Is the first operation supposed to be faster and if so then Why?
c++
Solution
It depends on the capabilities of the underlying CPU, and of the compiler.
Any decent compiler should optimise `u*10` into the appropriate bit-shift operations if it believes they would be faster. It may not be able to do the opposite. So always write `u*10` if you mean `u*10`, unless you know you're working with a bad compiler.
Problem
Is the first opeartion faster than the second one ? ``` u+= (u << 3) + (u << 1) //first operation u+= u*10 //second operation ``` Basically both of them does the same thing that is `u= u+(10*u)` But i came to knew that first operation is faster than second . Does the cpu time when operation + different from * . `Is multiplication by 10 actually equivalent to 10 addition operations being performed ?`