Govt. Exams
Entrance Exams
int arr[] = {10, 20, 30};
int *ptr = arr;
printf("%d", *(ptr + 1));
ptr points to arr[0]. ptr + 1 points to arr[1]. *(ptr + 1) dereferences to get the value at arr[1] which is 20. Pointer arithmetic adds sizeof(int) to the address for each increment.
strcpy() does not perform bounds checking. If the source string is longer than the destination buffer, it will write beyond the buffer boundary, causing a buffer overflow. This is a security vulnerability. Using strncpy() is safer.
int x = 5;
int *ptr = &x;
printf("%d %d", *ptr, x);
*ptr dereferences the pointer to access the value at the address it points to, which is x = 5. So both *ptr and x print 5.
Both A and B are correct. Option A uses explicit type casting which is optional in C (not in C++). Option B avoids casting. Using sizeof(int) is preferred over hardcoding 4, as int size may vary across systems.
scanf() reads formatted input based on format specifiers and stops at whitespace. gets() reads a string until a newline is encountered. Note: gets() is deprecated due to buffer overflow vulnerabilities.
int x = 5;
int y = ++x + x++;
printf("%d", y);
This code exhibits undefined behavior because x is modified twice between sequence points without an intervening sequence point. The result depends on the compiler's implementation.
