大整数乘法例子代码 /* 递归边界，如果是1位二进制数与1位二进制数相乘，则可以直接计算 */ /*累计做1位二进制乘法运算的次数*/ /* return (X*Y) */ /* 计算n的值 */ /* 把X和Y拆分开来，令X=A*2^(n/2)+B, 左移位运算，mod = 1<<(n/2) */ /* 计算XY=AC*2^n+(AD+CB)*2^(n/2)+BD */ /* 计算A*C，再向左移n位 */ /* 递归计算A*D */ /* 递

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