Question

我正试图用海合会乘以两个签了字的64位长数据

long long int A;//(A0,A1)
long long int B;//(B0,B1)

请你帮我处理以下事情

How to input 64bit number using scanf
How to printf
multiply the two numbers

Answer 1

scanf("%lld", &A);
printf("%lld", A);
A*B

Answer 2

您不能确定 长长的 int 是 64 位。您应该尝试做 :

#include <stdint.h>

int64_t A, B;

Answer 3

尝试一下,我也会检查,

void mulul64(uint64 u, uint64 v, uint64 *whi, uint64 *wlo)
{
uint64 u0, u1, v0, v1, k, t;
uint64 w0, w1, w2;
u1 = u >> 32; u0 = u & 0xFFFFFFFF;
v1 = v >> 32; v0 = v & 0xFFFFFFFF;
t = u0*v0;
w0 = t & 0xFFFFFFFF;
k = t >> 32;
t = u1*v0 + k;
w1 = t & 0xFFFFFFFF;
w2 = t >> 32;
t = u0*v1 + w1;
k = t >> 32;
*wlo = (t << 32) + w0;
*whi = u1*v1 + w2 + k;
return;
}

友情链接