Scope of variables
Nov 27, 2015 at 5:45am UTC
Hello everyone I'm a newbie to c++ programming. I was given an assignment to create a address book with 4 functions.(adding new contact, delete contact, edit relationship based on address, and edit phone number based on the name of contact). However, when i export the file(to new_contact.txt), it cannot sense to changes of the contact book. Can someone please help?
Here's the code:
1 #include <iostream>
#include <fstream>
#include <string>
using namespace std;
int main()
{
string peo;
string mob;
string add;
string rel;
string phone;
string format;
string change;
string personal;
int testfor1=-1;
int testfor2=-1;
int testfor3=-1;
int testfor4=-1;
int sup;
int test;
int orange;
int n;
test=2;
int az;
int sake;
int i=0;
int q;
int a;
int loop;
int ed;
int input;
cout<<"Options:" <<endl;
cout<<"1. Add a contact" <<endl;
cout<<"2. Delete a contact" <<endl;
cout<<"3. Edit relationship based on the address" <<endl;
cout<<"4. Edit the phone number of a contact" <<endl;
cout<<"0. Exit" <<endl;
while (test>1)
{
ifstream addressbook;
addressbook.open("contact.txt" );
int j=0;
string name[50];
string mobile[50];
string address[50];
string relationship[50];
while (addressbook>>name[i])
{
addressbook>>mobile[i]>>address[i]>>relationship[i];
j=j+1;
i=i+1;
}
cout<<"Select an option <0-4>: " ;
cin>>input;
switch (input)
{
case 0:
{
ofstream output;
output.open("new_contact.txt" );
{
for (ed=0;ed<i;ed++)
{
output<<name[ed]<<" " <<mobile[ed]<<" " <<address[ed]<<" " <<relationship[ed]<<endl;
}
}
return 0;
}
break ;
case 1:
{
int apple;
apple=0;
orange=0;
int pear;
pear=0;
int grape;
grape=0;
n=i;
string bu;
cout<<"Input the name, phone number, address, relationship one by one:" <<endl;
cin>>name[n];
cin>>mobile[n];
cin>>address[n];
cin>>relationship[n];
if (i>=49)
{
cout<<"Too many contacts!" <<endl;
}
else
{
for (a=0;a<i;a++)
{
if (name[a]!=name[n])
{
orange=1;
}
else
{
orange=0;
break ;
}
}
if (orange==0)
{
cout<<"The contact has already in the address book!" <<endl;
name[n]=" " ;
mobile[n]=" " ;
address[n]=" " ;
relationship[n]=" " ;
}
else
{
n++;
i++;
peo=name[n];
mob=mobile[n];
add=address[n];
rel=relationship[n];
testfor1=2;
}
}
}
break ;
case 2:
{
int vanish;
int x=0;
string temp;
string qwerty;
cout<<"Input the name of the contact you want to delete:" <<endl;
cin>>qwerty;
for (q=0;q<i;q++)
{
if (qwerty==name[q])
{
x=1;
break ;
}
else
{
x=0;
}
}
if (x==1)
{
cout<<qwerty<<" deleted!" <<endl;
for (int again=0;q<i;q++)
{
name[q]=name[q+1];
mobile[q]=mobile[q+1];
address[q]=address[q+1];
relationship[q]=relationship[q+1];
}
i=i-1;
testfor2=2;
}
else
{
cout<<"The contact doesn't exist!" <<endl;
}
}
break ;
case 3:
{
cout<<"Input the substring of the address you want to find and the relationship you want to change to:" <<endl;
cin>>change;
cin>>format;
for (int p=0;p<i;p++)
{
if (change==address[p])
{
relationship[p]=format;
testfor3=2;
}
else
{
continue ;
}
}
}
break ;
case 4:
{
cout<<"Input the name of the contact and the phone number you want to change to:" <<endl;
cin>>personal;
cin>>phone;
int lol;
lol=0;
az=0;
for (int cheers=0;az<i;az++)
{
if (personal!=name[az])
{
lol=1;
}
else
{
lol=0;
break ;
}
}
if (lol==0)
{
mobile[az]=phone;
testfor4=2;
}
else
{
cout<<"The contact doesn't exist!" <<endl;
}
lol=0;
}
break ;
}
}
}
Nov 27, 2015 at 8:07am UTC
You read from contact.txt but write to new_contact.txt. These are two different files.
Nov 27, 2015 at 8:36am UTC
The problem is that you read from the file ["contact.txt"] each time before you make changes, but you do not write those changes back [to "contact.txt"].before the loop or you write back the changes.
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