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// SJF Scheduling Simulated using C. Code by Nived Kannada #include<stdio.h> void main() { int n, bt[20], at[20],p[20],wt[20],tat[20],i,j , total=0, pos, temp; float avgwt=0, avgtat=0; //Reading number of processes from input. printf("Enter number of processes: "); scanf("%d",&n); //Reading all burst times of processes from input. Assuming Arrival time is 0 for all. printf("Enter burst time of each process: \n"); for(i=0;i<n;i++) { p[i]=i; printf("Burst Time of P[%d]: ",i); scanf("%d",&bt[i]); at[i]=0; //Assuming AT is zero for all. } //Sorting Burst Time in its Ascending Order for(i=0;i<n;i++) { pos = i; for(j=i+1;j<n;j++) { if(bt[j]<bt[pos]) { pos=j; } } temp=bt[i]; bt[i]=bt[pos]; bt[pos]=temp; //Also sorting corresponding PID values. temp=p[i]; p[i]=p[pos]; p[pos]=temp; } //After this sorting step, the array bt[] is in ascending order. So the first element in the bt[] array doesn't have to wait. Its wt is now 0 /* CALCULATING WAITING TIME */ wt[0]=0; //The current first Process doesnt have to wait, (after sorting) //Setting wt values for all other processes. for(i=1;i<n;i++) //wt of 0 is set as 0. So we start with index 1 of wt[]. { wt[i]=0; //initialize wt of i'th index as 0 for(j=0;j<i;j++) { wt[i] = wt[i] + bt[j]; // adding waiting times of previous processes and the current burst time. } } /* CALCULATING TURNAROUND TIME */ for(i=0;i<n;i++) { tat[i] = wt[i] + bt[i]; //Equation for TAT is TAT= WT+BT } //Displaying Table printf("\n\tPID\tAT\tBT\tWT\tTAT\n"); for(i=0;i<n;i++) { printf("\t%d\t%d\t%d\t%d\t%d\n",p[i],at[i],bt[i],wt[i],tat[i]); } //Calculating Average Waiting time and Average Turnaround Time for(i=0;i<n;i++) { avgwt = avgwt + wt[i]; avgtat = avgtat + tat[i]; } avgwt = avgwt/n; avgtat = avgtat/n; //Displaying Average WT and Average TAT printf("\nAverage WT = %f\n", avgwt); printf("\nAverage TAT = %f\n", avgtat); } //END OF PROGRAM

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