用VC++实现多项式相加。依次输入多项式每一项的系数与指数，以系数0为结束标志，可以实现两个多项式的相加。-Using VC++ to achieve the sum of polynomials. Each one in turn enter the polynomial coefficients and the index to coefficient of 0 as the end of the signs, can achieve the sum of two polynomials.