The difference between m = ++ i and m = i ++

azrael51

I just learned C, I am self-taught, many places are unclear
I encountered such a code while reading a book today, please help me explain

main ()
{
 int i, j, m, n;

 i = 8;

 j = 10;

 m = ++ i;

 n = j ++;

 printf ("% d,% d,% d,% d", i, j, m, n);
}
The output is 9, 11, 9, 10
I would like to ask everyone what is the difference between m = ＋＋ i and m = i ＋＋

read001

m = ++ i <=> i ++; m = i
m = i ++ <=> m = i; i ++
The order is different!

azrael51

Thank you you reminded me I understand