LRU c++ program - c++

Question

I've been working on a program in one of my college classes. I have been having trouble with the implementation of my LRU code as it is not displaying any errors or anything, but compiles. There are two parts. The main that we input the values into, which we then specify which algorithm we want to use to find page faults. I know the main works, along with the FIFO algorithm, but I'm not getting anything with my LRU code (It compiles and "runs" but displays nothing as if I did not click to use the algorithm). Can anyone help me figure out what is wrong?
main.cpp
#include <iostream>
#include <string>
//#include "fifo.cpp"
#include "lru.cpp"
//#include "optimal.cpp"
using namespace std;
int main() {
// List of different variables
string pagestring;
int fs,pn[50], n;
// Prompt for page references
cout<<"Virtual Memory Simulation\nBy blah\n----------\nEnter the number of pages : " << endl;
cin >> n;
cout<<"\n-------------\nPlease enter a list of page numbers separated by commas.\n"<< endl;
cin>>pagestring;
// algorithm to use
char algo;
while (true) {
// Prompt algorithm to use
cout<<"----------\nPlease select an algorithm to use.\n\n1: First-In-First-Out (FIFO)\n2: Least-Recently-Used (LRU)\n3: Optimal\n0: Quit\n"<<endl;
cin>>algo;
if (algo == '1') {
//fifo(pagestring);
}
else if (algo == '2'){
LRU_Execute(pagestring, n);
}
else if (algo == '3'){
cout<<"Optimal Not yet coded"<<endl;
}
else if (algo == '0'){
break;
}
else {
cout<<"Invalid choice. Please try again."<<endl;
}
}
cout<<"Goodbye!!"<<endl;
};
LRU.cpp
#include <iostream>
#include <string>
using namespace std;
class pra
{
int fs,z;
int frame[50], frame1[50][2], pn[50], n, cnt, p, x;
public:
pra();
void init(string pagestring);
void getdata(string pagestring, int n);
void lru(int* pn, int n, string pagestring);
};
pra::pra()
{
int i;
for (i = 0; i < fs; i++)
{
frame[i] = -1;
}
for (i = 0; i < fs; i++)
{
frame1[i][0] = -1;
frame1[i][1] = 0;
}
p = 0;
cnt = 0;
}
void pra::init(string pagestring)
{
int i;
for (i = 0; i < fs; i++)
{
frame[i] = -1;
}
for (i = 0; i < fs; i++)
{
frame1[i][0] = -1;
frame1[i][1] = 0;
}
p = 0;
cnt = 0;
}
void pra::getdata(string pagestring, int n)
{
fs=3;
// index to loop through input string
int i = 0;
// current input string character
char z = pagestring[i];
int x = 0;
//cout << "\nEnter the page numbers : ";
while (z != '\0'){
// skip over commas and spaces
if (!(z == ',')) {
pn[x] = z;
x++;
// cout<<pn[x]<<"-This is pn[x]\n";
}
z = pagestring[++i];
}
//cout<<pn[x]<<"-This is pn[x] AGAIN\n";
this->lru(pn, n, pagestring);
}
void pra::lru(int* pn, int n, string pagestring)
{
init(pagestring);
int ind = 0, fault = 0, pi = 0, j, fn;
char i, z;
p = 0;
cnt = 0;
int min;
cout<<n<<"---"<<i<<" - "<<j<<" - "<<" - "<<fn<<" - "<<z;
for (i = 0; i < fs; i++)
{
frame1[i][0] = -1;
frame1[i][1] = 0;
}
pi = 0;
for (i = 0; i < n; i++)
{
j = 0;
if (ind > fs - 1)
ind = 0;
fault = 1;
min = 999;
while (j < fs)
{
if (frame1[j][0] = pn[pi])
{
fault = 0;
p++;
frame1[j][1] = p;
goto l2;
}
if (frame1[j][1] < min)
{
min = frame1[j][1];
fn = j;
}
j++;
}
j = 0;
while (j < fs)
{
if (frame1[j][0] = -1)
{
fault = 1;
fn = j;
goto l2;
}
j++;
}
ind++;
l2:
if (fault == 1)
{
p++;
frame1[fn][0] = pn[pi];
frame1[fn][1] = p;
cnt++;
}
cout << "\nElement: " << pn[pi];
pi++;
for (z = 0; z < fs; z++)
{
cout << "\t" << frame1[z][0];
}
if (fault == 1)
cout << "\t**Page Fault**";
else
cout << "\t--No Page Fault--";
}
cout << "\nTotal number of page faults: " << cnt;
cout << "\n";
}
void LRU_Execute(string pagestring, int n)
{
pra p;
int j, fault = 0, i, pi, z, fn, ind = 0, ans, ch;
p.getdata(pagestring, n);
//p.lru();
while (ans == 1);
//return 1;
}