#include<iostream.h>
double grav (double m1, double m2, double distance)
double g, G=6.67259E-11；
g=G*m1*m2/(distance*distance);
return g
void main ()
double g, Msum=7.987E30,Mearth=5.975E24;
g=grav(Msun, Mearth, 1.495E11);
cout<<"The gravitation between sun and earth is"<<g<<"N."<<end|;