cppreference.com > Standard C Math acos Syntax:
      #include <math.h>
      double acos( double arg );
The acos() function returns the arc cosine of arg. arg should be between -1 and 1. Related topics: asin atan atan2 cos cosh sin sinh tan tanh

abs
Syntax:

      #include <stdlib.h>
      int abs( int num );

The abs() function returns the absolute value of num. For example:

       int magic_number = 10;
       cout << "Enter a guess: ";
       cin >> x;
       cout << "Your guess was " << abs( magic_number - x ) << " away from the magic number." << endl;

Related topics:
fabs
labs

asin
Syntax:

      #include <math.h>
      double asin( double arg );

The asin() function returns the arc sine of arg. arg should be between -1 and 1.

Related topics:
acos
atan
atan2
cos
cosh
sin
sinh
tan
tanh

atan
Syntax:

      #include <math.h>
      double atan( double arg );

The function atan() returns the arc tangent of arg.

Related topics:
acos
asin
atan2
cos
cosh
sin
sinh
tan
tanh

atan2
Syntax:

      #include <math.h>
      double atan2( double y, double x );

The atan2() function computes the arc tangent of y/x, using the signs of the arguments to compute the quadrant of the return value.

Note the order of the arguments passed to this function.

Related topics:
acos
asin
atan
cos
cosh
sin
sinh
tan
tanh

ceil
Syntax:

      #include <math.h>
      double ceil( double num );

The ceil() function returns the smallest integer no less than num. For example,

       y = 6.04;
       x = ceil( y );

would set x to 7.0.

Related topics:
floor
fmod

cos
Syntax:

      #include <math.h>
      double cos( double arg );

The cos() function returns the cosine of arg, where arg is expressed in radians.

Related topics:
acos
asin
atan
atan2
cosh
sin
sinh
tan
tanh

cosh
Syntax:

      #include <math.h>
      double cosh( double arg );

The function cosh() returns the hyperbolic cosine of arg.

Related topics:
acos
asin
atan
atan2
cos
sin
sinh
tan
tanh

div
Syntax:

      #include <stdlib.h>
      div_t div( int numerator, int denominator );

The function div() returns the quotient and remainder of the operation numerator / denominator. The div_t structure is defined in stdlib.h, and has at least:

       int quot;   // The quotient
       int rem;    // The remainder

For example, the following code displays the quotient and remainder of x/y:

       div_t temp;
       temp = div( x, y );
       printf( "%d divided by %d yields %d with a remainder of %d\n",
               x, y, temp.quot, temp.rem );

Related topics:
ldiv

exp
Syntax:

      #include <math.h>
      double exp( double arg );

The exp() function returns e (2.7182818) raised to the argth power.

Related topics:
log
pow
sqrt

fabs
Syntax:

      #include <math.h>
      double fabs( double arg );

The function fabs() returns the absolute value of arg.

Related topics:
abs
fmod
labs

floor
Syntax:

      #include <math.h>
      double floor( double arg );

The function floor() returns the largest integer not greater than arg. For example,

       y = 6.04;
       x = floor( y );

would result in x being set to 6.0.

Related topics:
ceil
fmod

fmod
Syntax:

      #include <math.h>
      double fmod( double x, double y );

The fmod() function returns the remainder of x/y.

Related topics:
ceil
fabs
floor

frexp
Syntax:

      #include <math.h>
      double frexp( double num, int* exp );

The function frexp() is used to decompose num into two parts: a mantissa between 0.5 and 1 (returned by the function) and an exponent returned as exp. Scientific notation works like this:

       num = mantissa * (2 ^ exp)

Related topics:
ldexp
modf

labs
Syntax:

      #include <stdlib.h>
      long labs( long num );

The function labs() returns the absolute value of num.

Related topics:
abs
fabs

ldexp
Syntax:

      #include <math.h>
      double ldexp( double num, int exp );

The ldexp() function returns num * (2 ^ exp). And get this: if an overflow occurs, HUGE_VAL is returned.

Related topics:
frexp
modf

ldiv
Syntax:

      #include <stdlib.h>
      ldiv_t ldiv( long numerator, long denominator );

Testing: adiv_t, div_t, ldiv_t.

The ldiv() function returns the quotient and remainder of the operation numerator / denominator. The ldiv_t structure is defined in stdlib.h and has at least:

       long quot;  // the quotient
       long rem;   // the remainder

Related topics:
div

log
Syntax:

      #include <math.h>
      double log( double num );

The function log() returns the natural logarithm of num. There's a domain error if num is negative, a range error if num is zero.

Related topics:
exp
log10
pow
sqrt

log10
Syntax:

      #include <math.h>
      double log10( double num );

The log10() function returns the base 10 logarithm for num. There's a domain error if num is negative, a range error if num is zero.

Related topics:
log

modf
Syntax:

      #include <math.h>
      double modf( double num, double *i );

The function modf() splits num into its integer and fraction parts. It returns the fractional part and loads the integer part into i.

Related topics:
frexp
ldexp

pow
Syntax:

      #include <math.h>
      double pow( double base, double exp );

The pow() function returns base raised to the expth power. There's a domain error if base is zero and exp is less than or equal to zero. There's also a domain error if base is negative and exp is not an integer. There's a range error if an overflow occurs.

Related topics:
exp
log
sqrt

sin
Syntax:

      #include <math.h>
      double sin( double arg );

The function sin() returns the sine of arg, where arg is given in radians.

Related topics:
acos
asin
atan
atan2
cos
cosh
sinh
tan
tanh

sinh
Syntax:

      #include <math.h>
      double sinh( double arg );

The function sinh() returns the hyperbolic sine of arg.

Related topics:
acos
asin
atan
atan2
cos
cosh
sin
tan
tanh

sqrt
Syntax:

      #include <math.h>
      double sqrt( double num );

The sqrt() function returns the square root of num. If num is negative, a domain error occurs.

Related topics:
exp
log
pow

tan
Syntax:

      #include <math.h>
      double tan( double arg );

The tan() function returns the tangent of arg, where arg is given in radians.

Related topics:
acos
asin
atan
atan2
cos
cosh
sin
sinh
tanh

tanh
Syntax:

      #include <math.h>
      double tanh( double arg );

The function tanh() returns the hyperbolic tangent of arg.

Related topics:
acos
asin
atan
atan2
cos
cosh
sin
sinh
tan