added pointer access

C/poniter_access.c

@@ -0,0 +1,19 @@
+//pointer access -  example
+
+#include<stdio.h>
+void main()
+{
+    int x, y;
+    int *ptr;
+    x = 10;
+    ptr = &x;
+    y = *ptr;
+    printf("Value of x is %d\n\n",x);
+    printf("x is stored at addr %u\n", &x);
+    printf("y is stored at addr %u\n", &y);
+    printf("value of y is: %d\n",y);
+    printf("pointer variable ptr contains the addr %u\n", ptr);
+    printf("pointer variable ptr itself is stored at addr %u\n", &ptr);
+    *ptr = 25;
+    printf("\nNow x has been assigned a new value through pointer which is= %d\n",x);
+}