I keep getting the following error and can't find what is wrong

Here is the code...

#include #include #include #include

using namespace std;

//head_to_val() method assigns an integer value to cards with different heads int head_to_val(char c) { if(c=='C') return 1; else if (c=='D') return 2; else if (c=='H') return 3; else if (c=='S') return 4; }

//tag_to_val() method assigns an integer value to card of every denomination with a head set int tag_to_val(char c) { if(c=='2') return 1; else if (c=='3') return 2; else if (c=='4') return 3; else if (c=='5') return 4; else if (c=='6') return 5; else if (c=='7') return 6; else if (c=='8') return 7; else if (c=='9') return 8; else if (c=='M') return 9; //I have used M for 10 else if (c=='J') return 10; else if (c=='Q') return 11; else if (c=='K') return 12; else if (c=='A') return 13; }

//cmp method compares between two cards bool cmp(string s1,string s2) { if(head_to_val(s1[0])==head_to_val(s2[0])) { return tag_to_val(s1[1])

class list { //listarr stores strings present in the list //dynamic array of size 20 string* listarr;

// n keeps count of total no. of elements in te listarr int n;

public: list() { n=0; // Part1 : To Create a list by dynamic allocated array and set the size to 20 listarr= new string[20];

// Initialize every string in list by a space" " for(int i=0;i

void PutItem(string s); void GetItem(string s); void DeleteItem(string s); void Display() { for(int i=0;i

continue;

}

cout

//PutItem() method insert string(card) s into sorted Poker cards list. void list::PutItem(string s) { if(listarr[0]==" ") { listarr[0]=s; } else { int i=0;

while(cmp(listarr[i],s) && listarr[i]!=" ") { i++; } if(listarr[i]==" ") { listarr[i]=s; } else { for(int j=18;j>=i;j--) listarr[j+1] = listarr[j];

listarr[i] = s; } }

n += 1; }

//DeleteItem() method deletes string(card) s into sorted Poker cards list. void list::DeleteItem(string s) { if(listarr[0]==" ") { return; } else { int i=0;

while(listarr[i]!=s && i

if(listarr[i] == s) { for(int j=i;j

n-=1; } else { cout

//GetItem() method finds string(card) s in the sorted Poker cards list.

void list::GetItem(string s) { if(listarr[0]==" ") { cout

while(listarr[i]!=s && i

if(listarr[i] == s) { cout

int main() { ifstream fobj; fobj.open("DataFile.txt"); int cnt = 0;

if(!fobj.good()) { cout

//Part2 : Read the first 20 cards in the first line of the file, the put them one by one into the list by using PutItem() int i = 0;

while( ss.good() && i

if(substr[1]=='1' && substr[2]=='0') { substr[1] = 'M'; substr[2] = '\0'; }

l.PutItem(substr); i++; }

l.Display();

//Part3 : delete the cards indicated in the second line of the file by using DeleteItem getline(fobj,str);

stringstream ss1(str);

i = 0;

while( ss1.good() && i

if(substr[1]=='1' && substr[2]=='0') { substr[1] = 'M';

substr[2] = '\0'; }

l.DeleteItem(substr); i++; }

l.Display();

//Part4 : put the items in the third line in to the list. Must use PutItem() getline(fobj,str); stringstream ss2(str);

i = 0;

while( ss2.good() && i

getline( ss2, substr, ',' );

if(substr[1]=='1' && substr[2]=='0') { substr[1] = 'M'; substr[2] = '\0'; }

l.PutItem(substr); i++;

}

l.Display(); //Part5 : Search the current list for the elements in the list getline(fobj,str);

stringstream ss3(str);

i = 0;

while( ss3.good() && i

l.GetItem(substr); i++; }

cout

return 0; }

Item D5 not present! Item HK not present! Item D2 not present! C2,C4,C8,?9 , CJ , CQ, D2,05,08,D10,DJ,00,DK , H3 , Hjhj , HK,57,SM terminate called after throwing an instance of std::logic_error what): basic_string::_M_construct null not valid This application has requested the Runtime to terminate it in an unusual way, Please contact the application's support team for more information