not Equal

EXPLANATION

Due to floating-point precision limitations, 0.1 + 0.2 does not exactly equal 0.3 in binary representation.

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Q.489 Medium Basics & Syntax

What is the size of the following structure in bytes (assuming 32-bit system)?
struct Point {
char c;
int x;
double d;
}

A 13

B 16

C 17

D 20

Correct Answer: B. 16

EXPLANATION

Due to structure padding and alignment: char (1 byte) + padding (3 bytes) + int (4 bytes) + double (8 bytes) = 16 bytes.

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Q.490 Medium Basics & Syntax

What is the purpose of the void keyword in C?

A To declare empty variables

B To indicate absence of type or empty parameter list

C To declare null pointers

D To terminate a program

Correct Answer: B. To indicate absence of type or empty parameter list

EXPLANATION

void indicates absence of a return type (void function) or an empty parameter list func(void). It can also represent a generic pointer (void *).

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