C042Arrays and Strings • Array index
Most ImportantEasy
Q1.The index of the FIRST element of an array in C is:
A
1
B
0
Correct answer
C
-1
D
depends on compiler
Answer Green MarksON
Correct answers are highlighted in green
C043Arrays and Strings • Array declaration
Most ImportantEasy
Q2.How many integers can the array int a[5]; store?
A
4
B
5
Correct answer
C
6
D
1
C044Arrays and Strings • Array index
Most ImportantEasy
Q3.For int a[5]; the valid index range is:
A
0 to 5
B
1 to 5
C
0 to 4
Correct answer
D
1 to 4
C045Arrays and Strings • 2D array
Most ImportantEasy
Q4.How do you declare a 2D integer array with 3 rows and 4 columns?
A
int a[3,4];
B
int a[3][4];
Correct answer
C
int a(3)(4);
D
int a[7];
C046Arrays and Strings • String functions
Most ImportantEasy
Q5.Which function returns the length of a string?
A
strlen()
Correct answer
B
strcpy()
C
strcat()
D
strcmp()
C048Arrays and Strings • Null terminator
Most ImportantMedium
Q6.Every string in C is terminated by which character?
A
\n (newline)
B
\0 (null character)
Correct answer
C
\t (tab)
D
a space
C053Arrays and Strings • Memory layout
Most ImportantMedium
Q7.Array elements in C are stored in:
A
random memory locations
B
contiguous (consecutive) memory locations
Correct answer
C
reverse order
D
linked nodes
C130Arrays and Strings • Array size
Most ImportantEasy
Q8.How many elements does int a[] = {1, 2, 3, 4}; have?
A
3
B
4
Correct answer
C
5
D
0
C135Arrays and Strings • 2D array
Most ImportantEasy
Q9.How many elements can int a[2][3]; store?
A
5
B
6
Correct answer
C
23
D
8
C047Arrays and Strings • String header
ImportantEasy
Q10.Which header file is required for string functions like strlen() and strcpy()?
A
<stdio.h>
B
<string.h>
Correct answer
C
<ctype.h>
D
<math.h>
C049Arrays and Strings • strlen
ImportantMedium
Q11.What value does strlen("HELLO") return?
A
4
B
5
Correct answer
C
6
D
1
C050Arrays and Strings • String storage
ImportantMedium
Q12.What is the minimum array size needed to store the string "HELLO"?
A
5
B
6
Correct answer
C
4
D
10
C051Arrays and Strings • strcat
ImportantEasy
Q13.The function strcat() is used to:
A
copy a string
B
compare two strings
C
join (concatenate) two strings
Correct answer
D
find string length
C052Arrays and Strings • strcmp
ImportantMedium
Q14.strcmp(s1, s2) returns 0 when:
A
s1 is greater than s2
B
s1 is smaller than s2
C
both strings are equal
Correct answer
D
always
C131Arrays and Strings • Pointer equivalence
ImportantHard
Q15.For an array a, the expression a[i] is equivalent to:
A
*(a + i)
Correct answer
B
*(a) + i
C
a + i
D
&a[i]
C132Arrays and Strings • Char array
ImportantMedium
Q16.How many elements does char name[] = "RAM"; contain?
A
3
B
4
Correct answer
C
5
D
2
C133Arrays and Strings • String input
ImportantMedium
Q17.scanf("%s", str) stops reading the string when it reaches:
A
a full stop
B
whitespace (space, tab or newline)
Correct answer
C
a comma
D
the letter z
C134Arrays and Strings • String comparison
ImportantMedium
Q18.Which of the following CANNOT be used to compare two strings in C?
A
strcmp()
B
the == operator
Correct answer
C
a loop comparing characters
D
strncmp()
C138Arrays and Strings • 2D index
ImportantEasy
Q19.The top-left element of int a[5][5]; is accessed as:
A
a[1][1]
B
a[0][0]
Correct answer
C
a[5][5]
D
a[0]
C140Arrays and Strings • strcpy
ImportantEasy
Q20.In strcpy(dest, src); the copying happens:
A
from dest into src
B
from src into dest
Correct answer
C
in both directions
D
not at all
C141Arrays and Strings • Array to function
ImportantHard
Q21.When an array is passed to a function, what is actually passed?
A
a copy of every element
B
the base address of the array
Correct answer
C
only the first element
D
the array size
C136Arrays and Strings • 2D array
OtherHard
Q22.In memory, the elements of a 2D array in C are stored in:
A
column-major order
B
row-major order
Correct answer
C
random order
D
reverse order
C137Arrays and Strings • Line input
OtherMedium
Q23.To read a full line of text including spaces, which function is suitable?
A
scanf("%s")
B
getchar()
C
fgets() / gets()
Correct answer
D
strlen()
C139Arrays and Strings • Array size rule
OtherMedium
Q24.In standard C, the size of an ordinary array must be a:
A
float value
B
constant known at compile time
Correct answer
C
string
D
negative number