Some Questions about the left value of C/C ++

Source: Internet
Author: User

In standard C ++, ++ I can be used as the left value, and I ++ cannot be used as the left value.

1. ++ I is equivalent to adding 1 to I itself, and then returns the reference of I. I is a common variable, and all can be used as the left value.

 ++ I Implementation

I = I + 1;

Return I;

2. I ++ is equivalent to assigning I to the Temporary Variable generated by the compiler, And then I increases by 1 to return the temporary variable. Because temporary variables cannot be left values, I ++ cannot be left.

I ++ implementation

Int temp;

Temp = I;

I = I + 1;

Return temp;

In addition, in GCC, neither I ++ nor ++ I can be used as the left value..

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