what is difference between ++i and i+=1 from any point of view

Question

This is a question from kn king\'s c programming : a modern approach. I can\'t understand the solution given by him:-

The expression ++i is equivalent to (i          


        

Answer 1

i = 10
printf("%d", i++);

will print 10, where as

printf("%d", ++i);

will print 11

X = i++ can be thought as this

X = i
i = i + 1

where as X = ++i is

i = i + 1
X = i

so,

printf ("%d", ++i); 

is same as

printf ("%d", i += 1);

but not

printf ("%d", i++);

although value of i after any of these three statements will be the same.