Calculator having integrating function

A calculator having an integrating function comprising:

• key input means having registering keys for setting at least a function to be integrated and the interval of integration, and an executing key for executing definite integration of the function to be integrated which is input by said registering keys over a definite integration interval which is input by said registering keys;
• first memory means coupled to said key input means for storing the function to be integrated which is input by the key operation of said registering keys of said key input means;
• second memory means coupled to said key input means for storing a dividing number for dividing said interval of integration;
• dividing means coupled to said second memory means for dividing the interval of integration determined by the key operation of said registering keys of said key input means by the dividing number stored in said second memory means;
• readout means coupled to said first memory means for sequentially reading out the function to be integrated from said first memory means;
• and
• operating means coupled to said first memory means for sequentially performing the integrating function based on the function to be integrated read out by said readout means, every interval of integration divided by said dividing means, and the data for setting the interval of integration input by the key operation of said registering keys of said key input means.