在 c 中省略 for 循环的最后一部分

Question

Are these two peaces of code equivalent ?

for(int i=0; i<10; i++){
        //some thing
}

and

for(int i=0; ++i<10; ){
        //some thing
}

if they are the same which one is more standard to use?

Answer 1

I wouldn't write it as for(int i = 0; ++i < 10; ) , and ++i differs from i++ due to the order of operations. ++i increments i then "returns" it, i++ "returns" i then increments it.

Answer 2

No, these are not the same thing. You must be aware of the working of prefix increment and postfix increment.

In the second case, in the first iteration of the for loop, variable 'i' will have value 1, but, in the first case the variable 'i' will have value 0 and so on.

Therefore the second loop will run 9 times only whereas the first loop will run 10 times

Answer 3

No its not the same thing but if you write it this way :

for(int i=0; i<10; ){ //some_thing i++; }

its the same