
i want calcultor with interface in java and in interface there is button called postfix ,,, when the user enter opertions and numbers first check if is vaild or not then convert to postfix then result plz help me i have project in it ,,i must make interface like that and every button must run
result
Ac Mr M+ Mc ( ) 7 8 9 + 4 5 6 * 1 2 3 \ 0 . = -
postfix
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