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/aa bcowebdav/pid-54576-dt-content-rid-241113, 1lcouses/CSO),1122 SPRING ProjectCt+ Spring2019.dc 2/6 Project Description Welcome to the Mathematics Proctice Software. s program will help you practice nth (+,-,りby resenting you with randonmly generated practice problems at different level of difficulty. The difficulty is determined by the nunber of digitsn he question. You can specify the initial unber of digits. The progran will also keep track of your progress. At the end of each session, you ay choose to continue or quit lease choose the openation you want to proctice today (+,J, or : lease enter the level of difficulty (1 and up): 1 iffialty Level1 very questio seconds to be

Answer 1

Code:

#include<iostream>
#include<cstdlib>
#include<time.h>
#include<math.h>
using namespace std;
int main()
{
   while(1)
   {
       cout<<"Please choose the operation you want to practice today (+,-,/, or *): ";
       char op;cin>>op;
       if(!(op=='+' || op=='-' || op=='/' || op=='*'))//if not a valid operator
       {
           cout<<"Invalid operator"<<endl;break;
       }
       cout<<"Please enter the level of difficult (1 and up): ";
       int dif;cin>>dif;
       srand(time(NULL));
       int min=pow(10,dif-1),max=pow(10,dif)-1;//generate two random numbers in the range min and max of digit size as dif
       int score=0;
       int i,j;
       for(i=0;i<5;i++)//5 operations
       {
           int val1=min + rand() % (( max + 1 ) - min);
           int val2=min + rand() % (( max + 1 ) - min);
           if(op=='/')//for division operator if second value is zero then repeatedly generate second number until it is not a zero
           {
               while(val2!=0)
               {
                   val2=min + rand() % (( max + 1 ) - min);
               }
           }
           int res,ans;//res stores user's answer, ans has correct answer
           for(j=0;j<3;j++)
           {
               cout<<"what is "<<val1<<" "<<op<<" "<<val2<<": ";
               if(op=='*')
               {
                   ans=val1*val2;
               }
               else if(op=='/')
               {
                   ans=val1/val2;
               }
               else if(op=='+')
               {
                   ans=val1+val2;
               }
               else if(op=='-')
               {
                   ans=val1-val2;
               }
               cin>>res;
               if(res==ans)
               {
                   cout<<"correct answer"<<endl;
                   score++;
                   break;
               }
               else
               {
                   cout<<"Incorrect!";
                   if(j==2) cout<<endl;//try for two more times
                   else cout<<" Try again"<<endl;
               }
           }
           cout<<"score: "<<score<<"/"<<i+1<<endl;//no of correct/total
       }
       string s;
       while(1)
       {
           cout<<"Enter continue or quit"<<endl;cin>>s;
           if(!(s=="continue" || s=="quit"))
           {
               cout<<"Inavlid choice, try again!"<<endl;
           }
           else
           {
               break;
           }
       }
       if(s=="quit") break;
   }
   return 0;
}

Output:

Please choose the operation you want to practice today (+,-,/, or *: + Please enter the level of difficult (1 and up) 2 what is 36 74: 110 correct answer score: 1/1 what is 86 33: 101 Incorrect! Try again what is 86 33: 102 Incorrect! Try again what is 86 33: 103 Incorrect! score: 1/2 what is 1266: 78 correct answer score: 2/3 what is 3539: 74 correct answer score: 3/4 what is 64 15: 79 correct answer score: 4/5 Enter continue or quit continue Please choose the operation you want to practice today (+,-,/, or *) Please enter the level of difficult (1 and up): 1 what is 2- 7:-5 correct answer score: 1/1 what is 5 9: -4 correct answer score: 2/2 what is 3- 2: 1 correct answer score: 3/3 what is 83: 5 correct answer score: 4/4 what is 13: -2 correct answer score: 5/5 Enter continue or quit Inavlid choice, try again! Enter continue or quit quit