This section will cover the Math elements of the C Standard Library. 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 The acos() function returns the arc cosine of arg, which will be in the range [0, pi]. If arg is outside this range, acos() returns NAN and raises a floating-point exception. Related topics asin - atan - atan2 - cos - cosh - sin - sinh - tan - tanh The asin() function returns the arc sine of arg, which will be in the range [-pi/2, +pi/2]. If arg is outside this range, asin() returns NAN and raises a floating-point exception. Related topics acos - atan - atan2 - cos - cosh - sin - sinh - tan - tanh The function atan() returns the arc tangent of arg, which will be in the range [-pi/2, +pi/2]. Related topics acos - asin - atan2 - cos - cosh - sin - sinh - tan - tanh The atan2() function computes the arc tangent of y/x, using the signs of the arguments to compute the quadrant of the return value. Related topics acos - asin - atan - cos - cosh - sin - sinh - tan - tanh 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 The cos() function returns the cosine of arg, where arg is expressed in radians. The return value of cos() is in the range [-1,1]. If arg is infinite, cos() will return NAN and raise a floating-point exception. Related topics acos - asin - atan - atan2 - cosh - sin - sinh - tan - tanh The function cosh() returns the hyperbolic cosine of arg. Related topics acos - asin - atan - atan2 - cos - sin - sinh - tan - tanh The function div() returns the quotient and remainder of the operation numerator / denominator. The div_t structure is defined in cstdlib, 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 The exp() function returns e (2.7182818) raised to the argth power. Related topics log - pow - sqrt The function fabs() returns the absolute value of arg. Related topics abs - fmod - labs The function floor() returns the largest integer value not greater than arg. // Example for positive numbers y = 6.04; x = floor( y ); would result in x being set to 6 (double 6.0). // Example for negative numbers y = -6.04; x = floor( y ); would result in x being set to -7 (double -7.0). Related topics ceil - fmod The fmod() function returns the remainder of x/y. Related topics ceil - fabs - floor 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 The function labs() returns the absolute value of num. Related topics abs - fabs The ldexp() function returns num * (2 ^ exp). And get this: if an overflow occurs, HUGE_VAL is returned. Related topics frexp - modf 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 cstdlib and has at least: long quot; // the quotient long rem; // the remainder Related topics div The function log() returns the natural (base e) logarithm of num. There's a domain error if num is negative, a range error if num is zero. In order to calculate the logarithm of x to an arbitrary base b, you can use: double answer = log(x) / log(b); Related topics exp - log10 - pow - sqrt The log10() function returns the base 10 (or common) logarithm for num. There will be a domain error if num is negative and a range error if num is zero. Related topics log 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 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 If you don't want cmath you can write sin function it is; include  using namespace std; double sin(double x) //sin function {return x-((x*x*x)/6.)+((x*x*x*x*x)/120. );} int main () { double a; cin>>a; cout<<"sin("< #include  int main (){ double c, p; c = log(2.0); p = tanh (c); printf ("The hyperbolic tangent of %lf is %lf.\n", c, p ); return 0; } The function tanh() returns the hyperbolic tangent of arg. Related topics acos - asin - atan - atan2 - cos - cosh - sin - sinh - tan
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