C / C++ / MFC

#include <stdio>
#include <stdlib.h>


#define SENT 4 //"Quit" menu choice


/*  Function Prototypes */


	void DisplayMenu (void);
	int GetMenuChoice (void);
	void Gen2Rand (int*r1, int*r2);
	void DrillOneProb (int c, int r1, int r2);





/*============Mainline Procedures===============*/

int main (void)
{
	int	   c;   //Menu Choice (1-4)
	int   r1,  //First Random Integer:  2-12 inclusive
	      r2;  //Second Randon Integer:  2-12 inclusive

		  DisplayMenu();
		  c = GetMenuChoice();
	while (c >= 1 && c < SENT)
		 { Gen2Rand (&r1, &r2);
	  	  DrillOneProb (c, r1,r2);
		  DisplayMenu();
		  c = GetMenuChoice();
		  printf("Program Complete\n");}
		  return (0);
}



/*===========CHILD FUNCTIONS===============*/

/*  Display Title and Menu */

void DisplayMenu (void)

{
		printf("MENU OF OPERATIONS\n");
		printf("1. Addition.\n");
		printf("2. Subtraction.\n");
		printf("3. Multiplication.\n");
		printf("4. Quit.\n\n");


}

/* Get Menu Choice */

int GetMenuChoice (void)

	{
		int c;
		do{
			printf ("Enter the number of the operation to try (1-4):\n");
			scanf ("%d", &c);
		if  (c<1 || c>SENT)
				printf("\aInput value is out of range.\n");
		while (c < 1 || c > SENT);
		return (c);

	}

/* Generate and return 2 integers between 2-12 inclusive */


void Gen2Rand (int*r1p, int*r2p)

		int r1; //First random number
		int r2; //Second random number

		r1 = 2 + rand() % 11;
		r2 = 2 + rand() % 11;

	    *r1p = r1;
	    *r2p = r2;

return (0);


	}

/* Display two random numbers and ask user what the answer would be after the chosen operation*/

void DrillOneProb (int c, int r1, int r2)

{
		int CorAns, //Correct Answer
			Reply;  // Users Reply



	switch (c)
	{

			case 1:
		  	printf("+");
		   	CorAns = r1 + r2;
	                break;


			case 2:
		   	printf("-");
		  	CorAns = r1 - r2;
		  	break;


			default:
		        printf("x");
		        CorAns = r1 * r2;
		        break;

	}

	printf(" %d, ?", Reply);
	scanf ("%d", &Reply);

   if
  		(Reply == CorAns)

			   printf("Yes, that is correct. Good Job!");


		else
			{	printf("No, the correct answer is: %d", CorAns);
				printf("\n\n");
		    }