math库函数(国外英语资料).doc

math库函数(国外英语资料) Common functions in math.h Library in C language Int ABS (int i) returns the absolute value of the integer parameter I Double cabs (struct, complex, znum) returns the absolute value of the complex znum Double Fabs (double x) returns the absolute value of the double precision parameter x Long labs (long n) returns the absolute value of the long integer parameter n Double exp (double, x) returns the value of the exponential function e^x Double frexp (double, value, int, *eptr) returns the value of X in value=x*2^n (0.5=x1), and N is stored in eptr Double ldexp (double, value, int, exp); returns the value of value*2^exp Double log (double X) returns the value of logeX, with the logarithm based on e Double log10 (double x) returns the value of log10x, with the logarithm of 10 as the base Double pow (double, x, double, y) returns the value of x^y Double pow10 (int p) returns the value of 10^p Double sqrt (double x) returns a, and a satisfies a*a=x, a=0 Double ACOS (double x) returns the inverse cosine cos^-1 (x) value of X, and X is radians Double asin (double x) returns the inverse sine sin^-1 (x) value of X, and X is radians Double atan (double, x) returns the tangent tan^-1 (x) value of X, and X is radians The double atan2 (double, y, double, x) returns the tangent tan^-1 (x) value of the y/x, and the y of X is radians Double cos (double x) returns the cosine cos (x) value of the X, and the X is radians Double sin (double x) returns the sine sin (x) value of X, and X is radians The double Tan (double, x) returns the tangent Tan (x) of the X, and the X is radians Double cosh (double, x) returns the hyperbolic cosine cosh (x) value of X, and X is radians Double Sinh (double, x) returns the hyperbolic sine Sinh (x) value of X, and X is radians Double tanh (double, x) returns the hyperbolic tangent tanh (x) value of X, and X is radians Double hypot (double, x, double, y) returns the length of the right angled triangle (z), and X and y are the length of th