User manual CITIZEN CX-185III

[. . . ] When the key operations are performed by these keys according to a numerical expression, a result of operation is obtained according to mathematical priorities. Whenever the key is operated, the calculator discriminates the above priorities and holds the data and operation keys pending as required. This pending action is possible up to 6 times, and 15 levels or more pending become error. [. . . ] When [ ( ] key is first accepted, the special display "( )" illuminates. When a parenthesis expression is completed [ ) ] and [=] key or When it is cleared by the [ON/C] key, etc. Or when errors are generated, the special display "( )" goes out. If it is within the allowable range of pending, [ ( ] can be input into any place in an expression as many times as desired. However, if the key is pressed continuously 16 times or more, it becomes error. From a viewpoint of numerical expression when the corresponding " ) " key is not pressed, the operation is not executed even if the " ( " key is pressed. On the other hand, When the " ( " key is pressed and the " = " key is the pressed without pressing the corresponding " ) " key, the operation is also completed according to the priority. The memory register "M" used by these keys is a completely independent single memory. When exponential portion is not specified: [00 0] : Upon pressing this key immediately after the value is entered, displayed value is shifted to the right and the last digit is erased. When exponential portion is entered: Numberals in exponential ponential portion are shifted right and last digit is erased. [SHIFT] [CPLX] : Setting and clearing of complex number mode are executed alternately. X : Power / Root key [x y ] [xy] : Press any number [x], [xy], any number [y], and [=] to raise y to the x power. [SHIFT] [ Y y x ] : Press any number [x] [SHIFT] [ x ], any number [y], and [=] to display the y root x. Because there is automatic priority of operations Logic the calculations, may be performed as expressed in the equation. (Where the priority of two operations are the same they are performed in the order in which they appear). When execution starts with high priority calculations it is necessary to save low priority calculation, and for that reason there are 6 internal storage levels supplied. [. . . ] When execution starts with high priority calculations it is necessary to save low priority calculation, and for that reason there are 6 internal storage levels supplied. These storage levels are also used in calculations involving parenthesis, therefore as long as priority operations involving parenthesis do not exceed 15 levels the calculations may be performed as they appear in the equation. Input and output the independent memory is done by pressing [XM], [MR], [M+] Example: 123 x 2 456 x 3 789 x 4 +) 1470 Total 6240 Key Input [ON/C] [XM] [1] [2] [3] [x] [2] [M+] [4] [5] [6] [x] [3] [M+] [7] [8] [9] [x] [4] [M+] - E13 M Parenthesis are used when it is desired to perform calculations in a first priority that usually followed for the +, ­, x, ÷ , xy , y x , operations. [. . . ]