String Basics and Memory Representation in DSA C - Interactive Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a string variable in C.

DSA C

char name[] = [1];

Drag options to blanks, or click blank then click option'

A"Hello"

B'Hello'

CHello

D"H"

Attempts:

3 left

💡 Hint

Common Mistakes

Using single quotes for strings

Not using quotes at all

In C, strings are arrays of characters enclosed in double quotes. Single quotes are for single characters.

2fill in blank

medium

Complete the code to print the first character of the string.

DSA C

printf("%c", name[1]);

Drag options to blanks, or click blank then click option'

A(0)

B[1]

C[0]

D.0

Attempts:

3 left

💡 Hint

Common Mistakes

Using parentheses instead of brackets

Starting index at 1

String indexing in C starts at 0, so name[0] gives the first character.

3fill in blank

hard

Fix the error in the code to copy one string to another.

DSA C

strcpy(dest, [1]);

Drag options to blanks, or click blank then click option'

A&source

Bdest

C*source

Dsource

Attempts:

3 left

💡 Hint

Common Mistakes

Passing destination as source

Using & or * operators incorrectly

The source string must be passed as a pointer to strcpy, not the destination or address operators.

4fill in blank

hard

Fill both blanks to declare and initialize a string pointer.

DSA C

char *ptr = [1];

Drag options to blanks, or click blank then click option'

A'World'

B"World"

Cptr

DWorld

Attempts:

3 left

💡 Hint

Common Mistakes

Using single quotes for strings

Not using quotes at all

A string pointer can be initialized to a string literal enclosed in double quotes.

5fill in blank

hard

Fill all three blanks to print the length of a string using strlen.

DSA C

int len = strlen([1]);
printf("Length: %[2]\n", [3]);

Drag options to blanks, or click blank then click option'

Astr

Bd

Clen

Dstrcpy

Attempts:

3 left

💡 Hint

Common Mistakes

Using %c instead of %d for printing length

Passing wrong variable to strlen

strlen takes the string variable, printf uses %c for char, but for int length we use %d. Here %c is incorrect, correct is %d.