c++ ifstream with a variable filename -

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i'm trying open file wich name composed constant , variable parts.

my actual code 

char filename[100]; char extension1[] = ".pdb"; vector<string> id;  //code find ids(it works)  sprintf(filename, "/home/giovanni/scrivania/enzimi/ligan/%s", id[1].c_str()); sprintf(filename, "%s%s", filename,extension1);

the problem filenames becomes

.pdbe/giovanni/scrivania/enzimi/ligan/102m

instead of

/home/giovanni/scrivania/enzimi/ligan/102m.pdb

tnx in advance

simply use std::string:

string filename = "/home/giovanni/scrivania/enzimi/ligan/" + id[1] + ".pdb";  ...  std::ifstream file(filename.c_str());

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