Calculates the cube root of a number #include <math.h> double cbrt ( double x ); float cbrtf ( float x ); long double cbrtl ( long double x ); 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", sma_km ); See Alsosqrt( ), hypot( ), pow( ) |