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Sequence points

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consider this program:

using namespace std;
int main()
int i=0;
i= ++i + 1 + (i++*4);
cout<< i;
return 0;
how value of i will be calculated? what is the relation of
sequence point with this problem?
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so is it also undefined?
i=i++ +1;// it gives answer : i+2

explain more on sequence point. and same rule is with C also?
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