C++ : What are dereference pointers a1 = a2 doing in the following code?

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So I have this code and I cannot understand what *a1 = *a2 does. I am a beginner at this, and it\'s very difficult for me to understand it.

int *a1, *a2;
a1 =


                      
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C++ : What are dereference pointers *a1 = *a2 doing in the following code?

C++ : What are dereference pointers a1 = a2 doing in the following code?