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Reading in INformation.
ok im trying to read in this information which is in an input file.
Ray L. Jones 3942 6 4 1974 3 2 2001
Alice K. Brown 8300 4 8 1969 2 1 1999
Gill R. Alante 4301 8 2 1972 6 5 2000
Now here is my code:
Code:
#include <iostream>
#include <fstream>
#include <string>
using std::string;
using std::cout;
using std::endl;
int main()
{
ifstream inFile("input.dat", ios::in);
if(!inFile)
{
cout << "Could not open the file "
<< "for input.\n";
exit(1);
}
else
cout << "The file input.dat is open for
input.\n\n";
string firstName;
string lastName;
string middleInitial;
string employeeID;
string bmn; // Birth Month
string bdy; // Birth Day
string byr // Birth Year
string hmn; // Hire Month
string hdy; // Hire Day
string hyr; // Hire Year
for(int index = 0 index < 3; index++)
{
inFile >> firstName >> middleInitial >> lastName >> employeeID>>bmn
>>bdy>>byr>>hmn>>hdy>>hyr;
}
return 0;
}
I am using vc++ compiler and i keep gettin errors like 32 of them.
Can someone help me please.
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Other than maybe that exit() may not be in your header files as listed, and maybe trying
using namespace std;
as a simplyfing statement instead of the individual using statements until you can figure out what is going on
and maybe declaring index outside the for loop (I've heard it can cause problems sometimes when declared inside the loop like that)
your code looks like it should work so it would be nice to have a listing of the first error report or two. Often if you can fix the first one or two errors the others go away, too.
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Code:
#include <iostream>
#include <fstream>
#include <string>
int main()
{
ifstream inFile("input.dat", ios::in);
if(!inFile)
{
cerr << "Could not open the file "
<< "for input.\n";
return 1;
}
else
cout << "The file input.dat is open for
input.\n\n";
int index;
string firstName;
string lastName;
string middleInitial;
string employeeID;
string bmn; // Birth Month
string bdy; // Birth Day
string byr // Birth Year
string hmn; // Hire Month
string hdy; // Hire Day
string hyr; // Hire Year
for(int index = 0; index < 3; index++)
{
inFile >> firstName >> middleInitial >> lastName >> employeeID>>bmn
>>bdy>>byr>>hmn>>hdy>>hyr;
}
return 0;
}
ompiling...
test.cpp
C:\Documents and Settings\Massa\test.cpp(11) : error C2065: 'ifstream' : undeclared identifier
C:\Documents and Settings\Massa\test.cpp(11) : error C2146: syntax error : missing ';' before identifier 'inFile'
C:\Documents and Settings\Massa\test.cpp(11) : error C2065: 'inFile' : undeclared identifier
C:\Documents and Settings\Massa\test.cpp(11) : error C2653: 'ios' : is not a class or namespace name
C:\Documents and Settings\Massa\test.cpp(11) : error C2065: 'in' : undeclared identifier
C:\Documents and Settings\Massa\test.cpp(15) : error C2065: 'cerr' : undeclared identifier
C:\Documents and Settings\Massa\test.cpp(16) : error C2297: '<<' : illegal, right operand has type 'char [25]'
C:\Documents and Settings\Massa\test.cpp(20) : error C2065: 'cout' : undeclared identifier
C:\Documents and Settings\Massa\test.cpp(20) : error C2001: newline in constant
C:\Documents and Settings\Massa\test.cpp(21) : error C2297: '<<' : illegal, right operand has type 'char [32]'
C:\Documents and Settings\Massa\test.cpp(21) : error C2146: syntax error : missing ';' before identifier 'input'
C:\Documents and Settings\Massa\test.cpp(21) : error C2065: 'input' : undeclared identifier
C:\Documents and Settings\Massa\test.cpp(21) : error C2017: illegal escape sequence
C:\Documents and Settings\Massa\test.cpp(21) : error C2017: illegal escape sequence
C:\Documents and Settings\Massa\test.cpp(21) : error C2228: left of '.n' must have class/struct/union type
C:\Documents and Settings\Massa\test.cpp(21) : error C2001: newline in constant
C:\Documents and Settings\Massa\test.cpp(21) : error C2146: syntax error : missing ';' before identifier 'n'
