var stackarr = [];  var topp = -1;  function push(e) {    topp++;    stackarr[topp] = e;}  function pop() {    if (topp == -1)        return 0;    else {        var popped_ele = stackarr[topp];        topp–;        return popped_ele;    }}  function operator(op) {    if (op == ‘+’ || op == ‘-‘ ||         op == ‘^’ || op == ‘*’ ||         op == ‘/’ || op == ‘(‘ ||         op == ‘)’) {        return true;    }    else        return false;}  function precedency(pre) {    if (pre == […]

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