Assignment to create CPU scheduler.

[phazawhy]

we have this requirement in school that we have to create a program that will able to solve the cpu scheduling (first come first serve, 1st job done and we need it to gant chart it). please teach me how to create a simple chart...


it suppose to be like:


Process ____________________Burst time________________ Arrival time
A _________________________ 5_______________________1
B _________________________ 6 ______________________ 2
C _________________________10 _____________________ 3



and that chart should be like:


___________0___5___6_____10_______________________ ______
A ] ___//////
B ] _______//////
C ] ___________ //////////


the faded will skip the previous time and should only be in the current time,
like in C, 6-10...... and i need it in C++
Please Help Thanks



and one more thing, im using do while statement w/ switch on it



its like

int main()
{
int j1, j2, j3, time, arrival;
char answer;
 
 
            /* Third Screen - CPU SCHEDULING ! */
 
do
    {
 
clrscr();
 
printf("\n\n\n                   Cpu Scheduling");
 
printf("\n\n                  First Come First Serve");
 
printf("\n\n\n\n\n           Enter the following 1st Burst time: ");
s("%d", &j1);
 
clrscr();
 
printf("\n\n\n                   Cpu Scheduling");
 
printf("\n\n                  First Come First Serve");
 
printf("\n\n\n\n\n           Enter the following 2nd Burst time: ");
s("%d", &j2);
 
clrscr();
 
printf("\n\n\n                   Cpu Scheduling");
 
printf("\n\n                  First Come First Serve");
 
printf("\n\n\n\n\n           Enter the following 3rd Burst time: ");
s("%d", &j3);
 
clrscr();
 
printf("\n\n\n                   Cpu Scheduling");
 
printf("\n\n                  First Come First Serve");
 
printf("\n\n\n\n\n           Enter the following Arrival time: ");
s("%d", &time);
 
 
 
printf("\n\n\n\n           Process        Burst Time         TimeArrival Time");
 
printf("\n\n             J01            %d                  %d ", j1,time);
 
printf("\n\n             J02            %d              %d ", j2,arrival=time+1);
 
printf("\n\n             J03            %d              %d ", j3,arrival=arrival+1);
 
p("\n\n\n\n\n\n        Response                    Gant Chart ");
 
p("\n\n\n        Do you want to try it again? [ Y / N ]: " );
s("%c", &answer);
 
}
while (answer == 'y' );
 
 
getche();
}

my prob are
1. i cant make it go back to DO when i enter y....
2. how can i make a chart
3. is it possible that it can accept small y and capital Y, how?
4. and how can i make not to accept other letters or special char rather than
y, Y, n and N...?


PLEASE HELP thanks

[gpraghuram]

we have this requirement in school that we have to create a program that will able to solve the cpu scheduling (first come first serve, 1st job done and we need it to gant chart it). please teach me how to create a simple chart...


it suppose to be like:


Process ____________________Burst time________________ Arrival time
A _________________________ 5_______________________1
B _________________________ 6 ______________________ 2
C _________________________10 _____________________ 3



and that chart should be like:


___________0___5___6_____10_______________________ ______
A ] ___//////
B ] _______//////
C ] ___________ //////////


the faded will skip the previous time and should only be in the current time,
like in C, 6-10...... and i need it in C++
Please Help Thanks



and one more thing, im using do while statement w/ switch on it



its like

int main()
{
int j1, j2, j3, time, arrival;
char answer;


/* Third Screen - CPU SCHEDULING ! */

do
{

clrscr();

printf("\n\n\n Cpu Scheduling");

printf("\n\n First Come First Serve");

printf("\n\n\n\n\n Enter the following 1st Burst time: ");
s("%d", &j1);

clrscr();

printf("\n\n\n Cpu Scheduling");

printf("\n\n First Come First Serve");

printf("\n\n\n\n\n Enter the following 2nd Burst time: ");
s("%d", &j2);

clrscr();

printf("\n\n\n Cpu Scheduling");

printf("\n\n First Come First Serve");

printf("\n\n\n\n\n Enter the following 3rd Burst time: ");
s("%d", &j3);

clrscr();

printf("\n\n\n Cpu Scheduling");

printf("\n\n First Come First Serve");

printf("\n\n\n\n\n Enter the following Arrival time: ");
s("%d", &time);



printf("\n\n\n\n Process Burst Time TimeArrival Time");

printf("\n\n J01 %d %d ", j1,time);

printf("\n\n J02 %d %d ", j2,arrival=time+1);

printf("\n\n J03 %d %d ", j3,arrival=arrival+1);

p("\n\n\n\n\n\n Response Gant Chart ");

p("\n\n\n Do you want to try it again? [ Y / N ]: " );
s("%c", &answer);

}
while (answer == 'y' );


getche();
}


my prob are
1. i cant make it go back to DO when i enter y....
2. how can i make a chart
3. is it possible that it can accept small y and capital Y, how?
4. and how can i make not to accept other letters or special char rather than
y, Y, n and N...?


PLEASE HELP thanks

1. i cant make it go back to DO when i enter y....
-->Put the do while loop ina while(1) loop and it is a infinite loop
2. how can i make a chart
-->I dont have idea about this
3. is it possible that it can accept small y and capital Y, how?
-->After getting the character convert it to an upper case character always and then check for 'Y' whichsolves the issue of checking for different combination.
4. and how can i make not to accept other letters or special char rather than
y, Y, n and N...?
-->You shuld have a logic in place for this and currently i am not getting an idea

Raghuram