C:\Documents and Settings\Massa\test.cpp(21) : error C2143: syntax error : missing ';' before 'string'
C:\Documents and Settings\Massa\test.cpp(23) : error C2144: syntax error : missing ';' before type 'int'
C:\Documents and Settings\Massa\test.cpp(26) : error C2065: 'string' : undeclared identifier
C:\Documents and Settings\Massa\test.cpp(26) : error C2146: syntax error : missing ';' before identifier 'firstName'
C:\Documents and Settings\Massa\test.cpp(26) : error C2065: 'firstName' : undeclared identifier
C:\Documents and Settings\Massa\test.cpp(27) : error C2146: syntax error : missing ';' before identifier 'lastName'
C:\Documents and Settings\Massa\test.cpp(27) : error C2065: 'lastName' : undeclared identifier
C:\Documents and Settings\Massa\test.cpp(28) : error C2146: syntax error : missing ';' before identifier 'middleInitial'
C:\Documents and Settings\Massa\test.cpp(28) : error C2065: 'middleInitial' : undeclared identifier
C:\Documents and Settings\Massa\test.cpp(29) : error C2146: syntax error : missing ';' before identifier 'employeeID'
C:\Documents and Settings\Massa\test.cpp(29) : error C2065: 'employeeID' : undeclared identifier
C:\Documents and Settings\Massa\test.cpp(30) : error C2146: syntax error : missing ';' before identifier 'bmn'
C:\Documents and Settings\Massa\test.cpp(30) : error C2065: 'bmn' : undeclared identifier
C:\Documents and Settings\Massa\test.cpp(31) : error C2146: syntax error : missing ';' before identifier 'bdy'
C:\Documents and Settings\Massa\test.cpp(31) : error C2065: 'bdy' : undeclared identifier
C:\Documents and Settings\Massa\test.cpp(33) : error C2146: syntax error : missing ';' before identifier 'byr'
C:\Documents and Settings\Massa\test.cpp(33) : error C2065: 'byr' : undeclared identifier
C:\Documents and Settings\Massa\test.cpp(33) : error C2146: syntax error : missing ';' before identifier 'string'
C:\Documents and Settings\Massa\test.cpp(33) : error C2146: syntax error : missing ';' before identifier 'hmn'
C:\Documents and Settings\Massa\test.cpp(33) : error C2065: 'hmn' : undeclared identifier
C:\Documents and Settings\Massa\test.cpp(34) : error C2146: syntax error : missing ';' before identifier 'hdy'
C:\Documents and Settings\Massa\test.cpp(34) : error C2065: 'hdy' : undeclared identifier
C:\Documents and Settings\Massa\test.cpp(35) : error C2146: syntax error : missing ';' before identifier 'hyr'
C:\Documents and Settings\Massa\test.cpp(35) : error C2065: 'hyr' : undeclared identifier
C:\Documents and Settings\Massa\test.cpp(37) : error C2086: 'index' : redefinition
C:\Documents and Settings\Massa\test.cpp(40) : warning C4552: '>>' : operator has no effect; expected operator with side-effect
Error executing cl.exe.
test.exe - 42 error(s), 1 warning(s)
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>>using namespace std;
or use another similar method
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i don't understand what your saying
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Code:
#include <iostream>
#include <fstream>
#include <string>
using namespace std;
int main()
{
/* .... */
The compiler doesn't know what the classes are because it can't find them within its scope. By using namespace std, it will look at the std classes. This will help solve some of your problems. There are others ways to do this as well.
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Code:
#include <iostream.h>
#include <fstream.h>
#include <string.h>
using std :: string;
int main()
{
ifstream inFile("input.dat", ios::in);
if(!inFile)
{
cout << "Could not open the file ";
return 1;
}
else
cout << "The file is open";
string firstName;
string lastName;
string middleInitial;
string employeeID;
string bmn; // Birth Month
string bdy; // Birth Day
string byr; // Birth Year
string hmn; // Hire Month
string hdy; // Hire Day
string hyr; // Hire Year
while(inFile >> firstName >> middleInitial >> lastName >> employeeID>>bmn
>>bdy>>byr>>hmn>>hdy>>hyr)
{
cout<<firstName<<endl;
}
return 0;
}
Still getting errors.
Compiling...
