An electronic computer for the solution of a problem when keys of a key button into the result to be pressed, such as numbers, operators and other mathematical notations from left to right in the dissolving problem to appear

摘要

An electronic calculator having a pair of parenthesis keys is capable of displaying a temporary partial result obtained from an operation performed on a portion of a numerical expression to be calculated, which portion is included within a pair of parentheses. The partial result may be continuously displayed until the next key operation is executed. A temporary result from an exponent term in an expression is also indicated visually.