1、?三角函數(shù)?

double sin (double);正弦?

double cos (double);余弦?

double tan (double);正切?

2 、反三角函數(shù)?

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

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

double atan (double); 反正切(主值), 結(jié)果介于[-PI/2, PI/2]?

double atan2 (double, double); 反正切(整圓值), 結(jié)果介于[-PI, PI]?

3 、雙曲三角函數(shù)?

double sinh (double);?

double cosh (double);?

double tanh (double);?

4 、指數(shù)與對(duì)數(shù)?

double exp (double);求取自然數(shù)e的冪?

double sqrt (double);開(kāi)平方?

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

double log10 (double);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); 功能與pow一致，只是輸入與輸出皆為浮點(diǎn)數(shù)?

5 、取整?

double ceil (double); 取上整?

用法：向上取整ceil(3.123333)=4 ceilf(3.123333)=4

double floor (double); 取下整?

?用法： ?向下取整 floor(3.123333)=3

6 、絕對(duì)值?

double fabs (double);求絕對(duì)值?

double cabs(struct complex znum) ;求復(fù)數(shù)的絕對(duì)值?

7 、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?

8 、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?

用法：兩數(shù)整除之后的余數(shù)fmod(9, 8)=1.00

double fmod (double, double); 返回兩參數(shù)相除的余數(shù)?

用法：double x, fractpart, intpart;

? ? ? ? x = 8.123456;

? ? ? ? fractpart = modf(x, &intpart);

整數(shù)部分 = 8.000000

?小數(shù)部分 = 0.123456

9 、其他?

double hypot(double x, double y);已知直角三角形兩個(gè)直角邊長(zhǎng)度，求斜邊長(zhǎng)度?

double ldexp(double x, int exponent);計(jì)算x*(2的exponent次冪)?

double poly(double x, int degree, double coeffs [] );計(jì)算多項(xiàng)式?

nt matherr(struct exception *e);數(shù)學(xué)錯(cuò)誤計(jì)算處理程序

原作者鏈接：http://www.itdecent.cn/p/6badf54b7c06