creating a infinate loop
 

so this is what I have done

#include<iostream>



#include<string>

void menu();



using namespace std;

char choice;



void digcom ();



void matrices ();



int main ()



{ menu();







return 0;



}

void menu()

{

cout<<"\tMENU" <<endl<<"MATHEMATICS(matrices select A)\n"<<"DIGITAL COMMS select B\n"<<"c TO EXIT"<<endl;



cin>>choice;



while(choice!='c')

{



switch(choice)



{



case ('A') : matrices();break;



case ('B'): digcom();break;



default:cout<<"re-enter\n";

cin>>choice;break;



}

}

}// end of menu



void digcom()



{



 string ans;



 int *score;



 score=new int;  // dynamic memory allocation



 if(score==NULL)



 {



 cerr<<"insufitient space could not allocate memory"<<endl;



 exit(1);



 }



string questions[10]={"State the basic form of representation of a image","What does LAN stand for","What type of data transmission allows data to only flow in one direction","in a wireless network data is transmitted at the speed of __","which is___","determine the propagation delay associated with a connectionless communication channel through a private telephone network","What does modem stand for","what does IP stand for","what format is used to store data"};



string answers[10]={"pixels","Local Area Network","simplex","light,5*10^-8","5*10^-6","modulator-demodulator","Internet Protocol","digital format"};



string store[10];



cout<<"MAKE SURE THAT UR ANSWERS ARE IN SMALL LETTER UNLESS STATING THE ABBREVIATION"<<endl;



*score=0;



for(int n=0;n<9;n++)



{



cout<<questions[n]<<endl;



getline(cin,ans);



int f=ans.length();



store[n]=ans.substr(0,f);   // string function



}



for(int i=0;i<10;i++)



{



if(answers[i]==store[i])



{



*score++;  // pointer is incremented   possible use before definition



}



}



cout<<"you got "<<*score<<"/10"<<endl;



delete score;





menu();



} // end of this function







void matrices() // new function

{



int q1[4],q2[4],q3[4];

float da,dx,dy,dz,x,y,z,*ptr2;;

cout<<"\nTHE EQUATION MUST BE ENTERED USING CO-OEFICIENTS ONLY"<<endl

    <<"ENTER EQUATION 1"<<endl;

  for(int a=0;a<=3;a++)

    {

      cin>>q1[a];

    }



cout<<"\nEQUATION 1 COMPLETE, ENTER EQUATION 2"<<endl;



 for(int b=0;b<=3;b++)

   {

    cin>>q2[b];

   }



cout<<"\nEQUATION 2 COMPLETE, ENETR EQUATION3"<<endl;

 for(int c=0;c<=3;c++)

   {

    cin>>q3[c];

   }

int d,e,f,*pointer1;

// DET A

   pointer1=q1;

   d=*pointer1*((q2[1]*q3[2])-(q3[1]*q2[2]));

   pointer1++;

   e=*pointer1*((q2[0]*q3[2])-(q3[0]*q2[2]));

   pointer1++;

   f=*pointer1*((q2[0]*q3[1])-(q3[0]*q2[1]));

   pointer1++;

   da=d-e+f;



//DET X

   d=*pointer1*((q2[1]*q3[2])-(q3[1]*q2[2]));

   pointer1-=2;

   e=*pointer1*((q2[3]*q3[2])-(q3[3]*q2[2]));

   pointer1++;

   f=*pointer1*((q2[3]*q3[1])-(q3[3]*q2[1]));

   dx=d-e+f;



//DET Y

   pointer1=q1;

   d=*pointer1*((q2[3]*q3[2])-(q3[3]*q2[2]));

   pointer1+=3;

   e=*pointer1*((q2[0]*q3[2])-(q3[0]*q2[2]));

   pointer1--;

   f=*pointer1*((q2[0]*q3[3])-(q3[0]*q2[3]));

   dy=d-e+f;



//DET Z

   pointer1=q1;

   d=*pointer1*((q2[1]*q3[3])-(q3[1]*q2[3]));

   pointer1++;

   e=*pointer1*((q2[0]*q3[3])-(q3[0]*q2[3]));

   pointer1+=2;

   f=*pointer1*((q2[0]*q3[1])-(q3[0]*q2[1]));

   dz=d-e+f;





float t[3];

t[0]=dx/da;

t[1]=dy/da;

t[2]=dz/da;





cout<<"\n...........OPTIONS........."<<endl

    <<"1. CALCULATE THE VALUE OF X"<<endl

    <<"2. CALCULATE THE VALUE OF Y"<<endl

    <<"3. CALCULATE THE VALUE OF Z"<<endl

    <<"4. CALCULATE ALL THE VALUES"<<endl

    <<endl<<"ENTER YOUR CHOICE"<<endl;

cin>>d;



if(d==4)

 {

  ptr2=t;

  cout<<"THE VALUE OF X IS: "<<*ptr2<<endl;

  ptr2++;

  cout<<"THE VALUE OF Y IS: "<<*ptr2<<endl;

  ptr2++;

  cout<<"THE VALUE OF Z IS: "<<*ptr2<<endl;

 }



  else

   {

    cout<<"THE VALUE IS: "<<t[d-1]<<endl;

   }

menu();

}

theproblem is with the digcom after it has run it tells me of a error abou the pointer

Re: creating a infinate loop
 

What are you inputting for digcom?

Show us an exact example

void digcom()

{

  string ans;

  int *score;

  score = new int; // dynamic memory allocation



  if ( score == NULL )

  {

    cerr << "insufitient space could not allocate memory" << endl;

    exit ( 1 );

  }



  string questions[10] = {"State the basic form of representation of a image", "What does LAN stand for", "What type of data transmission allows data to only flow in one direction", "in a wireless network data is transmitted at the speed of __", "which is___", "determine the propagation delay associated with a connectionless communication channel through a private telephone network", "What does modem stand for", "what does IP stand for", "what format is used to store data"};

  string answers[10] = {"pixels", "Local Area Network", "simplex", "light,5*10^-8", "5*10^-6", "modulator-demodulator", "Internet Protocol", "digital format"};



  string store[10];



  cout << "MAKE SURE THAT UR ANSWERS ARE IN SMALL LETTER UNLESS STATING THE ABBREVIATION" << endl;



  *score = 0;



  for ( int n = 0; n < 9; n++ )

  {

    cout << questions[n] << endl;

    getline ( cin, ans );

    int f = ans.length();

    store[n] = ans.substr ( 0, f ); // string function

  }



  for ( int i = 0; i < 10; i++ )

  {

    if ( answers[i] == store[i] )

    {

      *score++; // pointer is incremented possible use before definition

    }

  }



  cout << "you got " << *score << "/10" << endl;



  delete score;

  menu();



} // end of this function

Plus you don't need a pointer to simply increment a score count. Hell you don't even need an array. The part in red doesn't make sense either.

Re: creating a infinate loop
 

Please take the time you need to get familiar with code tags