Function returns the arc cosine of parameter x; that is, the value whose cosine is x. The input parameter x must be between -1 and 1 (inclusive). The return value is in radians, between 0 and Π (inclusive).

doub = acos(0.5);  // doub = 1.047198

Function returns the arc sine of parameter x; that is, the value whose sine is x. The input parameter x must be between -1 and 1 (inclusive). The return value is in radians, between -Π/2 and Π/2 (inclusive).

doub = asin(0.5);  // doub = 5.235987e-1

Function computes the arc tangent of parameter f; that is, the value whose tangent is f. The return value is in radians, between -Π/2 and Π/2 (inclusive).

doub = atan(1.0);  // doub = 7.853982e-1

This is the two-argument arc tangent function. It is similar to computing the arc tangent of x/y, except that the signs of both arguments are used to determine the quadrant of the result and y is permitted to be zero. The return value is in radians, between -Π and Π (inclusive).

doub = atan2(2., 1.);  // doub = 4.636475e-1

Function returns value of parameter x rounded up to the next whole number.

doub = ceil(0.5);  // doub = 1.000000

Function returns the cosine of f in radians. The return value is from -1 to 1.

doub = cos(PI/3.);  // doub = 0.500008

Function returns the hyperbolic cosine of x, defined mathematically as (ex+e-x)/2. If the value of x is too large (if overflow occurs), the function fails.

doub = cosh(PI/3.);  // doub = 1.600286

Function returns the value of e — the base of natural logarithms — raised to the power x (i.e. ex).

doub = exp(0.5);   // doub = 1.648721

Function returns the absolute (i.e. positive) value of d.

doub = fabs(-1.3);  // doub = 1.3

Function returns the value of parameter x rounded down to the nearest integer.

doub = floor(15.258);  // doub = 15.000000

Function splits a floating-point value into a normalized fraction and an integral power of 2. The return value is the normalized fraction and the integer exponent is stored in the object pointed to by eptr.

Function returns the result of multiplying the floating-point number num by 2 raised to the power n (i.e. returns x * 2n).

doub = ldexp(2.5, 2);  // doub = 10

Function returns the natural logarithm of x (i.e. loge(x)).

doub = log(10);  // doub = 2.302585E

Function returns the base-10 logarithm of x (i.e. log10(x)).

doub = log10(100.);  // doub = 2.000000

Function returns the signed fractional component of val, placing its whole number component into the variable pointed to by iptr.

doub = modf(6.25, &iptr);  // doub = 0.25, iptr = 6.00 

Function returns the value of x raised to the power y (i.e. xy).

doub = pow(10.,5.);  // doub = 9.999984e+4

Function returns the sine of f in radians. The return value is from -1 to 1.

doub = sin(PI/2.);  // doub = 1.000000

Function returns the hyperbolic sine of x, defined mathematically as (ex-e-x)/2. If the value of x is too large (if overflow occurs), the function fails.

doub = sinh(PI/2.);  // doub = 2.301296

Function returns the non negative square root of x.

doub = sqrt(10000.);   // doub = 100.0000

Function returns the tangent of x in radians. The return value spans the allowed range of floating point in the mikroC PRO for AVR.

doub = tan(PI/4.);  // doub = 0.999998

Function returns the hyperbolic tangent of x, defined mathematically as sinh(x)/cosh(x).

doub = tanh(-PI/4.);   // doub = -0.655793