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C Programming

C language from basics to advanced placement prep

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Difficulty: All Easy Medium Hard 591–600 of 1,000

Topics in C Programming

All Basics & Syntax 100 Data Types & Variables 100 Control Flow 100 Functions 100 Arrays & Strings 100 Pointers 100 Structures & Unions 100 File Handling 100 Dynamic Memory 100 Preprocessor 100

Q.591 Medium Arrays & Strings

What will be printed by: printf("%s", "Hello\0World");?

A HelloWorld

B Hello

C World

D Hello\0World

Correct Answer: B. Hello

EXPLANATION

\0 is the null terminator which marks the end of a string. %s stops printing at the first null character.

Test

Q.592 Medium Arrays & Strings

What is the output of the following code?
int arr[] = {10, 20, 30};
printf("%d", sizeof(arr)/sizeof(arr[0]));

A 1

B 2

C 3

D 6

Correct Answer: C. 3

EXPLANATION

sizeof(arr) gives total bytes of array. sizeof(arr[0]) gives bytes of one element. Division gives number of elements: 3.

Test

Q.593 Medium Arrays & Strings

Which function is used to reverse a string in C library?

A reverse()

B strrev()

C String reversal is not in standard C library

D revstr()

Correct Answer: C. String reversal is not in standard C library

EXPLANATION

There is no standard library function for string reversal. strrev() is non-standard (available in some compilers). Manual reversal or custom functions are needed.

Test

Q.594 Medium Arrays & Strings

What is the difference between char str[] = "Test" and char *str = "Test"?

A No difference

B First is array, second is pointer; first is modifiable, second is read-only

C First is pointer, second is array

D First causes error, second is valid

Correct Answer: B. First is array, second is pointer; first is modifiable, second is read-only

EXPLANATION

char[] creates a modifiable array with its own storage. char* points to read-only string literal in memory.

Test

Q.595 Medium Arrays & Strings

What will be the output of the following code?
char str[] = "Code";
printf("%c", str[2]);

A C

B o

C d

D e

Correct Answer: C. d

EXPLANATION

String "Code" has indices: C(0), o(1), d(2), e(3). str[2] refers to 'd'.

Test

Q.596 Easy Arrays & Strings

Consider a 2D array declared as: int matrix[3][4]. How many elements does it have?

A 3

B 4

C 7

D 12

Correct Answer: D. 12

EXPLANATION

A 2D array with dimensions 3x4 has 3*4 = 12 total elements.

Test

Q.597 Easy Arrays & Strings

What does the following code do? strcpy(dest, src);

A Compares two strings

B Copies string src to dest

C Concatenates two strings

D Finds length of string

Correct Answer: B. Copies string src to dest

EXPLANATION

strcpy() copies the contents of the source string to the destination string.

Test

Q.598 Easy Arrays & Strings

Which of the following is NOT a valid string initialization?

A char str[] = "Program";

B char str[10] = {'P','r','o','g'};

C char str[10]; str = "Program";

D char *str = "Program";

Correct Answer: C. char str[10]; str = "Program";

EXPLANATION

Array names are constant pointers and cannot be reassigned. Direct assignment to char array after declaration is invalid.

Test

Q.599 Easy Arrays & Strings

What will be the output of strlen("Hello") in C?

A 4

B 5

C 6

D Error

Correct Answer: B. 5

EXPLANATION

strlen() returns the length of the string excluding the null terminator '\0'. "Hello" has 5 characters.

Test

Q.600 Easy Arrays & Strings

What is the correct way to declare a 1D array of 10 integers in C?

A int arr[10];

B int arr(10);

C int arr{10};

D int [10]arr;

Correct Answer: A. int arr[10];

EXPLANATION

In C, arrays are declared with the syntax: datatype arrayname[size]. Option A follows the correct syntax.

Test

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