Added bankers algorithm in c

bankers_algorithm.c

@@ -0,0 +1,115 @@
+#include <stdio.h>
+int main()
+{
+int Max[10][10], need[10][10], alloc[10][10], avail[10], completed[10], safeSequence[10];
+int p, r, i, j, process, count;
+count = 0;
+
+// read no of processes(p0,p1,p2,p3)
+printf("Enter the no of processes : ");
+scanf("%d", &p);
+
+//read no of resources (A,B,C,D)
+printf("\n\nEnter the no of resources : ");
+scanf("%d", &r);
+
+//read alloc (for p processes and r resources)
+printf("\n\nEnter the allocation for each process : ");
+for(i = 0; i < p; i++)
+{
+	printf("\nFor process %d : ",i + 1);
+	for(j = 0; j < r; j++)
+		scanf("%d", &alloc[i][j]);	
+}
+
+//read max (for p processes and r resources)
+printf("\n\nEnter the Max Matrix for each process : ");
+for(i = 0; i < p; i++)
+{
+	printf("\nFor process %d : ", i + 1);
+	for(j = 0; j < r; j++)
+		scanf("%d", &Max[i][j]);
+}
+
+//read avail (for p processes and r resources)
+printf("\n\nEnter the Available Resources : ");
+for(i = 0; i < r; i++)
+		scanf("%d", &avail[i]);	
+
+//calc need (for p processes and r resources)
+for(i = 0; i < p; i++)
+	for(j = 0; j < r; j++)
+		need[i][j] = Max[i][j] - alloc[i][j];
+
+// set all completed proccesses as 0
+for(i = 0; i< p; i++)
+	completed[i] = 0;
+
+// do while count !=process & process!=-1	
+do
+{
+	// process no i will be assigned to 'process' variable .So initialized as -1
+	process = -1;
+
+	// for each process p , if completion of p is 0 ,set process to i
+	for(i = 0; i < p; i++)
+	{
+		if(completed[i] == 0)
+		{
+			process = i ;
+
+			//for each resource r , if need > avail (process not selected),set process -1
+			for(j = 0; j < r; j++)
+			{
+
+				if(need[i][j] > avail[j])
+				{
+					process = -1;
+					break;
+				}
+			}
+		}
+		// break loop if selected (process!=-1)
+		if(process != -1)
+			break;
+	}
+
+	// if selected 
+	if(process != -1)
+	{
+		//print 'process +1 selected' (if p=3 ; i=0,1,2,3 ; if i = 2 selected ,3rd process is selected)
+		printf("\nProcess %d runs to completion!", process + 1);
+
+		// process stored to safe sequence matrix
+		safeSequence[count] = process + 1;
+		count++;
+
+		//for each resource r , 
+		for(j = 0; j < r; j++)
+		{
+			//new alloc = alloc +avail (not i but selected i which is 'process')
+			avail[j] += alloc[process][j];
+			// alloc & max = 0 ,completion of 'process' =1
+ 			alloc[process][j] = 0;
+			Max[process][j] = 0;
+			completed[process] = 1;
+		}
+	}
+}while(count != p && process != -1);
+
+// if all process selected ,ie count ==p
+if(count == p)
+{
+	// print safe state
+	printf("\nThe system is in a safe state!!\n");
+	// print safe sequence [i]
+	printf("Safe Sequence : < ");
+	for( i = 0; i < p; i++)
+		printf("%d  ", safeSequence[i]);
+	printf(">\n");
+}
+
+// else print unsafe
+else
+	printf("\nThe system is in an unsafe state!!");
+}