C++ How to Program, 10/e

... positioning the get file-position pointer are

// position to the nth byte of fileObject (assumes ios::beg)
fileObject.seekg(n);
// position n bytes in fileObject
fileObject.seekg(n, ios::cur);
// position n bytes back from end of fileObject
fileObject.seekg(n, ios::end);
// position at end of fileObject
fileObject.seekg(0, ios::end);

The same operations can be performed using ostream member function seekp. Member functions tellg and tellp are provided to return the current locations of the get and put pointers, respectively. The following statement assigns the get file-position pointer value to variable location of type long:

location = fileObject.tellg();

14.4.4 Case Study: Credit Inquiry Program

Figure 14.6 enables a credit manager to display the ...