Difference of variable initialization in C++

2018-07-04 16:06:29

This question already has an answer here:

When should I use the new keyword in C++? 11 answers

"Is there any difference between these 2 ways of storing an integer?"

Yes, there is a significant difference.

 int X = 100;

Initializes a variable X on the stack with the value 100 , while

int *pX = new int(100);

allocates memory for an int on the heap, kept in pointer pX , and initializes the value to 100 .

For the latter you should notice, that it's necessary to deallocate that heap memory, when it's no longer needed:

 delete pX;

第一个是在栈上创建一个变量，而第二个是在堆上创建一个变量并创建一个指向它的指针。

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