memcpy(dest, src, count) copies 'count' bytes from src to dest. strlen() and sizeof() may not give correct results for all data types.
Q.82Easy
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.83Medium
Consider the following code:
int x = 5;
int *ptr = &x;
int pptr = &ptr;
printf("%d", pptr);
What is the output?
Answer: A
pptr is a pointer to pointer. **pptr dereferences twice: first to get ptr, then to get x's value which is 5.
Q.84Medium
What will be printed by the following code?
#include<stdio.h>
int main() {
int arr[5] = {1, 2, 3, 4, 5};
int *p = arr;
printf("%d %d", *(p+2), arr[2]);
return 0;
}
Answer: A
*(p+2) accesses the element at index 2 (value 3), and arr[2] also accesses index 2 (value 3). Both print 3.
Q.85Medium
What is the output of this code?
#include<stdio.h>
int main() {
int a = 5, b = 10;
a = a ^ b;
b = a ^ b;
a = a ^ b;
printf("%d %d", a, b);
return 0;
}
Answer: B
This is a classic XOR swap algorithm. After three XOR operations, a and b exchange their values. Result: a=10, b=5.
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Q.86Hard
Consider the following declaration:
int (*func_ptr)(int, int, int);
Which of the following function signatures can be correctly assigned to func_ptr?
Answer: A
func_ptr must point to a function that takes exactly 3 int parameters and returns int. Only option A matches this signature exactly.
Q.87Easy
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.88Easy
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.89Easy
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.90Medium
What will be the output of the following code?
int x = 5;
float y = x;
printf("%f", y);
Answer: A
Implicit type conversion occurs from int to float. The value 5 is converted to 5.0 and printed as 5.000000 with %f format specifier.
Q.91Medium
Which of the following occupies maximum memory in a 64-bit system?
Answer: B
In a 64-bit system, long double typically occupies 16 bytes (128 bits), which is the maximum among these options.
Q.92Medium
What is the range of unsigned int in a 32-bit system?
Answer: B
Unsigned int uses all 32 bits for magnitude, giving range 0 to 2^32 - 1 (0 to 4,294,967,295).
Q.93Easy
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.94Medium
What is the difference between 'static' and 'extern' variables?
Answer: B
static restricts variable visibility to the current file; extern declares a variable defined elsewhere with global scope.
Q.95Medium
What is the output of the following code?
int x = 10;
int *p = &x;
printf("%d", *p);
Answer: A
p is a pointer to x. *p dereferences the pointer, giving the value of x, which is 10.
Q.96Easy
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.97Hard
What will be the size of the following structure?
struct test {
char c;
int i;
float f;
};
Answer: D
Size depends on compiler's padding and alignment rules. Typically 12 bytes with padding, but varies by system.
Q.98Medium
Which variable storage class has default initialization to 0?
Answer: C
Static variables are automatically initialized to 0 by the compiler.
Q.99Medium
What is the output of this code?
float x = 25;
printf("%f", x);
Answer: B
25 performs integer division (both operands are int), resulting in 2. This is then converted to float as 2.0.
Q.100Easy
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.
