Question

die's job is to output an error message alarmingly and terminate the program. You may copy my

function definition, or use your own:

// The following 4 lines should be present if we have a die function:

#include <iostream> // cout, endl

#include <string> // string

#include <cstdlib> // exit, EXIT_FAILURE

using namespace std;

bool die(const string & msg){

cout <<"Fatal error: " <<msg <<endl;

exit(EXIT_FAILURE);

}

4. Use rand to randomly choose one of the five operators * / % + - .

Use rand again to choose a random int in the range [1, 20].

Use rand again to choose a second random int in the range [1, 20].

Ask the user what the answer to the corresponding equation is.

C&d on input failure

Tell the user whether he's correct.

An example run of your program might go as

What's the answer to 14 * 3 ?

42

Yes, that's the right answer!

Answer 1

4>

C++ Code:

Output Snapshot:

Text Code:

#include <iostream>
using namespace std;

int main()
{
// Character Variable to store operatorSymbol
char operatorSymbol[6] = {'*','/','%','+','-'};
// Generating random number between 0 to 4 and storing it in operatorRandomNum
int operatorRandomNum = rand() % 5;
// Generating random number between 1 to 20 and storing it in firstRandomNum
int firstRandomNum = rand() % 20 + 1;
// Generating random number between 1 to 20 and storing it in secondRandomNum
int secondRandomNum = rand() % 20 + 1;
// Variable to store user input answer
int userInputResult;
// Prompting user to provide answer
cout << "What's the answer to " << firstRandomNum
<< " " << operatorSymbol[operatorRandomNum] << " " << secondRandomNum << "?" << endl;
// Storing user input in userInputResult variable
cin >> userInputResult;
  
// Variable to store actual calculated correct answer
int actualResult;
switch(operatorRandomNum){
case 0: // * Multiplication Operation
actualResult = firstRandomNum*secondRandomNum;
break;
case 1: // / Division Operation
actualResult = firstRandomNum/secondRandomNum;
break;
case 2: // % Modulo Operation
actualResult = firstRandomNum%secondRandomNum;
break;
case 3: // + Addition Operation
actualResult = firstRandomNum+secondRandomNum;
break;
case 4: // * Subtraction Operation
actualResult = firstRandomNum-secondRandomNum;
break;
}
  
// Displaying if user provided answer is correct or not
if(userInputResult == actualResult){
cout << "Yes, that's the right answer!";
} else {
cout << "No, that's the wrong answer!";
}
return 0;
}

Explanation:

• The program uses rand() function to generate random values. But the problem with rand() function is that, it generates the same value on every compilation and run.
• rand() % 20 generates the random value between range 0 to 19, and adding 1 to the expression (rand() % 20+1) results in generating a random value between 1 to 20.
• To generate different value values for every compilation and run process, please use srand() function instead of rand().
• Please replace the rand() by srand(time(NULL)) to generate a new random number for every compilation and run process. As srand() function uses Seed to generate the random number, In the seed, the time value is passed for seed, Hence it generates different random value with time whenever code is compiled and run.
• Please refer code comments for understanding purpose.