78 lines
1.8 KiB
C
78 lines
1.8 KiB
C
#include "../include/math.h"
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static unsigned long long rand_seed = 1 ;
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static unsigned short max_bit = 32 ;
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static unsigned short randlevel = 1 ;
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const unsigned long long rand(){
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unsigned short i = 0;
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while(i < randlevel)
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rand_seed = rand_seed * 1103515245 + 12345 , rand_seed <<= max_bit , i ++ ;
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return (const unsigned long long)(rand_seed >>= max_bit) ;
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}
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void srand(unsigned long long seed){
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rand_seed = seed ;
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}
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void smax(unsigned short max_b){
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max_b = (sizeof(unsigned long long) * 8) - (max_b % (sizeof(unsigned long long) * 8)) ;
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max_bit = (max_b == 0) ? (sizeof(unsigned long long) * 8 / 2) : (max_b) ;
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}
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void srandlevel(unsigned short randlevel_){
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if(randlevel_ != 0)
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randlevel = randlevel_ ;
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}
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int32_t abs(int32_t x){
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return (x < 0) ? (-x) : (x) ;
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}
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double pow(double a,long long b){
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char t = 0 ;
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if(b < 0)b = -b , t = 1 ;
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double ans = 1 ;
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while(b){
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if(b & 1)ans *= a ;
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a *= a ;
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b >>= 1 ;
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}
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if(t)return (1.0 / ans) ;
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else return ans ;
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}
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//快速整数平方
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unsigned long long ull_pow(unsigned long long a,unsigned long long b){
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unsigned long long ans = 1 ;
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while(b){
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if(b & 1)ans *= a ;
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a *= a ;
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b >>= 1 ;
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}
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return ans ;
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}
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double sqrt(double x){
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if(x == 0)return 0.0 ;
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double xk = 1.0,xk1 = 0.0 ;
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while(xk != xk1)xk1 = xk , xk = (xk + x / xk) / 2.0 ;
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return xk ;
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}
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//快速求算数平方根（速度快，精度低）
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float q_sqrt(float number){
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long i ;
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float x,y ;
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const float f = 1.5F ;
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x = number * 0.5F ;
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y = number ;
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i = *(long*)(&y) ;
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i = 0x5f3759df - (i >> 1) ;
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y = *(float*)(&i) ;
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y = y * (f - (x * y * y)) ;
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y = y * (f - (x * y * y)) ;
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return number * y ;
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}
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