Help! C programming...#include #include #define NT double NT f(NT x, NT y) { return x+y; } NT rkstep (NT (*func)(NT, NT), NT x, NT y[], NT h, int n, NT *err[]) { NT k[n], y12[n], y1[n], k12[n]; k[n]=(*func)(x,y[n]); y12[n]=y[n]+k[n]*h/2; k12[n]=(*func)(x,y12[n]); y1[n]=y[n]+k12[n]*h; *err[n]=fabs(k[n]-k12[n])*h/2; return y1[n]; } int main () { int n; NT x, y[n], h, *err[n], result[n]; x=1; y[0]=10; for (n=0;n (more...)