B00007 快速模幂运算的两个C语言程序 代码来自维基百科的Modular arithmetic。 这两段代码都不是大整数计算的程序,是2进制64整数的计算程序,数据不能大于2进制63位。两段代码分别如下: uint64_t mul_mod(uint64_t a, uint64_t b, uint64_t m) { uint64_t d = 0, mp2 = m >> 1; int i; if ...
uint64_t mul_mod(uint64_t a, uint64_t b, uint64_t m) { uint64_t d = 0, mp2 = m >> 1; int i; if (a >= m) a %= m; if (b >= m) b %= m; for (i = 0; i < 64; ++i) { d = (d > mp2) ? (d << 1) - m : d << 1; if (a & 0x800000000000000...