Add files via upload

library solidity.sol

@@ -0,0 +1,76 @@
+pragma solidity ^0.4.0;
+
+contract Library
+{
+    uint time;
+    uint validity;
+    uint fine;
+    uint f;
+    uint blc;
+
+      struct books{
+                 string bookname;
+                 string authorname;
+                 uint available;
+                 uint ISBN;
+                }
+              mapping(address=>books)book;
+     struct users{
+             string username;
+             uint id;
+                 }
+             mapping(address=>users)people;
+
+             function addbook(address _ass,string  bookname,string authorname)public
+             {
+                 book[_ass].bookname=bookname;
+                 book[_ass].authorname=authorname;
+             }
+
+
+             function susers(address _abb,string username,uint id)public
+             {
+                 people[_abb].username=username;
+                 people[_abb].id=id;
+             }
+
+             function getbook(address _add,string bookname,string authorname)public view returns(string)
+            {
+                book[_add].bookname=bookname;
+                book[_add].authorname=authorname;
+
+             }
+
+           function Booksearch(address ISBN)public returns(string)
+           {
+              if(book[ISBN].available>0)
+                {
+                    return("book is available");
+                }
+                else
+                {
+                    return("book is not available");
+                   }
+           }
+           function bookreturn(address ISBN)public{
+                book[ISBN].available++;
+                uint fine=1;
+                uint returntime=now;
+
+            if(returntime > validity) {
+            uint blc = returntime - validity;
+            blc=blc/60;
+            fine= blc * fine;
+            f =fine;
+        }
+      }
+      function penalty() public {
+                time=now;
+                validity = time + 2 * 1 minutes;
+        }  
+
+            function getfine() public view returns(uint) {
+            return(f);
+        }
+  }
+