c++ - Error: Invalid conversion from 'int' to 'const char*' -


the compiler gives me error: "invalid conversion 'int' 'const char*'. offending line is:

change[j]=oper[integer(a[i][j]+a[i][j+1])][0];

where trouble?

#include <iostream> #include <sstream> #include <vector>  using namespace std;  string mas[10000000],oper[100];  int integer(string a) {     int numb;     istringstream(a)>>numb;     return numb; }  int main() {     int l,k,i,d=0;     string temp1,temp2,s,t,ans="-1",change;     vector<string> a,b;     (i=0;i<10000000;++i)     mas[i]="-1";     (i=0;i<100;++i)         oper[i]="-1";     cin>>l>>s>>t>>k;     (i=0;i<k;++i)     {         cin>>temp1>>temp2;         oper[integer(temp1)]=temp2;     }     a.push_back(s);     while(a.size()>0)     {         if (ans!="-1")             break;         (i=0;i<a.size();++i)         {             if (ans!="-1")                 break;             (int j=0;j<l-1;++j)             {                 change=a[i];                 change[j]=oper[integer(a[i][j]+a[i][j+1])][0];                 change[j+1]=oper[integer(a[i][j]+a[i][j+1])][1];                 if(oper[integer(a[i][j]+a[i][j+1])]!="-1" && mas[integer(change)]!="-1")             {                 if (mas[integer(change)]==t)                 {                     ans=d;                     break;                 }                 mas[integer(change)]=d+1;                 b.push_back(change);             }         }     }     a=b;     b.clear();     }     cout<<ans<<endl;;     return 0; }

integer converts string int. passing in char, not string.


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