added some more codes

Author: Lavin-tom

typedef/a.out enum/a.out

@@ -0,0 +1,9 @@
+//enum - Enumeration
+
+#include<stdio.h>
+int main()
+{
+	enum day {sun,mon,tue,wed=7,thu,fri,sat};
+	printf("%d\n",sun); //by default first value take 0 and next value is 0+1
+	printf("%d\n",thu);
+}

enum/basic_of_enum.c

@@ -0,0 +1,15 @@
+//enum example
+#include<stdio.h>
+int main()
+{
+	enum day {sun,mon,tue,wed,thu,fri,sat}d; //d is the enum variable
+
+	d=sun;
+	if(d==mon)
+		printf("working day\n");
+	else if(d==sat)
+		printf("Half working day\n");
+	else
+		printf("holiday\n");
+
+}

enum/day_enum.c

@@ -0,0 +1,34 @@
+//typedef with functions
+
+#include<stdio.h>
+typedef int calc(int,int);
+calc add,sub,mul,div;
+
+int main()
+	{
+		int a,b;
+		printf("enter the nos\n");
+		scanf("%d %d",&a,&b);
+
+		printf("sum :%d\n",add(a,b));
+		printf("dif :%d\n",sub(a,b));
+		printf("pro :%d\n",mul(a,b));
+		printf("div :%d\n",div(a,b));
+	}
+
+		int add (int a,int b)
+		{
+			return a+b;
+		}
+		int sub(int a,int b)
+		{
+			return a-b;
+		}
+		int mul(int a,int b)
+		{
+			return a*b;
+		}
+		int div(int a,int b)
+		{
+			return a/b;
+		}

typedef/typedef_functions.c

@@ -0,0 +1,16 @@
+// typedef with pointers
+
+#include<stdio.h>
+typedef int *pointer;
+typedef int integer;
+int main()
+	{
+	integer x=10,y=20;
+	pointer p,q; // equals to int *p,*q;
+	p=&x;
+	q=&y;
+	printf("%d %d\n",*p,*q);
+	*p=100;
+	*q=200;
+	printf("%d %d\n",*p,*q);
+	}

typedef/typedef_pointer.c

@@ -0,0 +1,14 @@
+//typedef with structure
+
+#include<stdio.h>
+typedef struct A
+{
+	int x;
+	int y;
+}st;  //st is not a structure variable. it is the alias name for structure A
+
+int main()
+{
+	st v={10,20};
+	printf("%d %d\n",v.x,v.y);
+}