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Which of the following is a valid way to allocate dynamic memory for an integer variable?

162 . Which of the following is a valid way to allocate dynamic memory for an integer variable?

1. int *ptr = new int(111);
2. int *ptr = NULL;ptr = new int; *ptr=111;
3. int *ptr;ptr = new int; *ptr=111;
4. All the above

Answer: D) All the above

Explanation:

All the given options are valid to allocate dynamic memory for an integer variable.