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POproblem in writing to a file
primarykey
Id
5686986
data
AcceptedAnswerId
0
AnswerCount
4
ClosedDate
CommentCount
10
CommunityOwnedDate
CreationDate
2011-04-16T14:01:53.897
FavoriteCount
0
LastActivityDate
2011-04-16T17:03:27.590
LastEditDate
2011-04-16T15:16:27.340
LastEditorUserId
427763
OwnerUserId
646248
ParentId
0
PostTypeId
1
Score
0
ViewCount
326
LastEditorDisplayName
text
Body
Guys I wrote the following code for implementing a phonebook in c++ What I am doing is first take input from three files containing names, address and phone number(u may not look at the entire code) just look at the bottom Now I give user to add contacts to add during runtime and these values are stored in a class. Now I erase the files containing names, address and numbers and write new data into them using ofstream which will be retrieved when user again runs the "phonebook" however i am not able to see any input into the files after program has run once and I added a few values during the runtime. Can someone help me? Thanks in advance <pre><code> #include<iostream>//Include Header Files #include<cstdlib> #include<fstream> #include<string> using namespace std; class contact{ public: string name;//ALL CLASS VARIABLES ARE PUBLIC int phonenumber; string address; contact(){//Constructor name= "Noname"; phonenumber= 0; address= "Noaddress"; } }; int main(){ contact *d; d= new contact[200]; string name,add; int choice,modchoice,k=0;//Variable for switch statement int phno,phno1; int i=0; int initsize=0, i1=0;//i is declared as a static int variable bool flag=false,flag_no_blank=false; //TAKE DATA FROM FILES..... //We create 3 files names, phone numbers, Address and then abstract the data from these files first! fstream f1; fstream f2; fstream f3; string file_input_name; string file_input_address; int file_input_number; f1.open("./names"); while(f1>>file_input_name){ d[i].name=file_input_name; i++; } initsize=i; f2.open("./numbers"); while(f2>>file_input_number){ d[i1].phonenumber=file_input_number; i1++; } i1=0; f3.open("./address"); while(f3>>file_input_address){ d[i1].address=file_input_address; i1++; } cout<<"\tWelcome to the phone Directory\n";//Welcome Message do{ //do-While Loop Starts cout<<"Select :\n1.Add New Contact\n2.Update Existing Contact\n3.Display All Contacts\n4.Search for a Contact\n5.Delete a Contact\n6.Exit PhoneBook\n\n\n";//Display all options cin>>choice;//Input Choice from user switch(choice){//Switch Loop Starts case 1:{ i++;//increment i so that values are now taken from the program and stored as different variables i1++; do{ cout<<"\nEnter The Name\n"; cin>>name; if(name==" "){cout<<"Blank Entries are not allowed"; flag_no_blank=true; } }while(flag_no_blank==true); flag_no_blank=false; d[i].name=name; cout<<"\nEnter the Phone Number\n"; cin>>phno; d[i1].phonenumber=phno; cout<<"\nEnter the address\n"; cin>>add; d[i1].address=add; i1++; i++; break;//Exit Case 1 to the main menu } case 2: { cout<<"\nEnter the name\n";//Here it is assumed that no two contacts can have same contact number or address but may have the same name. cin>>name; int k=0,val; cout<<"\n\nSearching.........\n\n"; for(int j=0;j<=i;j++){ if(d[j].name==name){ k++; cout<<k<<".\t"<<d[j].name<<"\t"<<d[j].phonenumber<<"\t"<<d[j].address<<"\n\n"; val=j; } } char ch; cout<<"\nTotal of "<<k<<" Entries were found....Do you wish to edit?\n"; string staticname; staticname=d[val].name; cin>>ch; if(ch=='y'|| ch=='Y'){ cout<<"Which entry do you wish to modify ?