//* floating point calculations (large embedded systems only) *
#include <stdio.h>
#include <math.h>

int main() {
    double x;

    printf("Please enter a floating point value ");
    scanf("%lf", &x);

    printf("fabs  %lf\n", fabs(x) );    // see also abs(x)
    printf("abs   %lf\n", abs(x) );     // returns int instead of double!!
    printf("abs   %d\n",  abs(x) );     // truncates to int and returns int!!

    printf("sqrt  %lf\n", sqrt(x) );    // x>=0 (see what happens for x<=0)
    printf("pow   %lf\n", pow(x-1,0.5));// postive value argument required for non integer exponent, i.e. x-1>=0
    printf("pow   %lf\n", pow(x-1,3) ); // for integer exponent that requirement is up to the library, safer: x-1>=0

    printf("exp   %lf\n", exp(x) );     // any x
    printf("log   %lf\n", log(x) );     // x>0
    printf("log10 %lf\n", log10(x) );   // x>0



    printf("floor %lf\n", floor(x) );   // floor(-4.9)=-5, floor(4.9)=4
    printf("ceil  %lf\n", ceil(x) );    // ceil(-4.9)=-4, ceil(4.9)=5
                                        // no truncate or round up function!!

    printf("sin   %lf\n", sin(x) );     // any x, in radians
    printf("sinh  %lf\n", sinh(x) );    // any x, in radians
    printf("asin  %lf\n", asin(x) );    // -1<=x<=1, result in radians
    printf("cos   %lf\n", cos(x)  );    // any x, in radians
    printf("cosh  %lf\n", cosh(x) );    // any x, in radians
    printf("acos  %lf\n", acos(x) );    // -1<=x<=1, result in radians
    printf("tan   %lf\n", tan(x)  );    // any x, in radians
    printf("tanh  %lf\n", tanh(x) );    // any x, in radians
    printf("atan  %lf\n", atan(x) );    // any x, result in radians

    printf("1/x   %lf\n", 1/x );        // x!=0 (see what happens for x==0)

    return(0);
}