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55行：我寫了」V =（pow（vx，2）+ pow（vy，2））^ 0.5 ;「錯誤：無效的操作數到二進制表達式（「double」和double「）是什麼意思？
我有錯誤：無效的操作數到二進制表達式（」雙「和雙」）。這是什麼意思？
請幫忙！
INT主要（）{
FILE *fp, *fopen();
fp=fopen("Orbit2", "w");
double M,G,y0,vx,vy,x,y,h,t,T,m,V, positionx,positiony,velocityx,velocityy,energy,kinetic,potential;
G=6.67*pow(10,-11);
h=1000;
m=7.345*pow(10,22);
t=0;
M=1.99*pow(10,30);
y=0;
y0=0;
x=1.5*pow(10,11);
vx=0;
vy=22350;
energy=kinetic+potential;
T=t+h;
for (T=0; T<110000; T++)
{
printf("y=%lf,x=%lf\n", y,x);
fprintf(fp,"%lf,%lf\n", y,x);
V=(pow(vx,2)+pow(vy,2))^0.5;
positionx=x+(h/(double)6.0)*((kx1(vx))+(2*kx2(G,M,h,x,y,vx))+(2*kx3(G,M,h,x,y,vx,vy))+(kx4(G,M,h,x,y,vx,vy)));
positiony=y+(h/(double)6.0)*((ky1(vy))+(2*ky2(G,M,h,x,y,vy))+(2*ky3(G,M,h,x,y,vx,vy))+(ky4(G,M,h,x,y,vx,vy)));
velocityx=vx+(h/(double)6.0)*((kvx1(G,M,x,y))+(2*kvx2(G,M,h,x,y,vx,vy))+(2*kvx3(G,M,h,x,y,vx,vy))+(kvx4(G,M,h,x,y,vx,vy)));
velocityy=vy+(h/(double)6.0)*((kvy1(G,M,x,y))+(2*kvy2(G,M,h,x,y,vx,vy))+(2*kvy3(G,M,h,x,y,vx,vy))+(kvy4(G,M,h,x,y,vx,vy)));
x=positionx;
y=positiony;
vx=velocityx;
vy=velocityy;
if ((fabs(positiony-y0)<100) && (fabs(positionx-x)<100))
{
break;
}
}
fclose(fp);
return 0;
}