(enter the old telephone number)\n"; cin>>phno; for(int j=0;j<=i;j++){ if(d[j].phonenumber==phno && staticname==d[j].name){ cout<<"Do you wish to change the name?\n"; cin>>ch; if(ch=='y'||ch=='Y'){ cout<<"Enter new name\n"; cin>>name; d[j].name=name; } cout<<"Do you wish to change the number?\n"; cin>>ch; if(ch=='y'||ch=='Y'){ cout<<"Enter the new number\n"; cin>>phno1; d[j].phonenumber=phno1; } cout<<"Do you wish to change the address?\n"; cin>>ch; if(ch=='y'||ch=='Y'){ cout<<"Enter the new address\n"; cin>>add; d[j].address=add; } } } } break; } case 3 : { cout<<"\n\tContents of PhoneBook:\n\n\tNames\tNumbers\tAddresses\n"; for(int t=0;t<=i;t++){ if(d[t].name=="Noname") continue; cout<<".\t"<<d[t].name<<"\t"<<d[t].phonenumber<<"\t"<<d[t].address<<"\n"; } cout<<"\n\n\n\n"; break; } case 4:{ cout<<"Enter a name to search\n"; cin>>name; cout<<"\n\nSearching.........\n\n"; for(int j=0;j<=i;j++){ if(d[j].name==name){ k++; cout<<k<<".\t"<<d[j].name<<"\t"<<d[j].phonenumber<<"\t"<<d[j].address<<"\n\n"; int val=j; } } cout<<"\nA total of "<<k<<" contact names were found having the name"<<name; break; } case 6:{ cout<<"\n\nClosing the phonebook...Visit Again\n"; flag=true; break; } case 5: { cout<<"\nEnter the contact-name\n";//Here it is assumed that no two contacts can have same contact number or address but may have the same name. cin>>name; int k=0,val; cout<<"\n\nSearching.........\n\n"; for(int j=0;j<=i;j++){ if(d[j].name==name){ k++; cout<<k<<".\t"<<d[j].name<<"\t"<<d[j].phonenumber<<"\t"<<d[j].address<<"\n\n"; val=j; } } char ch; cout<<"\nTotal of "<<k<<" Entries were found....Do you wish to delete?\n"; if(k==0) break; string staticname; staticname=d[val].name; cin>>ch; if(ch=='y'|| ch=='Y'){ cout<<"Which entry do you wish to delete ?(enter the old telephone number)\n"; cin>>phno; for(int j=0;j<=i;j++){ if(d[j].phonenumber==phno && staticname==d[j].name){ val=j; } } for(int j=val;j<=i-1;j++){ d[j].name=d[j+1].name; d[j].phonenumber=d[j+1].phonenumber; d[j].address=d[j+1].address; } d[i].name="Noname"; d[i].phonenumber=0; d[i].address="Noaddress"; } break; } } } while(flag==false); std::ofstream f4("./names"); f4.close(); std::ofstream f5("./numbers"); f5.close(); std::ofstream f6("./address"); f6.close(); f1.close(); f2.close(); f3.close(); ofstream f7,f8,f9; f7.open("names"); f8.open("numbers"); f9.open("address"); int y=0; string w; w=d[0].name; while(f7<<w && y<=i){ if(w=="Noname") y++; continue; y++; w=d[y].name; } y=0; int v; v=d[0].phonenumber; while(f8<<v && y<=i){ if(v==0){y++; continue;} y++; v=d[y].phonenumber; } y=0; string u; u=d[0].address; while(f9<</pre>
Tags
<c++><file-handling>
Title
problem in writing to a file
singulars
PostAcceptedAnswerId
1. This table or related slice is empty.
PostParentId
1. This table or related slice is empty.
PostTypePostTypeId
1. PTQuestion
UserLastEditorUserId
1. USprolink007
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1. USFrustrated Coder
plurals
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1. This table or related slice is empty.
PostLinksRelatedPostIdPostId
1. This table or related slice is empty.
PostsAcceptedAnswerId
1. This table or related slice is empty.
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1. PO
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2. PO
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3. PO
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VotesPostIdCreationDate
1. VO
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 POproblem in writing to a file
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