基本操作：创建一个复数 creat(a) 输出一个复数 outputc(a) 求两个复数相加之和 add(a,b) 求两个复数相减之差 sub(a,b) 求两个复数相乘之积 chengji(a,b) -Basic steps: the creation of a plural creat (a) the output of a plural outputc (a) for the sum of the two plural and add (a, b) f