Dealing with related mathematical functions in c++

Math library function declaration in math.h, the main are:

1. Abs (x) to find the absolute value of the integer x

2, cosine of x, cosine of x radians

3. Fabs (x) to find the absolute value of floating point number x

4. Ceil of x is the smallest integer not less than x

5. Floor (x) shall find the smallest integer not greater than x

6, log of x, take the natural log of x

7. Log base 10 of x

8, pow of x, y, x to the y

Function description:

Pow () is used to calculate the value of base x to the y, or xy, and return the result.

The return value:

Return x to the y.

9, sine of x, sine of x radians

Function description:

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

The return value:

Returns a calculation between -1 and 1.
10, SQRT of x, square root of x

11, acos of x, find the arc cosine

Function description:

Acos () is used to calculate the arccosine of the parameter x, and then returns the result. Parameter x ranges from -1 to 1, beyond which it fails.

The return value:

Returns the calculation between 0 and PI in radians, and the degrees in the library are expressed in radians.

12. Asin (s) for arcsine

Function description:

Asin () is used to calculate the arcsine of the parameter x and return the result. Parameter x ranges from -1 to 1, beyond which it fails.

The return value:

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

13. Atan (x)

Function description:

Atan () is used to calculate the inverse tangent of the parameter x and return the result.

The return value:

Returns a calculation between -pi /2 and PI/2.

14. Atan2 (x)

Function description:

Atan2 () is used to calculate the inverse tangent of the parameter y/x and return the result.

The return value:

Returns a calculation between -pi /2 and PI/2.

15. Exp (calculate the index)

Function description:

Exp () is used to calculate e to the x, or ex, and return the result.

The return value:

Return e to the x.

16. Frexp (divide floating point Numbers into bases and exponents)

Function description:

Frexp () is used to cut the floating point number of parameter x into bases and exponents. The base part is returned directly, and the exponent part is returned by the exp pointer, which multiplies the value of x by 2 to the exp.

The return value:

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

# include < Stdio. H> # include < Math. H>

main() 
{ 
int exp; 
double fraction,i; 
fraction = frexp (1024,&exp); 
i=ldexp(fraction,exp); 
printf("exp = %dn",exp); 
printf("fraction = %fn", fraction); 
printf("i=%f",i); 
} 

17. Ldexp (calculate 2 to the power)

Function description:

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

The return value:

Returns the calculated result.

# include < Stdio. H>

# include< Math. H>

main() 
{ 
int exp; 
double x,answer; 
answer = ldexp(3,2); 
printf("3*2^(2) = %fn",answer); 
} 

18. Log (to calculate the logarithm base e)

Function description:

Log () is used to calculate the x-base e, and return the result.

The return value:

Returns the natural logarithm of the parameter x.

# include < Stdio. H> # include < Math. H>

main() 
{ 
double answer; 
answer = log (100); 
printf("log(100) = %fn",answer); 
} 

19. Log10 (to calculate the logarithm base 10)

20. Sinh (take the value of the normal xuan function of the hyperbola)

Function description:

Sinh () is used to calculate the positive value of the hyperbola for the parameter x, and then returns the result. The mathematical definition is :(e to the p(x)-e to the p(-x))/2.

The return value:

Returns the positive value of the hyperbola for the parameter x.

# include < Stdio. H> # include < Math. H>

main() 
{ 
double answer = sinh (0.5); 
printf("sinh(0.5) = %fn",answer); 
}