Question

For this project, you will create a program in C that will test the user’s proficiency at solving different types of math problems.   The program will be menu driven. The user will select either addition, subtraction, multiplication or division problems. The program will then display a problem, prompt the user for an answer and then check the answer displaying an appropriate message to the user whether their answer was correct or incorrect. The user will be allowed 3 tries at each problem. The program will also keep statistics on how many problems were answered correctly.

This week you will add functions to allow the user to select problems of varying degrees of difficulty and also keep statistics on number of correct answers vs. total number of problems attempted.

So now let’s add the code for the remaining functions:

We’ll start by inserting code to ask the user if they want to see problems that are easy, medium or difficult. We’ll do this by prompting them to enter ‘e’ for easy, ‘m’ for medium or ‘d’ for difficult and we’ll do this right after they have selected the type of problems they want. We will also add a validation loop that will check to see if they entered a correct response (e,m, or d).

Easy – problems using numbers 0 thru 10

Medium – problems 11 thru 100

Difficult – problems 100 – 1000

Here’s some code to get you started on the “difficulty level.”

if( difficultyLevel == 'E')

    {

                num1=rand()%10+1;

                 num2=rand()%10+1;

    }

   else

     if (difficultyLevel == 'M')

                {num1=rand()%100+1;

                 num2=rand()%100+1;

                }

   else

                 { num1=rand()%1000+1;

                 num2=rand()%1000+1;}           

Use an “if” statement to check the difficulty and generate the random numbers.

Statistics:

Create two variables ttlProblems and correctAnswers. Every time the user answers a problem add 1 to ttlProblems and every correct answer add 1 to correctAnswers. We’ll display the total number of problems and correct answers as well as the percent correct after the user has selected the exit option on the main menu.  

Then, alter the code to allow for floating point numbers. This requires formatting the output.

Answer 1

IDE Used: Dev C++

Code : mathquiz.c

#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h> //for bool datatype

//function to get difficulty level
char dif_lev_func()
{
   char dif_lev;
   printf("\nSelect question difficulty level\n");
   printf("e for easy, m for medium, d for difficult\n");
   printf("Your choice: ");
   dif_lev=getch();
   printf("%c",dif_lev);
   return dif_lev;
}

//function to perform operations
bool ques_func(char op)
{
   char dif_lev;
   float first_num;
   float sec_num;
   float ans;
  
   //for checking valid difficulty
   bool valid=false;
  
   //for counting number of turns
   int turn=0;
  
   //to check if answer is correct
   bool if_correct=false;
  
   //do this until difficulty is not valid
   do
   {
   dif_lev= dif_lev_func();
   if(dif_lev=='e')
   {
       first_num = rand()%10+1;
       sec_num = rand()%10+1;
       valid =true;
   }
   else if(dif_lev=='m')
   {
       first_num = rand()%100+1;
       sec_num = rand()%100+1;
       valid =true;
   }
   else if(dif_lev=='d')
   {
       first_num = rand()%1000+1;
       sec_num = rand()%1000+1;
       valid=true;
   }
   else
   {
  
       printf("\nInvalid option! Enter again: ");
       valid=false;
      
   }
}while(valid==false);
   if(op=='+')
   {
   //format to print two decimal point
       printf("\nQues: %0.2f + %0.2f",first_num,sec_num);
  
   while(turn<3)
   {
       printf("\nAnswer: ");
       scanf("%f",&ans);
   if(ans==(first_num+sec_num))
   {
       printf("\nCorrect Answer!");
       turn =3;
       if_correct=true;
}
else
{
printf("\nIncorrect Try again");
   turn++;
   if(turn==3)
{
   printf("\nTurn over!");
       }
       }
}
  
}
if(op=='-')
   {
   printf("\nQues: %0.2f - %0.2f",first_num,sec_num);
  
   while(turn<3)
   {
       printf("\nAnswer: ");
       scanf("%f",&ans);
   if(ans==(first_num-sec_num))
   {
       printf("\nCorrect Answer!");
       turn =3;
       if_correct=true;
}
else
{
printf("\nIncorrect Try again");
   turn++;
   if(turn==3)
{
   printf("\nTurn over!");
       }
       }
}
  
}
if(op=='*')
   {
   printf("\nQues: %0.2f * %0.2f",first_num,sec_num);
  
   while(turn<3)
   {
       printf("\nAnswer: ");
           scanf("%f",&ans);
   if(ans==(first_num*sec_num))
   {
       printf("\nCorrect Answer!");
       turn =3;
       if_correct=true;
}
else
{
   printf("\nIncorrect Try again");
           turn++;
           if(turn==3)
{
   printf("\nTurn over!");
       }
       }
}
  
}
if(op=='/')
   {
   printf("\nQues: %f / %f",first_num,sec_num);
     
   while(turn<3)
   {
       printf("\nAnswer: ");
       scanf("%f",&ans);
   if(ans==(first_num/sec_num))
   {
       printf("\nCorrect Answer!");
       turn =3;
       if_correct=true;
}
else
{
printf("\nIncorrect Try again");
   turn++;
   if(turn==3)
{
   printf("\nTurn over!");
       }
       }
}
  
}
return if_correct;
}

//main function
int main()
{
   int opt=0;
  
   //to print total questions answered
   int ttlproblems=0;
  
   //to print total correct answers
   int correctAnswers=0;
  
   bool if_correct=false;
   printf("Welcome to maths quiz\n");
  
   //continue this until option is 5 i.e Exit
   while(opt!=5)
   {
   printf("\nSelect your question type");
   printf("\n1. Addition\n2. Subtraction");
   printf("\n3. Multiplication \n4. Division");
   printf("\n5. Exit ");
   printf("\nChoice: ");
   scanf("%d",&opt);
   switch(opt)
   {
       case 1: if_correct=ques_func('+');
       ttlproblems++;
       if(if_correct==true)
       correctAnswers++;
       break;
       case 2: if_correct=ques_func('-');
       ttlproblems++;
       if(if_correct==true)
       correctAnswers++;
       break;      
       case 3: if_correct=ques_func('*');
       ttlproblems++;
       if(if_correct==true)
       correctAnswers++;
       break;   
       case 4: if_correct=ques_func('/');
       ttlproblems++;
       if(if_correct==true)
       correctAnswers++;
       break;
       case 5: printf("\nThanks for answering");
         
               //print total numbers of questions answered
               printf("\nTotal Question Answered: %d",ttlproblems);
         
               //print numbers of correct answered
               printf("\nTotal Correct Answers: %d",correctAnswers);
       break;      
}
}
   return 0;
}

Code Snippets

Sample Output