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If RPG did support ++ and --. it would not be in the complex way that C and Java support them. RPG would only support
x ++;
x --;
RPG would not support syntax like the following, which mean to increment y after getting its value and to decrement z before getting its value.
x = y++ + --z;
So the only advantage if RPG implemented this request would the ability to code
x ++;
instead of
x += 1;
Therefore, IBM does not intend to provide a solution to this request at this time, so it is being closed.