Thread: Help with Pseudo numbers

i have written a model program . though my actual program contains another set of questions(the questions i have used here are real easy.)
i have made use of srand and rand funtions
here is my code

Code:

#include<iostream>
#include<conio.h>
#include <cstdlib> 
#include <ctime> 

using namespace std;
main()
{
      srand((unsigned)time(0));
      int question,score=0;
      int option1,option2,option3,option4;
      for(int a=1;a<4;a++)
      {
              question=(rand()&#37;4)+1;
              if(question==1)
              {
              cout<<"What is 8+5 ";
              cin>>option1;
              if(option1==13)
              {
              score++;
              cout<<"Correct answer"<<endl;
              cout<<"Score ="<<score<<endl;
              }
              else
              {
                  score--;
                  cout<<"Bad answer"<<endl;
                  cout<<"Score ="<<score<<endl;
              }
              }
              
              if(question==2)
              {
              cout<<"What is 8+5"<<endl;
              cin>>option1;
              if(option1==13)
              {
              score++;
              cout<<"Correct answer"<<endl;
              cout<<"Score ="<<score<<endl;
              }
              else
              {
                  score--;
                  cout<<"Bad answer"<<endl;
                  cout<<"Score ="<<score<<endl;
              }
              }
              if(question==3)
              {
              cout<<"What is 8+4";
              cin>>option2;
              if(option2==12)
              {
              score++;
              cout<<"Correct answer"<<endl;
              cout<<"Score ="<<score<<endl;
              }
              else
              {
                  score--;
                  cout<<"Bad answer"<<endl;
                  cout<<"Score ="<<score<<endl;
              }
              }
              if(question==4)
              {
              cout<<"What is 8-5";
              cin>>option3;
              if(option3==3)
              {
              score++;
              cout<<"Correct answer"<<endl;
              cout<<"Score ="<<score<<endl;
              }
              else
              {
                  score--;
                  cout<<"Bad answer"<<endl;
                  cout<<"Score ="<<score<<endl;
              }
              }
              }
             getch();
              }

everything is working fine.the problem arises when a question repeats itself. what should i do to make sure a question is asked only once?

Instead of selecting a random question index on each iteration, put all possible question indices in an array. (Better yet, put data about the question and its answer in an array, instead of hard-coding each question.)
Then, start the program by shuffling the array and afterwards just step through it in order.
You can use std::random_shuffle for the shuffling.