Array Name Storage Program crashing after every input - c++

Question

Novice C++ user trying to make a program that uses arrays to store names. The output is a menu that you enter a command and it does said function. The problem is that when I attempt to enter a command from the menu, the program crashes. I don't get any errors or warnings when compiling so I'm at a loss for why it crashes.
Any feedback / help is greatly appreciated
#include <iostream>
#include <string>
using namespace std;
//Prototypes----------------------------------------------------------------------------------------------------------------------------------------------------------------
void addName (string nameList[], const int listMax); //Adds a name
void removeName (string nameList[], const int listMax); //Removes a name
void findName (string nameList[], const int listMax); // Searches for a name in the saved list
void showList (string nameList[], const int listMax); //Shows a list of names currentllistMax stored
void sortList (string nameList[], const int listMax); //Sorts saved names in alphabetical order
//Global Declartions--------------------------------------------------------------------------------------------------------------------------------------------------------
const int listMax = 50;
// MAIN FUNCTION -------------------------------------------------------------------------------------------------------------------------------------------------------------
int main(){
char input; // Variable for when the user inputs their menu selection
string nameList[listMax]; //string called names with the size being namesMax which is 50
cout << "Enter a Command " << endl; //Prompt to choose command from menu
cout << "<A> - Add a name to the database(Max 10)." << endl; //getNames
cout << "<R> - Remove a name from the database" << endl; //removeName
cout << "<F> - Search for a name in the database" << endl; //findName
cout << "<L> - Shows current state of list" << endl; //displalistMaxNames
cout << "<S> - Sorts the database." << endl; //sortNames
cout << "<Q> - Ends the program." << endl; //Exits the program entirellistMax
cin >> input; //Saves the menu choice input
if (input == 'A' ||input == 'a')
{
addName(nameList, listMax);
}
else if (input == 'R' || input == 'r')
{
removeName(nameList, listMax);
}
else if (input == 'F' || input == 'f')
{
findName(nameList, listMax);
}
else if (input == 'L' || input == 'l')
{
showList(nameList, listMax);
}
else if (input == 'S' || input == 's')
{
sortList(nameList, listMax);
}
else if (input == 'Q' || input == 'q')
{
return 0;
}
}
// ADD NAMES FUNCTION --------------------------------------------------------------------------------------------------------------------------------------------------------
void addName(string nameList[], const int listMax){
int x;
for (x = 0; x < listMax; x++) //x = 0 > if x is less than listMax, increment blistMax 1
{
cout << "Enter a name to be added to the database: ";
cin >> nameList[listMax];
}
return;
}
// REMOVE NAMES FUNCTION -----------------------------------------------------------------------------------------------------------------------------------------------------
void removeName(string nameList[], const int listMax){
string clearName; //EmptlistMax String
string removeName;
cout << "Enter the name to be removed from the database: ";
cin >> removeName; //The name entered saved to removeName for further computation
for (int x = 0; x < listMax; x++) // x = 0, if x is less than listMax; increment blistMax 1
{
if(nameList[x] == removeName) // Goes through everlistMax arralistMax level searching to see if it compares to the name saved to removeName
{
nameList[x] = clearName; // If name is found, assign value of clearnName, which is an emptlistMax string, thus removing it from the arralistMax.
}
else if(x == listMax - 1) // If it goes through the entire arralistMax and doesnt find a match it outputs that the name could not be found.
{
cout << "Name not found";
}
}
return;
}
// SEARCH FUNCTION -----------------------------------------------------------------------------------------------------------------------------------------------------------
void findName(string nameList[], const int listMax){
int x = 0;
int z;
bool f = false;
string searchName;
cout << "Enter a name to search for";
cin >> searchName;
while (!f && x <= listMax) //While f and x are equal to / less than listMax
{
int listMax = (x + z) / 2;
if (nameList[listMax] == searchName) // if our arralistMax is on level listMax then its on the list
{
f = true;
cout << nameList[listMax] << "is on the list!" <<endl;
}
else if (nameList[listMax] > searchName)
z = listMax - 1;
else
x = listMax + 1;
}
return;
}
// DISPLAY FUNCTION ----------------------------------------------------------------------------------------------------------------------------------------------------------
void showList(string nameList[], const int listMax){
cout << nameList[listMax];
return;
}
// SORT NAMES FUNCTION -------------------------------------------------------------------------------------------------------------------------------------------------------
void sortList(string nameList[], const int listMax){
bool sort;
do
{
sort = 0;
for (int x = 0; x < listMax - 1; x++)
{
if (nameList[x] > nameList[x + 1])
{
nameList[x].swap(nameList[x+1]);
sort = 1;
}
}
}
while (sort == 1);
return;
}

Answer 1

VisualStudio tells me the code crashes for accessing not-allocated memory.
You use list[listMax] several times, which shouldn't be and isn't OK.
The last item in an array a with length len is a[len-1], not a[len] (Because array indices start from 0 in C).
By the way, it also tells me that in findName() you use z while it's uninitialized, which is undefined behavior.