Answer Posted / uma sankar pradhan

A virtual destructor is needed when we are deleting a
object of derived class using a base class pointer.
i.e.,
base *b=new derived;
delete(b);
Let's say,we have allocated memory dynamically in derived
class constructor to a pointer data member and we
deallocated it in the destructor to avoid memory leakage
When the object is deleted through base class pointer,
only the base class destructor is invoked.consequently,the
dynamically allocated space remains unreleased.so it leads
to memory leak

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#include #include #include #include void select(char *items, int count); int main(void) { char s[255]; printf("Enter a string:"); gets(s); select(s, strlen(s)); printf("The sorted string is: %s.\n", s); getch(); return 0; } void select(char *items, int count) { register int a, b, c; int exchange; char t; for(a = 0; a < count-1; ++a) { exchange = 0; c = a; t = items[ a ]; for(b = a + 1; b < count; ++b) { if(items[ b ] < t) { c = b; t = items[ b ]; exchange = 1; } } if(exchange) { items[ c ] = items[ a ]; items[ a ] = t; } } } design an algorithm for Selection Sort

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