c language,general expression

Question

if we execute this expression in turbo c,using c language a=7   b=(++a)*(++a)   the output will come is 81,that is wrong it must be 72,why ?????????

Vishal Chaturvedi · Answer

thank you sir

Vishal Chaturvedi · Answer

thank you sir

Vulpes · Answer

I haven't used Turbo C for many years but the result of this expression is just the same in the Visual C compiler.
Basically, the operands are determined  before the result of the multiplication operator is calculated. Consequently, 'a' gets incremented twice on both sides of the * operator.

Ranjit Powar · Answer

Hey 81 is right the expression executed as follows.
1. As a=7, it solve first bracket and increment the value of a to 8.
2. In second step the second bracket is solved and again it increment value of a to 9.
3. Then multiplication operation takes place as 9*9=81.
4. And then 9 is assigned to b.