how to fix the code? C++

G C:\Users\jail OneDrive Desktop\Computational PhyClass work 2.cpp - Dev-C++ 5.11 File Edit Search View Project Execute Tools Style Window Help globale Untitled1 Class work 2.cpp Class work 1.cpp 1 #include 3 #include $ 4 5 using namespace std; int main() I DI U 10 double polint (double x, double x1(), double y![], int isize, int npoints) 11 12 double lambda[isize]; double y 14 15 int 1. is, 113 16 // check order of Interpolation 17 if (npoints > {size) npoints - Isizej 18 1 fx is ouside the interval 19 1F (* do]) return y - yi[@]> if (x > disize-1]) return y - yilisize-1]; 21 // Loop to find so that [j-1) x x[3] 22 jej 23 while (isite-1) 24 25 if (x1[3] > ) break 26 1.1.1 27 28 BB Compiler) Resources Compile Log Debug Find Results Close Line Col File Message CAUsers\ial OneDrive Desktop Computational Phyl to function 'int main": 10 74 CAUsers OneDrive Desktop Computational Phycle. Error) a function definition is not allowed here before taken 46 CAUsers OneDrive Desktop Computational PhyCla... [Error] expected "Y at end of input 1 C:\Users OneDrive\Desktop Computational Phyclass work 2.cpp - Dev-C++ 5.11 File Edit Search View Project Execute Tools AStyle Window Help globals Untitled Class work 2.cpp Class work 1.cpp if (x >- x[isize-1]) return y - yi[size-1]) 21 // Loop to find so that (3-1) - *) break; -j.15 > 28 29 1/ shift to correspond to (npoint-1) th interpolation 30 1-3 npoints/2; 31 11 fis ous ide of the range [,... (size-1) 32 if isize-1 ) -isire-npoints) 34 y-e.es 35 for (is - 1 is unpoints 1) is - 15:1) 36 37 lambdalis) - 1.4) 38 for (si - il cft npoints 1, il - 11.1) 39 [ if(11 !- is) lambda[is] - lambda[is] 41 (x-x[11])/(xi[is] xd[1]); 42 Y .y . yi[15]"lambda[ 1s]) 44 45 return y 46 47 be BB Compiler (3) Resources de Compile Log Debug Find Results Close Line Col File Message C:\Users\iailOneDrive\Desktop\Computational Phyl. In function 'int main's 10 74 CAUsers OneDrive Desktop Computational Phycia. Errora function definition is not allowed here before I token 46 1 C:\Usersiai OneDrive Desktop Computational Phy Cla... [Error] expected at end of input 40$