INCREMENT AND DECREMENT OPERATORS SIMPLIFIED

Answer 1

++i means “increment i IMMEDIATELY,”

while

i++ means “use the old value of use the old value of i for NOW, but
increment i LATER.”

EXAMPLES=>

int a = 21;
int c ;

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c = a++;
cout << c c=21
cout << a a=22

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c = ++a;
cout << c c=23

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Answer 2

well, think of it this way, you get the value of i but you perform the operations in order, so:
x = ++i // increment i; get value of i into x // x and i have the same incremented value
x = i++ // get value of i into x; increment i // x has old i value, i has incremented value