Why can't I succesfully read file data to a struct array - c++

Question

I am writing a program based on the battleship board game for my C++ final, The problem I'm currently working on is how to manage user accounts. I have to allow users to use the same account every time they play and keep track of their win/loss record. I'm able to write the data to a file but I need to read it back in when a player logs back in and then sort it to find their user name. I'm stuck at this part.
this is a the file I'm using, its read as username,wins,losses:
Rocky 0 0
Bob 0 0
dave 0 0
Jerry 0 0
Bert 0 0
Ernie 0 0
Marcus 0 0
edit: this is the output I'm getting repeating many more times though
-858993460
-858993460
-858993460
-858993460
-858993460
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UserData is a struct
//begin create/find account function
userData createAccount(userData ud){
//local variables
int playerOption;
//creates object to open files
ifstream infile;
//creates object to open files
ofstream outfile;
do {
cout << "Do you have an existing account?" << endl;
cout << "" << endl;
cout << "Enter 1 for yes or 2 for no:" << endl;
cin >> playerOption;
}
while (playerOption >= 3 || playerOption <= 0);
if (playerOption == 1){
cout << "Enter user name:" << endl;
cin >> ud.name;
//opens file in read mode
infile.open("userData.dat");
//tests to make sure the file is open
if (!infile){
cout << "File open failure!";
}
//creates array of user data
userData userDataArray [SIZE];
//reads data from file into array until end of file
int i=0;
while(i<SIZE){
infile >> userDataArray[i].name;
infile >> userDataArray[i].wins;
infile >> userDataArray[i].losses;
i++;
}
///test output
int j=0;
while (j<SIZE){
cout << userDataArray[j].name << endl;
cout << userDataArray[j].wins << endl;
cout << userDataArray[j].losses << endl;
j++;
}
//end test output
//closes file
infile.close();
}
else if(playerOption == 2){
cout << "Enter user name:" << endl;
cin >> ud.name;
ud.wins = 0;
ud.losses = 0;
//opens file in write mode
outfile.open("userData.dat",ios::app);
//tests to make sure the file is open
if (!outfile){
cout << "File open failure!";
}
//writes userData struct to file
outfile << ud.name << " " << ud.wins << " " << ud.losses << endl;
//closes file
outfile.close();
}
return ud;
//end create/find account function
}

Answer 1

That is what a minimal example looks like, and it works perfectly:
#include <iostream>
#include <fstream>
using namespace std;
typedef struct { string name; int wins; int losses; } userData;
void createAccount(){
ifstream infile;
infile.open("userData.dat");
userData userDataArray[3];
for(int i = 0; i < 3; ++i){
infile >> userDataArray[i].name;
infile >> userDataArray[i].wins;
infile >> userDataArray[i].losses;
}
for(int i = 0; i < 3; ++i){
cout << userDataArray[i].name << endl;
cout << userDataArray[i].wins << endl;
cout << userDataArray[i].losses << endl;
}
}
int main(){
createAccount();
}
Output:
Rocky
0
0
Bob
0
0
dave
0
0
So you should simplify your code bit by bit, until it works. Or start from a simple code like mine and build your way up to achieve the functionality you need.
You initial question was "Why can't I succesfully read file data to a struct array", but apparently that is not the problem.
For a start, what is the value of SIZE ? If you say the output is very long, you might have set size to a value much higher than the number of serialized data in the file, and you are printing a lot of uninitialized data.