Code

When the loop is supposed to be repeated the program endlessly does cin.get();s. Why is that?

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 #include <iostream>
#include <string>
using namespace std;

int i;
int z, x;
int k, l, r;

string a, dumb;

string plane[500];
int hop[500];
int mop[500];
int terminal[500];
int runway[500];

void menu();
void history();
void au();

void au() {
     z = 1;
     i = 0;
     cout << "This part of the A.T.C.P. allows you to put in the day's flight.\n The flights are then added to the history and this program also makes sure no \nplanes are going to to crash.\n When it asks for the flight you should type 'Flight111'.\n 111 being the flight number. When it is asking about the flight type 'Quit' to exit.\n Please restart the program every 500 planes.\n";
     while (z <= 500) {
           cout << "Flight?";
           getline(cin, plane[i]);
           if (plane[i] == "Quit.")
              menu();
           
x = 0;
while (x <= 499) {
      if (i << x) {
      plane[x] = "ahdrsdkjbnfciuwka"; }
if (i == x) {
x++;
}
if (plane[i] == plane[x]) {
cout << "Plane already logged.";
              cout << "Plane already registered. Closing.\n";
              menu();
}
              x++;}
cout << "Hour?";
cin >> hop[i];
cout << "Minutes?";
cin >> mop[i];
cout << "Terminal number?";
cin >> terminal[i];
cout << "Runway number?";
cin >> runway[i];
           
x = 0;
while (x <= 499) {
if (i == x) {
x++;
}
if (hop[i] == hop[x]) {
           
k = 0;
while (k <= 499) {
if (i == k) {
k++;
}
if (mop[i] == mop[k]) {
           
l = 0;
while (l <= 499) {
if (i == l) {
l++;
}
if (terminal[i] == terminal[l]) {
           
r = 0;
while (r <= 499) {
if (i == r) {
r++;
}
if (runway[i] == runway[r]) {
}
              }
cout << "Plane already for that time terminal and runway.\n\n";
}
              cout << "Closing.\n";
              menu();
              }

}
              }
              }
i++;
z++;
}
}
     cin.get();
     return;
}
int main() {
    i=0;
    menu();
    cin.get();
    cin.get();
    return 0;
}
void menu() {
    cout << "Welcome to the air traffic control program or A.T.C.P.. What would you like your A.T.C.P. do?\n You can view the history by typing 'History.' or edit incoming and landing \nflights by typing 'Active use.'\n\n";
    getline(cin, a);
    if (a == "History.") {
               history(); }
    if (a == "Active use.")
               au();
               while (a != "History." or "Active use.") {
                     cout << "\n Improper answer.\n";
                     getline(cin, a);
                      if (a == "History.") {
                         history(); }
                      if (a == "Active use.")
                         au();
                     }
}               
void history() {
               i = 0;
               while (i <= 100) {
                     if (i == 0) {
                           cout << "\nFlightNumber    Time    Terminal    Runway\n"; }
                     cout << plane[i]; 
                     cout << "       " << hop[i]; 
                     cout << ":" << mop[i]; 
                     cout << "    " << terminal[i]; 
                     cout << "       " << runway[i] << "\n";
                     i++;
                     }
    if (i == 101) {
         cout << "\nPress Enter to continue.\n";                 
    getline(cin, dumb); }
    while (i <= 200) {
                     if (i == 0) {
                           cout << "\nFlightNumber    Time    Terminal    Runway\n"; }
                     cout << plane[i]; 
                     cout << "       " << hop[i]; 
                     cout << ":" << mop[i]; 
                     cout << "    " << terminal[i]; 
                     cout << "       " << runway[i] << "\n";
                     i++;
                     }
    if (i == 201) {
         cout << "\nPress Enter to continue.\n";                 
    getline(cin, dumb); }
    while (i <= 300) {
                     if (i == 0) {
                           cout << "\nFlightNumber    Time    Terminal    Runway\n"; }
                     cout << plane[i]; 
                     cout << "       " << hop[i]; 
                     cout << ":" << mop[i]; 
                     cout << "    " << terminal[i]; 
                     cout << "       " << runway[i] << "\n";
                     i++;
                     }
    if (i == 301) {
         cout << "\nPress Enter to continue.\n";                 
    getline(cin, dumb); }
    while (i <= 400) {
                     if (i == 0) {
                           cout << "\nFlightNumber    Time    Terminal    Runway\n"; }
                     cout << plane[i]; 
                     cout << "       " << hop[i]; 
                     cout << ":" << mop[i]; 
                     cout << "    " << terminal[i]; 
                     cout << "       " << runway[i] << "\n";
                     i++;
                     }
    if (i == 401) {
         cout << "\nPress Enter to continue.\n";                 
    getline(cin, dumb); }
    while (i <= 499) {
                     if (i == 0) {
                           cout << "\nFlightNumber    Time    Terminal    Runway\n"; }
                     cout << plane[i]; 
                     cout << "       " << hop[i]; 
                     cout << ":" << mop[i]; 
                     cout << "    " << terminal[i]; 
                     cout << "       " << runway[i] << "\n";
                     i++;
                     }
               if (i == 500) {
                     cout << "History is finished.\n Returning to menu.\n";
                     }
    getline(cin, dumb);
    menu();
    cin.get();
    return;
}

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