Question

This program is to ask the user N number of math (using only +, -, *, and /) questions. Once the program start it asks the user to enter how many questions will be asked (N, which is between 3-10). Then, the program asks N questions to the user. Each question will be one of four math operations (+, -, *, and /). The operation and operands will be selected randomly in your program.Operand are “unsigned short” between 0 and 100. After N questions, program exits by showing success score (number of correct / number of all questions). See a sample run:

------Sample Run------

Enter number of questions I need to ask: 5

Q1) 3 + 4 = 6

Incorrect, 7 was the answer.

Q1) 8 – 4 = 4

Correct

Q1) 5 * 6= 30

Correct

Q1) 5 - 345= -300

Incorrect, it should be -340.

Q1) 0-0=0

Correct

Your success rate is 60%.

Answer 1

// C++ program to ask maths questions to user and calculate their success rate

#include <iostream>

#include <cstdlib>

#include <ctime>

using namespace std;

int main() {

       srand(time(NULL));

       unsigned short op1, op2;

       int result, userAns;

       int num_questions, correct_ans = 0;

       char opr[] = {'+','-','*','/'};

       // input of number of questions to ask

       cout<<"Enter number of questions I need to ask: ";

       cin>>num_questions;

       // validate number of question to be between [3,10] , re-prompt until valid

while(num_questions < 3 || num_questions > 10)

       {

             cout<<"Number of questions must be between [3,10]"<<endl;

             cout<<"Enter number of questions I need to ask: ";

             cin>>num_questions;

       }

       // loop to ask n number of questions

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

       {

             cout<<"Q"<<(i+1)<<") ";

             int oprIndex = rand()%4; // randomly generate the operator

             // randomly generate the operands 1 and operands 2

             op1 = rand()%101;

             op2 = rand()%101;

             // perform the operation based on the operator

             switch(opr[oprIndex])

             {

             case '+': // addition

                    result = op1+op2;

                    cout<<op1<<" + "<<op2<<" = ";

                    break;

             case '-': // subtraction

                    result = op1-op2;

                    cout<<op1<<" - "<<op2<<" = ";

                    break;

             case '*': // multiplication

                    result = op1*op2;

                    cout<<op1<<" * "<<op2<<" = ";

                    break;

             case '/': // division

                    // check if op2 = 0, loop to randomly generate value for op2 until we get a non-zero value for op2

                    while(op2 == 0)

                    {

                           op2 = rand()%101;

                    }

                    result = op1/op2;

                    cout<<op1<<" / "<<op2<<" = ";

                    break;

             }

             cin>>userAns; // input user answer

             // check if user answer is correct

             if(result == userAns)

             {

                    cout<<"Correct"<<endl;

                    correct_ans++; // increment correct answer count

             }else

                    cout<<"Incorrect, "<<result<<" was the answer"<<endl;

       }

       if(num_questions > 0)

       {

             // calculate and display the success rate

             int success_rate = (correct_ans*100)/num_questions;

             cout<<"Your success rate is "<<success_rate<<"%"<<endl;

       }

       return 0;

}

//end of program

Output: