说明：  1.在窗口弹出“请先输入第一个多项式的项数，再以指数递降方式输入第一个多项式非零项系数和指数，数字间以空格分隔”后按照要求输入需要进行运算的第一个多项式的项数系数和指数。 2.在窗口弹出“请先输入第二个多项式的项数，再以指数递降方式输入第二个多项式非零项系数和指数，数字间以空格分隔”后按照要求输入需要进行运算的第二个多项式的项数系数和指数。 3.在窗口弹出“请选择您要进行的运算：1）加法 2）减法 3）乘法”输入对应数字选择要进行的运算 4.在计算结果输出后按下任意键退出exe
(1. in the window, "please input the number of the first polynomial first, then input the first polynomial non zero term coefficient and index by exponential descending mode, the number is separated by space", and then input the number coefficient and index of the first polynomial which needs to be operated according to the requirement. 2. in the window, "please input the number of second polynomials first, then input second polynomial non zero coefficients and exponents by exponential descending mode, the number is separated by space", and then input the number coefficient and index of the second polynomials which need to be operated in accordance with the requirement. 3. in the window pop-up "please select the operation you want to do: 1) addition 2" subtraction 3) multiplication "input the corresponding number to select the operation to be performed. 4. press any key to exit exe after the output of the calculation result)