LAB 8
Task 1

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Task 2

#include<stdio.h>
//#include<conio.h>

main(){

int i, j, k, n, so, tq, sob, sum, swt, stat, tata, temp, count; int bt[10], bth[10], wt[10], tat[10]; float awt=0.0, atat=0.0; char new;

printf("\n\n\n\n To start round robin scheduling press any key: ");

k = 0; new = getchar(); system("cls");

while(k < 7){

j = 0; sob = 0; count = 0; sum = 0; swt = 0; stat = 0; tata = 0;

printf("\n\n\n\t\t\t ROUND-ROBIN SCHEDULING"); printf("\n\t\t\t ======================"); printf("\n\n\n\n\n Enter number of processes: "); scanf("%d", &n); printf("\n");

for(i = 0; i < n; i++){

printf("\n Enter burst time for Process P%d: ", i+1); scanf("%d", &bt[i]); bth[i] = bt[i]; }

printf("\n\n Enter time quantum: "); scanf("%d", &tq); system("cls"); printf("\n\n\n\t\t\t ROUND-ROBIN SCHEDULING"); printf("\n\t\t\t ======================"); printf("\n\n\n\n\n Time quantum: %d", tq);

for(i = 0; i < n; i++){

if(bth[i] % tq == 0){

so = bth[i] / tq; } else{so = (bth[i] / tq) +1;} sob = sob + so; }

int gc[sob], gcps[sob];

while(1){

for(i = 0,count = 0; i < n; i++){

temp = tq; if(bth[i] == 0){

count++; continue; }

if(bth[i] > tq){

gc[j] = tq; gcps[j] = i+1; j++; bth[i] = bth[i] - tq; }

else if(bth[i] >= 0){

if(bth[i] == tq){gc[j] = tq; gcps[j] = i+1; j++;} else{gc[j] = bth[i]; gcps[j] = i+1; j++;} temp = bth[i]; bth[i] = 0; }

tata = tata + temp; tat[i ]= tata; }

if(n==count){

break; } }

for(i = 0; i < n; i++){

wt[i] = tat[i] - bt[i]; swt = swt + wt[i]; stat = stat + tat[i]; }

awt = (float)swt/n; atat = (float)stat/n;

printf("\n\n Process Burst time tot.timetaken tot.serve time\n"); printf(" ------- ---------- ------------ ----------------\n");

for(i = 0; i < n; i++){

printf("\n\n P%d\t %d\t %d \t %d", i+1, bt[i], wt[i], tat[i]); }

printf("\n\n\n\n Gantt Chart:\n"); printf(" ------------\n\n"); for(j = 0; j < sob; j++){

printf("\tP%d", gcps[j]); } printf("\n 0"); for(j = 0; j < sob; j++){

sum = sum + gc[j]; if(j == 0){printf(" %d", sum);} else{printf("\t %d", sum);} } printf("\n\n\n\n Average waiting time: %.2f \n\n Average turn around time: %.2f",awt,atat); printf("\n\n\n\n To start again press S and to exit press any key: ");

new = getchar(); system("cls");

if(new == 'S'|| new == 's'){k++;} else{printf("\n\n\n Program was terminated successfully\n\n Thank you\n\n\n"); break;}

}
}

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