ISBN13和ISBN10的转换

#include <iostream>using namespace std;
int main(){
int a,b,c,d,e,f,g,h,i,j,k,l,m,S,N,M;    cin>>a>>b>>c>>d>>e>>f>>g>>h>>i>>j>>k>>l>>m;    
int checksum = 10-(a*1+b*3+c*1+d*3+e*1+f*3+g*1+h*3+i*1+j*3+k*1+l*3)%10;    if(checksum == m)    
{        
int finnal_bit = 11-(10*d+9*e+8*f+7*g+6*h+5*i+4*j+3*k+2*l)%11;        if(finnal_bit == 10)            cout<<d<<e<<f<<g<<h<<i<<j<<k<<l<<'x';        
else if(finnal_bit == 11)            cout<<d<<e<<f<<g<<h<<i<<j<<k<<l<<0;        
else            cout<<d<<e<<f<<g<<h<<i<<j<<k<<l<<finnal_bit;    
}    
else    
{       
cout<<"Error";    
}    
return 0;    
}