Question

Q3) Write a program to generate three random numbers between 1 and 9 and display them. The user has to enter their sum as soon as possible. These two steps will be repeated continuously. An alarm will be triggered every 5 seconds to display the numb answers so far. If the user did not give a correct answer in 10 seconds, the timer will jump to the main to give an error message "Too slow response!" and terminate the program. Moreover, the user may hit "Cntrl+z" to disable the timer (by blocking the signal) and take his time for the answer. Save your source code as "hw2q3.c" and include it in th Compile an Show the commands and the sample runs in the report. er of correct d run the program several times to show all features described in the question. 2I Page

in c

Answer 1

#include <unistd.h>

#include <poll.h>

#include <stdio.h>

#include <stdlib.h>

int main()

{

int total;

int randnumber()

{

int fnumber,snumber,tnumber;

fnumber = rand()%10;

snumber = rand()%10;

tnumber = rand()%10;

printf("First number: %d\nSecond Number: %d\nThird number%d\n", fnumber,snumber,tnumber);

printf("enter the total of 3 number in 10 seconds\n");

return fnumber+snumber+tnumber;

}

  

int answer=randnumber();

  

struct pollfd mypoll = { STDIN_FILENO, POLLIN|POLLPRI };

if( poll(&mypoll, 1, 10000) )

{

scanf("%d", &total);

if(total==answer){

printf("correct answer - %d\n", total);

}

else{

printf("you have entered incorrect answer, try again\n");

if( poll(&mypoll, 1, 5000) )

{

scanf("%d",&total);

if(total==answer){

printf("correct answer - %d\n", total);

}

else {

printf("You have tried two attempts and both got wrong.\ncorrect answer is %d",answer);

}

}

else{

printf("Too slow response\n");

}

}

}

else

{

printf("Too slow response\n");

}

return 0;

}

output:

cc version 4.6.3
   
First number: 3
Second Number: 6
Third number7
enter the total of 3 number in 10 seconds
 6
you have entered incorrect answer, try again
 16
correct answer - 16

output2

gcc version 4.6.3
   
First number: 3
Second Number: 6
Third number7
enter the total of 3 number in 10 seconds
Too slow response
 

output3:

gcc version 4.6.3
   
First number: 3
Second Number: 6
Third number7
enter the total of 3 number in 10 seconds
 16
correct answer - 16
 

output4:

First number: 3
Second Number: 6
Third number7
enter the total of 3 number in 10 seconds
 5
you have entered incorrect answer, try again
 5
You have tried two attempts and both got wrong.
correct answer is 16