Name
cbrt
Synopsis
Calculates the cube root of a number
#include <math.h> doublecbrt
( doublex
); floatcbrtf
( floatx
); long doublecbrtl
( long doublex
);
The cbrt()
functions return
the cube root of their argument x
.
Example
#define KM_PER_AU (149597870.691) // An astronomical unit is the mean
// distance between Earth and Sun:
// about 150 million km.
#define DY_PER_YR (365.24)
double dist_au, dist_km, period_dy, period_yr;
printf( "How long is a solar year on your planet (in Earth days)?\n" );
scanf( "%lf", &period_dy );
period_yr = period_dy / DY_PER_YR;
dist_au =cbrt
( period_yr * period_yr ); // by Kepler's Third Law
dist_km = dist_au * KM_PER_AU;
printf("Then your planet must be about %.0lf km from the Sun.\n", dist_km );
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