Doubt in MCQ questions

#1

Pointers MCQ questions 4, 6 explanation please

#2

in question 4 ans will be B Memory Leak

int *ptr = (int *)malloc(sizeof(int)); ptr = NULL;
free(ptr);

there will be memory leak
because after memory allocation pointer points to NULL
and then we loose the access to that allocated memory
memory is allocated means occupied but we can’t access that so this is memory leak

this is not Dangling pointer
ans also Error will not come because every thing is correct

#3

Q­6 What will be the output of the following program? #include using namespace std;

int main() {
int arr[]={0,1,2,3,4};

int i, ptr;
for(ptr= arr, i=0; ptr+i <= arr+4; ptr++, i++) cout<< (ptr+i); return 0;

}
A) 01234 B) 024 C) 234 D) 12340

initially ptr points two first element 0 and i is 0
so firstly we print 0
and then both incremented hence ptr points to 1 and i is also 1
so ptr+i refer to 2 hence 2 will be printed
then again both incremented ptr points to 2 and is also 2
so ptr +i refer to 4

hence final output is 0 2 4