Page 189 - ARM Based Microcontroller Projects Using MBED

8.13 PROJECT 10—LOOP EXECUTION TIMES 175
/********************************************************************

MULTIPLICATION
==============
This program generates two random numbers between 1 and 100. The
product of these numbers is shown but the result is not shown, and
the user is given 20 seconds to calculate the result. After this
time the result is shown so that the user can check with his/her
own result.
Author: Dogan Ibrahim
Date : August 2018
File : Multiply
*********************************************************************/
#include "mbed.h"
Serial MyPC(USBTX, USBRX);

//
// Clear the screen
//
void clrscr()
{
char clrscr[] = {0x1B, '[', '2' , 'J',0};
MyPC.printf(clrscr);
}

//
// Home the cursor
//
void homescr()
{
char homescr[] = {0x1B, '[' , 'H' , 0};
MyPC.printf(homescr);
}

int main()
{
int Number1, Number2;

while(1)
{
clrscr(); // Clear the screen
homescr(); // Home the cursor
Number1 = rand() % 100 + 1; // First number
Number2 = rand() % 100 + 1; // Second number
MyPC.printf("\n\r%d X %d = ", Number1, Number2); // Display the product
wait(20.0); // Wait 20 seconds
MyPC.printf("%d\n", Number1 * Number2); // Display result
wait(5.0); // Wait 5 seconds
}
}
FIG. 8.35 Program listing.