Question

Programming in C:

Write a program that will help an elementary school student learn multiplication. Use the random number generator to produce two positive integers between 1 and 12 inclusive. It should then type a question such as:

            How much is 6 times 7?

The student then types the answer. Your program checks the students’ answer. If it is correct, print a message such as Very good!   If the answer is wrong, print a message such as No. Please try again. Let the student try the same question again repeatedly until the student gets it right. After the student has answered correctly, ask if the student would like another question. If the student answers y for yes, the student is given another multiplication problem. If the student answers n for no, the program ends.

Use the following structure for your program:

• In function main seed the random number generator with the time of day. In a do while loop call a function named multiplication and then ask if the student wants another problem.
• In function multiplication generate two random numbers and have the student guess repeatedly until the student answers correctly. Call functions to generate appropriate messages for correct or incorrect answers. Function multiplication has a prototype like the following:

void multiplication (void);

• Function correctMessage generates different messages for correct answers. Use the random number generator to choose a number from 1 to 5 to select a response to each answer. Use a switch structure with printf statements to issue the responses. You may make up your own responses. Examples are:
  • Very good!
  • Excellent!
  • Nice work!
  • Keep up the good work!

Function correctMessage will have a prototype like the following:

void correctMessage(void);

• Function incorrectMessage generates different messages for incorrect answers. Use the random number generator to choose a number from 1 to 5 to select a response to each answer. Use a switch structure with printf statements to issue the responses. You may make up your own responses. Examples are:
  • No. Please try again.
  • Wrong. Try once more.
  • Don’t give up!
  • No. Keep trying.

Function incorrectMessage will have a prototype like the following:

            void incorrectMessage(void);

Answer 1

Program:

#include<stdio.h>
#include <time.h>

//function prototypes
void multiplication(void);
void correctMessage(void);
void incorrectMessage(void);

int main()
{
   //varaible declarations
   int repeat = 1;
   int x, y;
   int answer;
   char choice;
   //provide seed to the random number generator
   srand(time(NULL));
   //repeat the execution until the user wishes to exit
   do
   {
       //invoke the multiplication function
       multiplication();
       //prompt and read if the user wishes to repeat
       printf("Would you like to have another question (y/n)? ");
       scanf("%s", &choice);
       //if user entered n, then set repeat to 0 to terminate the loop
       if(choice == 'n' || choice == 'N')
           repeat = 0;
       //else set repeat to 1 to continue the loop
       else
           repeat = 1;
       printf("\n");
   }while(repeat == 1);
   printf("Good bye...");
   return 0;
}

//function that gives a multiplication question to the user and reads the answer
void multiplication(void)
{
   int x, y, msg;
   int isCorrect = -1;
   int upper = 12, lower = 1;
   int answer;
  
   //generate two random numbers between 1 and 12
   x = (rand() % (upper - lower + 1)) + lower;
   y = (rand() % (upper - lower + 1)) + lower;
   //repeat the loop until the user gives correct answer
   do
   {
       //ask the user a question
       printf("How much is %d times %d? ", x, y);  
       //read the answer
       scanf("%d", &answer);
       //if the answer is correct
       if(x * y == answer)
       {
           //print correct message
           correctMessage();
           printf("\n");
           isCorrect = 1;
       }
       //if the answer is incorrect
       else
       {
           //print incorrect message
           incorrectMessage();
           printf("\n");
       }
   }while(isCorrect == -1);
  
}

//function that print a message when user entered correct answer
void correctMessage(void)
{
   //generate a number between 1 and 5 and print a message
   int upper = 5, lower = 1;
   int msg = (rand() % (upper - lower + 1)) + lower;
   switch(msg)
   {
       case 1:
           printf("Very good!");
           break;
       case 2:
           printf("Excellent!");
           break;
       case 3:
           printf("Nice work!");
           break;
       case 4:
           printf("keep up the good work!");
           break;  
       case 5:
           printf("Good work!");
           break;
   }
}

//function that print a message when user entered incorrect answer
void incorrectMessage(void)
{
   //generate a number between 1 and 5 and print a message
   int upper = 5, lower = 1;
   int msg = (rand() % (upper - lower + 1)) + lower;
   switch(msg)
   {
       case 1:
           printf("No. Please try again.");
           break;
       case 2:
           printf("Wrong. Try once more.");
           break;
       case 3:
           printf("Don't give up!'");
           break;
       case 4:
           printf("No. Keep trying.");
           break;  
       case 5:
           printf("Better luck next time.");
           break;
   }  
}

Output:

Program Screenshot:

function that gives a multiplication question to the user and reads the answer void multiplication void) rit y msg int isCorrect- 1 nt upper- 12, lower-1 nt answer /generate two random numbers between 1 and 12 1" (and) % (upper-lower-1)-lower, ys (rand0 % (upper-1ower + 1))-lower, repeat the loop until the user gives comect answer ask the user a question print( "How much is %d times %d?", x, y); read the answer scant("%d", &answer); if the answer is correct if(x + y = answer) pint corect message correctMessage0 printf"n") isCorrect 1 ifthe answer is incorrect else pant incorrect message incomectMessage0 printf" n);

function that print a message when user entered correct answer void correctMessage(void) generate a number between 1 and 5 and print a message nt upper 5, lower-1 int msg (an40 96 (upper-lower + 1)) + lower. switchimsg) case 1: printfVery good!"); break case 2 break printf Nice work!" break case 4 printf keep up the good work! break case 3 printf Good work!

Let me know if you have any concerns with the above solution.