c++， 计算正弦的近似值。sin(x)=x-x^3/3!+x^5/5!-x^7/7!+…… 要求用while、do-while和for循环语句

Private Sub Command2_Click() Dim x, an, sinx, n x = Val(InputBox("x=")) an = x n = 1 jc = 1 sinx = 0 Do Until Abs(an) < 10 ^ -6 sinx = sinx + an n = n + 1 jc = jc * (2 * n - 2) * (2 * n - 1) an = (-1) ^ (n - 1) * x ^ (2 * n - 1) &