Introduction - If you have any usage issues, please Google them yourself
Functions: (1) first enter the first set of operands, and store it in a file. (2) and then enter the number of operations of the group of second, and it is stored in the second files. (3) choose a add, subtract, multiply and divide operations. (4) take the first operand the first file, the second documents the second operand, the third step in accordance with the add, subtract, multiply and divide operations into third files. (5) read the results the third files. Other requirements: (1) processing type double or float data. (2) to deal with the abnormal results of the program running results