So my program keeps crashing and I dont know why... please help

#include

#include "Alien.cpp$"$

using namespace std;

int main$()$

$\{$

string alien$[5]=\{"$Bolian$",$ "Ferengi", "Andorian", "Gorn", "Tholian"$\}$;

string planet$[]=\{"$Adelphous IV$",$"Rigel VII", "Camus II$",$ "Malon Prime", "Rigel V$",$ "Earth", "Venus", "Mars","Uranus"$\}$;

Alien aliens$[5]$;

for $($int i $=0$; i $<5$; i$++)\{$

aliens$[$i$].$Define$($alien$[$i$],$ planet$[$rand$()\%9],$ rand$()\%10,$ rand$()\%2)$;

$\}$

cout $<<"------------------------------------------"<<$ endl;

cout $<<"\backslash$tThe Federation Archives" $<<$ endl;

cout $<<"------------------------------------------"<<$ endl;

while $($true$)\{$

cout $<<"$

$[1]$ Display all aliens

$[2]$ Search by species

$[3]$ Search by planet

$[4]$ Exit

Enter your choice: $"$;

int choice $=0$;

string species;

string planet;

cin $>>$ choice;

switch $($choice$)\{$

case $1$:

for $($int i $=0$; i $<5$; i$++)\{$

aliens$[$i$].$DisplayInfo$()$;

$\}$

break;

case $2$:

cout $<<$ "Enter species: $"$;

cin $>>$ species;

for $($int i $=0$; i $<5$; i$++)\{$

if $($aliens$[$i$].$GetSpecies$()==$ species$)\{$

aliens$[$i$].$DisplayInfo$()$;

$\}$

else $\{$

cout $<<$ "The species $"<<$ species $<<"$ is unknown." $<<$ endl;

$\}$

$\}$

break;

case $3$:

cout $<<$ "Enter planet: $"$;

cin $>>$ planet;

for $($int i $=0$; i $<5$; i$++)\{$

if $($aliens$[$i$].$GetPlanet$()==$ planet$)\{$

aliens$[$i$].$DisplayInfo$()$;

$\}$

else $\{$

cout $<<"$No signs of life on planet $"<<$ planet $<<$ endl;

$\}$

$\}$

break;

case $4$:

cout $<<"$

Thank you for using The Federation Archives!";

false;

$\}$;

$\}$

$\}$#include

using namespace std;

class Alien $\{$

string mSpecies;

string mPlanet;

float mPopulation;

bool mHumanoid;

public:

Alien$()\{$

mSpecies $=""$;

mPlanet $=""$;

mPopulation $=0\mathrm{.}0$;

mHumanoid $=$ false;

$\}$

void Define$($string species, string planet, float pop, bool humanoid$)\{$

mSpecies $=$ species;

mPlanet $=$ planet;

mPopulation $=$ pop;

mHumanoid $=$ humanoid;

$\}$

string GetSpecies$()\{$

return mSpecies;

$\}$

string GetPlanet$()\{$

return mPlanet;

$\}$

float GetPopulation$()\{$

return mPopulation;

$\}$

bool IsHumanoid$()\{$

return mHumanoid;

$\}$

void DisplayInfo$()\{$

cout $<<"$

Species: $"<<$ mSpecies $<<"$

Planet: $"<<$ mPlanet $<<"$

Population: $"<<$ mPopulation $<<"$ billion

Humanoid: $"<<($mHumanoid $?$ "Yes" : $"$No$")<<"$

$"<<$ endl;

$\}$

$\}$;