c++ - Error In string comparsion, Bad Excess c -

i'm trying read file , determine type of calculation perform. read in type string. later use else if (euc.compare(type) == 0) compare it. doesn't work.

here code:

ifstream infile; infile.open(filename.c_str());  // first readin file calcuate on // define needed parameters string word1, word2, word3; string outtype; string type = "tbd"; string euc = "euc_2d";  // want know dimension have int givendimension; int dimen = 0;  cout<<endl<<endl; cout<<"this "<<filename<<endl; cout<<"the information given is:"<<endl;  // read file , determine dimension , type while(infile >> word1) {     //cout<<word1<<endl;     if (word1 == "dimension") {         infile>> word2 >> givendimension;         dimen = givendimension; // dimensional obtianed     }     if (word1 == "dimension:") {         infile>>givendimension;         dimen = givendimension; // dimensional obtianed     }     if (word1 == "edge_weight_type"){         infile>> word2 >> outtype;         type = outtype;     }     if (word1 == "edge_weight_type:"){         infile>> outtype;         type = outtype;     }     if (word1 == "node_coord_section") {         break;     }     if (word1 == "node_coord_section:") {         break;     }  }  cout<<"dimenson  "<<dimen<<endl; cout<<"type  "<<type<<endl;  cout<<dimen<<endl; cout<<type<<endl; // n*n matrix contain each city each city distance  int allcitydistance[(dimen)*(dimen)];  if (type == "geo") { // data int x;          // index of city double y,z;     // use output data double latitude[dimen];     // define latitude number of dimension double longitude[dimen];    // define longitude number of dimension while (infile >> x >> y >> z) {     // obtain y , z given format     // convert latitude , longitude     int index = x-1;     latitude[index] = latitudeandlongitude(y);     longitude[index] = latitudeandlongitude(z);     //printf("city %d has %f , %f\n",x,latitude[index],longitude[index]);  }      int check[dimen][dimen];     (int = 0; < dimen; i++) {         //cout<<i<<"  ";         (int j = 0; j < dimen; j++) {             check[i][j] = abs(caldistance(latitude[i], longitude[i], latitude[j], longitude[j]));             allcitydistance[dimen*(i) + j] = check[i][j];             //cout<<check[i][j]<<"  ";         }         //cout<<endl;     }  }     else if (euc.compare(type) == 0){         // error appear above           // data         int x;          // index of city         double y,z;     // use read in data         double xdirection[dimen], ydirection[dimen];         while (infile >> x >>fixed >> y >>fixed >> z)         {                // obtain y , z given format             // convert latitude , longitude             //cout<<y<<"  "<<z<<endl;             int index = x-1;             xdirection[index] = (y);             ydirection[index] = (z);             //printf("city %d has %f , %f\n",x,xdirection[index],ydirection[index]);         }          double xdifference = 0.0, ydifference = 0.0;         int check[dimen][dimen];         //check[1][1] = 0;         (int = 0; < dimen; i++) {             //cout<<i<<"  ";             (int j = 0; j < dimen; j++) {                 if (i == j) {                     check[i][i] = 0;                 }else{                 xdifference = xdirection[i] - xdirection[j];                 ydifference = ydirection[i] - ydirection[j];                 //cout<<i<<"  "<<xdifference<<"  "<<ydifference;                 check[i][j] = round(sqrt(xdifference*xdifference + ydifference*ydifference));                 }                 allcitydistance[dimen * + j] = round(sqrt(xdifference*xdifference + ydifference*ydifference));                 //cout<<check[i][j]<<"  ";             }             //cout<<endl;         }     } 

i keep getting error:

operator==(const basic_string<_chart,_traits,_allocator>& __lhs,        const _chart* __rhs) _noexcept{   return __lhs.compare(__rhs) == 0;  } 

exc_bad_access

it weird me.

from error logs, i'd 1 or more instances of use of == operator causing problem. usually, exc_bad_access happens when access area of memory not allocated. looking @ conditionals in code, place faulty memory access happen compare word1 against various parameters.

you seem have pre-initialized fine, there shouldn't bad accesses. word1 variable looks suspicious.

are sure being read file? file formatted properly?