In C, which of the following correctly declares a pointer to an integer?
Answer: A
The correct syntax is 'int *ptr;' where * indicates ptr is a pointer to int.
Q.22Easy
What will be the output of: printf("%d", 25);
Answer: B
Integer division truncates the result. 25 = 2 (not 2.5) because both operands are integers.
Q.23Easy
What will be the output of: int x = 10; printf("%d", x++);
Answer: A
x++ is post-increment. The current value (10) is printed first, then x is incremented to 11. So output is 10.
Q.24Easy
How many bytes does a 'long long' integer occupy in C (standard 32-bit system)?
Answer: C
'long long' is guaranteed to be at least 64 bits (8 bytes) as per C99 standard.
Q.25Easy
Which escape sequence represents a horizontal tab in C?
Answer: B
\t is the escape sequence for horizontal tab. \n is newline, \h and \s are not valid escape sequences.
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Q.26Easy
What is the correct way to declare a two-dimensional array of integers with 3 rows and 4 columns?
Answer: A
2D array syntax is int arr[rows][columns]. So int arr[3][4] creates 3 rows and 4 columns.
Q.27Easy
What is the output of the following C program?
#include<stdio.h>
int main() {
char str[] = "GATE";
printf("%d", sizeof(str));
return 0;
}
Answer: B
sizeof(str) includes the null terminator. The string "GATE" has 4 characters plus 1 null terminator = 5 bytes.
Q.28Easy
Which of the following is NOT a fundamental data type in C?
Answer: C
C has 5 fundamental data types: int, float, double, char, and void. 'string' is not a fundamental type; it's created using char arrays.
Q.29Easy
What is the size of an 'int' variable in a 32-bit system?
Answer: B
In a 32-bit system, an int is typically 4 bytes (32 bits). However, the C standard only guarantees it's at least 2 bytes, so technically it's compiler-dependent. But in practice, 4 bytes is standard.
Q.30Easy
Which variable declaration is correct in C?
Answer: C
Variable names must start with a letter or underscore, followed by letters, digits, or underscores. Option C follows this rule correctly.
Q.31Easy
Which keyword is used to declare a variable that cannot be modified?
Answer: B
'const' keyword makes a variable constant and immutable after initialization.
Q.32Easy
Which of the following is a derived data type in C?
Answer: B
Derived data types are created from fundamental types. Arrays, pointers, structures, and unions are derived types.
Q.33Easy
How many bits are used to store a 'short int' in a standard C environment?
Answer: B
Standard C guarantees short int is at least 16 bits (2 bytes). Most systems use exactly 16 bits.
Q.34Easy
What is the range of values for a signed char in C?
Answer: B
A signed char occupies 1 byte (8 bits). With sign bit, it ranges from -128 to 127 (2^7 to 2^7-1).
Q.35Easy
Which keyword is used to modify a variable so that it cannot be changed?
Answer: B
The const keyword makes a variable read-only after initialization. Its value cannot be modified during program execution.
Q.36Easy
What is the size of the double data type in most 64-bit systems?
Answer: B
In standard C on 64-bit systems, double occupies 8 bytes and can store values with approximately 15-17 significant digits.
Q.37Easy
Which of the following variable names is INVALID in C?
Answer: C
Variable names cannot start with a digit in C. Valid names must begin with a letter (a-z, A-Z) or underscore (_).
Q.38Easy
What will be the result of sizeof(int) on a typical 32-bit system?
Answer: B
On 32-bit systems, int is typically 4 bytes (32 bits). However, the exact size is implementation-defined per C standard.
Q.39Easy
What is the default data type of a floating-point constant in C?
Answer: B
In C, floating-point constants like 3.14 are treated as double by default. To specify float, you need to use 3.14f suffix.
Q.40Easy
What is the range of unsigned char in C?
Answer: B
unsigned char is 1 byte (8 bits) without sign bit, giving range 0 to 2^8-1 = 0 to 255.
