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dijerat
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nilaikan ungkapan aritmetik. nilai setiap arg sebagai ungkapan aritmetik. penilaian dibuat dengan integer lebar-tetap tan memeriksa limpahan, melalui pembahagian 0 dijerat dan dibendera sebagai ralat. senarai kendalian berikut dikumpul kepada aras kendalian sama-duluan. aras disenarai dalam tertib duluan menurun. \tid++, id--\tpos-tokokan, post-susutan pembolehubah \t++id, --id\tpra-tokokan, pra-susutan pembolehubah \t-, +\t\ttolak, tambah unari \t!, ~\t\tnegasi logik dan bitwise \t**\t\tbereksponen \t*, /, %\t\tdarab, bahagi, baki \t+, -\t\ttambah, tolak \t<>\t\tanjak bitwise kiri dan kanan \t=, \tbanding \t==, !=\t\tsama, tidak sama \t\t\tbitwise and \t^\t\tbitwise xor \t_bar_\t\tbitwise or \t&\t\tlogical and \t_bar__bar_\t\tlogical or \texpr ? expr : expr \t\t\tkendalian bersyarat \t=, *=, /=, %=, \t+=, -=, <>=, \t=, ^=, _bar_=\ttugasan pembolehubah shell dibenar sebagai kendalian. nama pembolehubah diganti dengan nilainya (dipaksa ke integer lebar-tetap) di dalam ungkapan. pembolehubah tidak perlu atribut integernya dihidupkan untuk diguna dalam sesebuah ungkapan. pengendali dinilai dalam tertib duluan. sub-ungkapan dalam kurungan dinilai dahulu dan boleh batalkan peraturan duluan diatas. status keluar: jika arg terakhir nilai ke 0, biar kembali 1; jika tidak biar kembali 0.
evaluate arithmetic expressions. evaluate each arg as an arithmetic expression. evaluation is done in fixed-width integers with no check for overflow, though division by 0 is trapped and flagged as an error. the following list of operators is grouped into levels of equal-precedence operators. the levels are listed in order of decreasing precedence. \tid++, id--\tvariable post-increment, post-decrement \t++id, --id\tvariable pre-increment, pre-decrement \t-, +\t\tunary minus, plus \t!, ~\t\tlogical and bitwise negation \t**\t\texponentiation \t*, /, %\t\tmultiplication, division, remainder \t+, -\t\taddition, subtraction \t<>\t\tleft and right bitwise shifts \t=, \tcomparison \t==, !=\t\tequality, inequality \t\t\tbitwise and \t^\t\tbitwise xor \t_bar_\t\tbitwise or \t&\t\tlogical and \t_bar__bar_\t\tlogical or \texpr ? expr : expr \t\t\tconditional operator \t=, *=, /=, %=, \t+=, -=, <>=, \t=, ^=, _bar_=\tassignment shell variables are allowed as operands. the name of the variable is replaced by its value (coerced to a fixed-width integer) within an expression. the variable need not have its integer attribute turned on to be used in an expression. operators are evaluated in order of precedence. sub-expressions in parentheses are evaluated first and may override the precedence rules above. exit status: if the last arg evaluates to 0, let returns 1; let returns 0 otherwise.