test.cpp
C:\Documents and Settings\Massa\test.cpp(5) : error C2653: 'std' : is not a class or namespace name
C:\Documents and Settings\Massa\test.cpp(5) : error C2873: 'string' : symbol cannot be used in a using-declaration
C:\Documents and Settings\Massa\test.cpp(24) : error C2065: 'string' : undeclared identifier
C:\Documents and Settings\Massa\test.cpp(24) : error C2146: syntax error : missing ';' before identifier 'firstName'
C:\Documents and Settings\Massa\test.cpp(24) : error C2065: 'firstName' : undeclared identifier
C:\Documents and Settings\Massa\test.cpp(25) : error C2146: syntax error : missing ';' before identifier 'lastName'
C:\Documents and Settings\Massa\test.cpp(25) : error C2065: 'lastName' : undeclared identifier
C:\Documents and Settings\Massa\test.cpp(26) : error C2146: syntax error : missing ';' before identifier 'middleInitial'
C:\Documents and Settings\Massa\test.cpp(26) : error C2065: 'middleInitial' : undeclared identifier
C:\Documents and Settings\Massa\test.cpp(27) : error C2146: syntax error : missing ';' before identifier 'employeeID'
C:\Documents and Settings\Massa\test.cpp(27) : error C2065: 'employeeID' : undeclared identifier
C:\Documents and Settings\Massa\test.cpp(28) : error C2146: syntax error : missing ';' before identifier 'bmn'
C:\Documents and Settings\Massa\test.cpp(28) : error C2065: 'bmn' : undeclared identifier
C:\Documents and Settings\Massa\test.cpp(29) : error C2146: syntax error : missing ';' before identifier 'bdy'
C:\Documents and Settings\Massa\test.cpp(29) : error C2065: 'bdy' : undeclared identifier
C:\Documents and Settings\Massa\test.cpp(30) : error C2146: syntax error : missing ';' before identifier 'byr'
C:\Documents and Settings\Massa\test.cpp(30) : error C2065: 'byr' : undeclared identifier
C:\Documents and Settings\Massa\test.cpp(31) : error C2146: syntax error : missing ';' before identifier 'hmn'
C:\Documents and Settings\Massa\test.cpp(31) : error C2065: 'hmn' : undeclared identifier
C:\Documents and Settings\Massa\test.cpp(32) : error C2146: syntax error : missing ';' before identifier 'hdy'
C:\Documents and Settings\Massa\test.cpp(32) : error C2065: 'hdy' : undeclared identifier
C:\Documents and Settings\Massa\test.cpp(33) : error C2146: syntax error : missing ';' before identifier 'hyr'
C:\Documents and Settings\Massa\test.cpp(33) : error C2065: 'hyr' : undeclared identifier
Error executing cl.exe.
test.exe - 23 error(s), 0 warning(s)
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I would replace
using std:: string;
with
using namespace std;
and recompile. If most of your errors go away, and I suspect they will, then go back to trying to reduce contamination of global space, but try proving the problem is here first.
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still got the same errors
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I notice in your most recent post that the headers have all obtained a .h extension. When using namespace std it is best to avoid .h extensions whenever possible, and all the files included are available without the .h extension. If you truly tried compiling with the .h extensions and with the using namespace std line, the errors would persist.
The style as I understand it is to list individual functions or variables but not individual files:
so
#include <iostream>
#include <string>
using namespace std;
.
.
.
or
#include <iostream>
#include <string>
using std::cout;
.
.
.
but not
#include <iostream>
#include <string>
using std:: string;
.
.
.
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well im done with using c++ style i\o im using c now but im getting 2 errors
Code:
#include<fstream.h> // ifstream,ofstream
#include<iomanip.h>
#include<stdio.h> // setw
#include<iostream.h> // cout, cin, cerr
#include<stdlib.h> // exit()
#include<string.h>
// string
int main(void)
{
char *firstName;
char *lastName;
char *middleInitial;
char *employeeID;
char *bmn; // Birth Month
char *bdy; // Birth Day
char *byr; // Birth Year
char *hmn; // Hire Month
char *hdy; // Hire Day
char *hyr; // Hire Year
ifstream inFile("input.dat", ios::in);
if(!inFile)
{
cout << "Could not open the file ";
return 1;
}
else
cout << "The file is open";
while(!inFile)
{
fscanf(inFile,"%s %s,%s,%s,%s.%s,%s,%s,%s,%s",firstName,
lastName,middleInitial,employeeID,bmn,bdy.byr,hmn,hdy,hyr);
printf("%s\n",firstName);
}
return 0;
}
Compiling...
test.cpp
C:\Documents and Settings\Massa\test.cpp(42) : error C2228: left of '.byr' must have class/struct/union type
C:\Documents and Settings\Massa\test.cpp(42) : error C2664: 'fscanf' : cannot convert parameter 1 from 'class ifstream' to 'struct _iobuf *'
No user-defined-conversion operator available that can perform this conversion, or the operator cannot be called
Error executing cl.exe.
test.exe - 2 error(s), 0 warning(s)
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Code:
#include <iostream>
#include <fstream>
#include <string>
#include <cstdlib>
using namespace std;
int main()
{
ifstream inFile("input.dat", ios::in);
if(!inFile)
{
cout << "Could not open the file "
<< "for input.\n";
exit(1);
}
else
cout << "The file input.dat is open for input.\n\n";
string firstName;
string lastName;
string middleInitial;
string employeeID;
string bmn; // Birth Month
string bdy; // Birth Day
string byr; // Birth Year
string hmn; // Hire Month
string hdy; // Hire Day
string hyr; // Hire Year
for(int index = 0; index < 3; index++)
{
inFile >> firstName >> middleInitial >> lastName >> employeeID>>bmn
>>bdy>>byr>>hmn>>hdy>>hyr;
}
return 0;
}
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now i hope you realise that the bottom for loop will not quite be doing what you think.You will need to alter that to read in the values correctly.
As for your last attempt its an abortion. you are mixing c and c++ io. if you want to use fscanf() then you need to open the file with fopen() and not ifstreams constructor.
The other error is due to a typo in the fscanf(). A . instead of a , but you should have seen that yourself.
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