Description: Realize functions: 1) have integer, floating point arithmetic type of data (add, subtract, multiply, divide) operator function. Enter the first operation followed by the number of operators (+,-,*,/), the second operand, and then output. The results can be used as the first operation under a number of operations. Press ' C' clear screen, press the ' X' out. For example: Input: 2+ 5 Output: 72) calculation of single-operator expression functions. Input operands can contain integer or floating point. If you encounter an error of expression, should output error messages. Enter the expression as follows: For example: Input: 2+5 Output: 7
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