3.5、modf() 傳回x的小數部分，其符号與x相同 ，但是參數中可以添加整數部分的變量( The fractional part of x, with the same sign)
3.6、exp2() 傳回2的x次方，2 raised to the power of x.
3.7、log2() x的二進制對數( The binary logarithm of x)
4、幂函數 Power functions
4.1、pow(base, power) 幂函數 The result of raising base to the power exponent
4.2、sqrt(x) 計算x的平方根
4.3、cbrt(x) 計算x的立方根
4.4、hypot(x,y) 計算直角三角形的斜邊 ( The square root of (x^2+y^2) )
5、誤差與伽馬函數 Error and gamma functions
5.1、誤差函數erf(x)
5.2、餘差函數erfc(x) erfc(x) = 1-erf(x) 誤差函數的補函數
5.3、tgamma(x) 伽馬函數 ( the gamma function )
5.4、lgamma(x) log伽馬函數 ( log-gamma function )
6、四舍五入與餘數函數Rounding and remainder functions
6.1、ceil(x) x上取整函數
6.2、floor(x) x的下取整函數
6.3、fmod(y, x) y/x的餘數
6.4、round(x) x的四舍五入值
7、絕對值、最小、最大 Absolute、Minimum, maximum
7.1、fabs(x) x的絕對值函數
7.2、abs(x) x的絕對值
7.3、fmax(x, y) 兩個參數中的最大值 (The maximum numeric value of its arguments. Values among which the function selects a maximum )
7.4、fmin(x, y) 兩個參數中的最小值
1、三角函數 Trigonometric functions
1.1、 cos() 函數
/* cos example */
#include <stdio.h> /* printf */
#include <math.h> /* cos */
#define PI 3.14159265
int main ()
{
double param, result;
param = 60.0;
result = cos ( param * PI / 180.0 );
printf ("The cosine of %f degrees is %f.\n", param, result );
return 0;
}
1.2 sin() 正弦函數
/* sin example */
#include <stdio.h> /* printf */
#include <math.h> /* sin */
#define PI 3.14159265
int main ()
{
double param, result;
param = 30.0;
result = sin (param*PI/180);
printf ("The sine of %f degrees is %f.\n", param, result );
return 0;
}
1.3、 tan() 正切函數
/* tan example */
#include <stdio.h> /* printf */
#include <math.h> /* tan */
#define PI 3.14159265
int main ()
{
double param, result;
param = 45.0;
result = tan ( param * PI / 180.0 );
printf ("The tangent of %f degrees is %f.\n", param, result );
return 0;
}
1.4、 acos() 反餘弦函數
/* acos example */
#include <stdio.h> /* printf */
#include <math.h> /* acos */
#define PI 3.14159265
int main ()
{
double param, result;
param = 0.5;
result = acos (param) * 180.0 / PI;
printf ("The arc cosine of %f is %f degrees.\n", param, result);
return 0;
}
1.5、asin() 反正弦函數
/* asin example */
#include <stdio.h> /* printf */
#include <math.h> /* asin */
#define PI 3.14159265
int main ()
{
double param, result;
param = 0.5;
result = asin (param) * 180.0 / PI;
printf ("The arc sine of %f is %f degrees\n", param, result);
return 0;
}
1.6、atan() 反正切函數
/* atan example */
#include <stdio.h> /* printf */
#include <math.h> /* atan */
#define PI 3.14159265
int main ()
{
double param, result;
param = 1.0;
result = atan (param) * 180 / PI;
printf ("The arc tangent of %f is %f degrees\n", param, result );
return 0;
}
1.7、atan2() 帶兩個參數的反正切函數
/* atan2 example */
#include <stdio.h> /* printf */
#include <math.h> /* atan2 */
#define PI 3.14159265
int main ()
{
double x, y, result;
x = -10.0;
y = 10.0;
result = atan2 (y,x) * 180 / PI;
printf ("The arc tangent for (x=%f, y=%f) is %f degrees\n", x, y, result );
return 0;
}
2、雙曲函數 Hyperbolic functions
2.1、雙曲餘弦函數
/* cosh example */
#include <stdio.h> /* printf */
#include <math.h> /* cosh, log */
int main ()
{
double param, result;
param = log(2.0);
result = cosh (param);
printf ("The hyperbolic cosine of %f is %f.\n", param, result );
return 0;
}
2.2、雙曲正弦函數
/* sinh example */
#include <stdio.h> /* printf */
#include <math.h> /* sinh, log */
int main ()
{
double param, result;
param = log(2.0);
result = sinh (param);
printf ("The hyperbolic sine of %f is %f.\n", param, result );
return 0;
}
2.3、雙曲正切函數
/* tanh example */
#include <stdio.h> /* printf */
#include <math.h> /* tanh, log */
int main ()
{
double param, result;
param = log(2.0);
result = tanh (param);
printf ("The hyperbolic tangent of %f is %f.\n", param, result);
return 0;
}
3、指數函數與對數函數 Exponential and logarithmic functions
3.1、exp () 指數函數，以 e 為底數
/* exp example */
#include <stdio.h> /* printf */
#include <math.h> /* exp */
int main ()
{
double param, result;
param = 5.0;
result = exp (param);
printf ("The exponential value of %f is %f.\n", param, result );
return 0;
}
3.2、frexp(param，n) 二進制浮點數表示方法 x=param*2^n
/* frexp example */
#include <stdio.h> /* printf */
#include <math.h> /* frexp */
int main ()
{
double param, result;
int n;
param = 8.0;
result = frexp (param , &n);
printf ("%f = %f * 2^%d\n", param, result, n);
return 0;
}
3.3、log(x) x的自然對數 (Natural logarithm of x)
/* log example */
#include <stdio.h> /* printf */
#include <math.h> /* log */
int main ()
{
double param, result;
param = 5.5;
result = log (param);
printf ("log(%f) = %f\n", param, result );
return 0;
}
3.4、log10() 常用對數，以10為底 ( Common logarithm of x )
/* log10 example */
#include <stdio.h> /* printf */
#include <math.h> /* log10 */
int main ()
{
double param, result;
param = 1000.0;
result = log10 (param);
printf ("log10(%f) = %f\n", param, result );
return 0;
}
3.5、modf() 傳回x的小數部分，其符号與x相同 ，但是參數中可以添加整數部分的變量( The fractional part of x, with the same sign)
/* fabs example */
#include <stdio.h> /* printf */
#include <math.h> /* fabs */
int main ()
{
printf ("The absolute value of 3.1416 is %f\n", fabs (3.1416) );
printf ("The absolute value of -10.6 is %f\n", fabs (-10.6) );
return 0;
}
