NUMERICAL EXPRESSION DISPLAY CONTROL DEVICE, NUMERICAL EXPRESSION DISPLAY CONTROL METHOD, NUMERICAL EXPRESSION DISPLAY CONTROL PROGRAM

摘要

PROBLEM TO BE SOLVED: To provide a numerical expression display control device capable of properly learning a calculation of an inverse number in conjunction with a fraction.SOLUTION: A user inputs a numerical expression and displays the same. While positioning a cursor Cu at an arbitrary position of the numerical expression, when an inverse number key 13i is pressed, a parenthesis group, a function group and a multiplication symbol omitted group are determined so that a numerical expression group to be an object of an inverse number is detected in a predetermined direction (in a forward direction of the numerical expression) from the cursor Cu to immediately before an arithmetical, or the group or the top of the numerical expression. A fraction of an inverse number which has a group of the detected numerical expression as a denominator and "1" as a numerator is displayed in place of the detected group.