queue

assignment6 (1).c

@@ -0,0 +1,112 @@
+#include<stdio.h>
+#define MAX 50
+struct queue{
+char id[50]
+}q[50];
+
+int h=-1,t=-1;
+void enqueue();
+void dequeue();
+void display();
+main()
+{
+
+	int choice;
+	char ans='y';
+	printf("1) Airplane lands.\n");
+	printf("2) Airplane takes off\n");
+	printf("3) Display\n");
+	printf("4) Exit\n\n");
+	while(ans!='n'&&ans!='N')
+	{
+
+		printf("Enter the choice:");
+		scanf("%d",&choice);
+		switch(choice)
+		{
+			case 1:
+				enqueue();
+				break;
+			case 2:
+				dequeue();
+				break;
+			case 3:
+				display();
+				break;
+			case 4:
+				return;
+			default:
+				printf("Enter the valid choice.");
+				break;
+		}
+		printf("\nDo you want to continue.? ");
+		scanf("%c",&ans);
+		scanf("%c",&ans);
+	}
+}
+
+
+
+void enqueue()
+{
+	if(t==MAX-1)
+	t=0;
+	else
+	t+=1;
+	if(h==t)
+	{
+		printf("Airport is full");
+		return;
+	}
+	printf("\nEnter the ID of plane:");
+	scanf("%s",q[t].id);
+	if(h==-1)
+	h=0;
+
+}
+
+
+void dequeue()
+{
+	if(t==-1)
+	{		
+		printf("\nNo such plan in Airport which can do take off.\n");
+		return;
+	}
+	else
+	{
+		printf("The plan with ID %s departured.",q[h].id);
+	}
+	if(h==t)
+	{
+		h=-1;
+		t=-1;
+		return;
+	}
+	else if(h==MAX-1)
+	h=0;
+	else
+	h+=1;
+}	
+
+
+void display()
+{
+   	int i;
+	if(h==-1)
+	printf("Airport is Empty.");
+	else
+	{	
+		for(i=h;i!=t+1;i++)
+		{
+			printf("%s\n",q[i].id);
+			if(i==MAX-1)
+			i=-1;
+		}
+	}
+}
+
+
+
+
+