_c language for processing related mathematical functions in C + +

The mathematical library function declaration in the MATH.H, mainly includes:

1. ABS (x) to calculate the absolute value of integer number x

2, cos (x) x (radian) cosine

3, Fabs (x) to find the absolute value of the floating-point number X

4, Ceil (x) to find the smallest integer less than x

5, floor (x) to find the smallest integer greater than X

6, log (x) to find the natural logarithm of X

7, LOG10 (x) to find the logarithm of x (bottom 10)

8, pow (x, y) to find X's Y-second side

Function Description:

POW () is used to calculate Y-square values with x as the base, that is, XY values, and then return the results.

return value:

Returns the Y-second-side calculation of X.

9, sin (x) for the sine of X (radians)

Function Description:

Sin () is used to calculate the positive value of the parameter x, and then returns the result.

return value:

Returns the calculated results from 1 through 1.
10, sqrt (x) to find the square root of X

11, ACOs (x) to seek the reverse cosine

Function Description:

ACOs () is used to calculate the inverse cosine of the parameter x, and then returns the result. The parameter x range is between 1 and 1 and will fail if it exceeds this range.

return value:

Returns the calculated result between 0 and pi, in radians, in radians in the function library.

12, ASIN (s) to the anyway string

Function Description:

ASIN () is used to calculate the inverse chord value of the parameter x, and then returns the result. The parameter x range is between 1 and 1 and will fail if it exceeds this range.

return value:

Returns the result of the calculation between the PI/2 of the-PI/2.

13, Atan (x)

Function Description:

Atan () is used to calculate the tangent value of the parameter x, and then returns the result.

return value:

Returns the result of the calculation between-PI/2 and PI/2.

14, atan2 (x)

Function Description:

ATAN2 () is used to calculate the tangent value of the parameter y/x, and then returns the result.

return value:

Returns the result of the calculation between-PI/2 and PI/2.

15, exp (calculation index)

Function Description:

EXP () is used to calculate the X-square value, the ex value, at the base of E, and then return the result.

return value:

Returns the X-square calculation result of E.

16, Frexp (the number of floating-point types into the base and index)

Function Description:

Frexp () is used to cut the floating-point number of parameter x to base and exponent. The base part is returned directly, the exponent part is returned by the parameter exp pointer, and the return value is multiplied by the value of 2 for the exp secondary square.

return value:

Returns the base portion of the parameter x, and the exponent part is at the address indicated by the EXP pointer.

#include <stdio.h>

#include <math.h>

Copy Code code as follows:

Main ()
{
int exp;
Double fraction,i;
fraction = Frexp (1024,&EXP);
I=ldexp (FRACTION,EXP);
printf ("exp =%d\n", exp);
printf ("fraction =%f\n", fraction);
printf ("i=%f", I);
}

17, Ldexp (Calculate 2 of the second square value)

Function Description:

Ldexp () is used to multiply the parameter x by 2 of the exp quadratic value, that is, the x*2exp.

return value:

Returns the result of the calculation.

/* Compute 3* (2^2) =12 * *

#include <stdio.h>

#include <math.h>

Copy Code code as follows:

Main ()
{
int exp;
Double x,answer;
Answer = LDEXP (3,2);
printf ("3*2^ (2) =%f\n", answer);
}

18, log (to calculate the value of an e-base)

Function Description:

Log () is used to calculate an X pair value with an E, and then returns the result.

return value:

Returns the natural pair value of the parameter x.

#include <stdio.h>

#include <math.h>

Copy Code code as follows:

Main ()
{
Double answer;
Answer = log (100);
printf ("log (m) =%f\n", answer);
}

19, log10 (calculated with a value of 10)

20, Sinh (take the double curve positive and black function value)

Function Description:

Sinh () is used to calculate the hyperbolic positive values of the parameter x, and then returns the result. The mathematical definition is: (exp (x)-exp (-X))/2.

return value:

Returns the hyperbolic positive value of the parameter x.

#include <stdio.h>

#include <math.h>

Copy Code code as follows:

Main ()
{
Double answer = sinh (0.5);
printf ("sinh (0.5) =%f\n", answer);
}