<math.h>是C語(yǔ)言中的數(shù)學(xué)函數(shù)庫(kù)三角函數(shù)

double sin(double x);正弦

double cos(double x);余弦

double tan(double x);正切

*cot三角函數(shù)，可以使用tan(PI/2-x)來(lái)實(shí)現(xiàn)。

反三角函數(shù)

double asin(double x);結(jié)果介于[-PI/2, PI/2]

double acos(double x);結(jié)果介于[0, PI]

double atan(double x);

反正切(主值),結(jié)果介于[-PI/2, PI/2]

double atan2(double y,double);

反正切(整圓值),結(jié)果介于[-PI, PI]

雙曲三角函數(shù)

double sinh(double x);計(jì)算雙曲正弦

double cosh(double x);計(jì)算雙曲余弦

double tanh(double x);計(jì)算雙曲正切

指數(shù)與對(duì)數(shù)

double exp(double x);求取自然數(shù)e的冪

double sqrt(double x);開(kāi)平方

double log(double x);以e為底的對(duì)數(shù)

double log10(double x);以10為底的對(duì)數(shù)

double pow(double x,double y);

計(jì)算以x為底數(shù)的y次冪

float powf(float x,float y);

與pow一致，輸入與輸出皆為浮點(diǎn)數(shù)

取整

double ceil(double);取上整

double floor(double);取下整

標(biāo)準(zhǔn)化浮點(diǎn)數(shù)

double frexp(double f,int *p);

標(biāo)準(zhǔn)化浮點(diǎn)數(shù), f = x *2^p,已知f求x, p ( x介于[0.5,1] )

double ldexp(double x,int p);

與frexp相反,已知x, p求f

取整與取余

double modf(double,double*);

將參數(shù)的整數(shù)部分通過(guò)指針回傳,返回小數(shù)部分

double fmod(double,double);

返回兩參數(shù)相除的余數(shù)