diff --git a/workshop/abstraction.sol b/workshop/abstraction.sol
new file mode 100644
index 0000000..80d04d3
--- /dev/null
+++ b/workshop/abstraction.sol
@@ -0,0 +1,8 @@
+pragma solidity >=0.4.0 <0.6.0;
+contract vehicle {
+    function noOfWheels() public view returns (uint);
+}
+
+contract Car is vehicle {
+    function noOfWheels() public view returns (uint){ return 4; }
+}
\ No newline at end of file
diff --git a/workshop/arraySample.sol b/workshop/arraySample.sol
new file mode 100644
index 0000000..08f96a1
--- /dev/null
+++ b/workshop/arraySample.sol
@@ -0,0 +1,122 @@
+pragma solidity ^0.5.0;
+pragma experimental "ABIEncoderV2";
+
+contract Arrays {
+
+    uint[3] fixedSimpleArr;  // fixed sized array
+    uint[] simpleDynamicArr; // dynamic array
+    uint[3][3] fixedSized;   // fixed sized 2D array
+    uint[][3] arrayDynamic;  // dynamic array with each element an array with 3
+    uint[3][] dynamicArray;  // fixed sized array with each element a dynamic
+    uint[][] dynamicArr;    // dynamic array with dynamic array elemnts.
+    uint[3][3][3] threeDArr;
+    constructor () public {
+      fixedSimpleArr = [1,2,3];
+      uint j;
+      for (uint i=0;i<3;i++){
+          j = i+1;
+          fixedSized[i] = [j*1, j*2, j*3];
+      }
+      uint[3] memory temp = [uint(1),2,3];
+      arrayDynamic[0] = new uint[](4);
+      arrayDynamic[1] = [1,2,3,4,5,6,7,8];
+      arrayDynamic[2] = temp;
+      dynamicArray = new uint[2][](3);
+      dynamicArray = [[1,2], [6,7], [9,0]];
+      threeDArr = [
+          [[1,2,3], [4,5,6], [7,8,9]],
+          [[10,11,12], [13,14,15], [16,17,18]],
+          [[19,20,21], [22,23,24], [25,26,27]]
+      ];
+    }
+
+    function setFixedSimpleArr(uint[3] memory simpleArr) public {
+      fixedSimpleArr = simpleArr;
+    }
+
+   // This function is illegal
+    function setSimpleDynamicArr(uint[] memory simpleArr) public {
+      simpleDynamicArr = simpleArr;
+    }
+
+    function setFixedSized(uint[3][3] memory inputArr) public {
+        fixedSized = inputArr;
+    }
+
+    function setDynamicArray(uint[3][] memory inputArr) public {
+        dynamicArray = inputArr;
+    }
+
+    // This function is illegal
+    function setArrayDynamic(uint[][3] memory inputArr) public {
+        arrayDynamic = inputArr;
+    }
+
+    // This function is illegal
+    function setDynamicArr(uint[][] memory inputArr) public {
+        dynamicArr = inputArr;
+    }
+
+    function setThreeDArr(uint[3][3][3] memory inputArr) public {
+        threeDArr = inputArr;
+    }
+
+    function getFixedSimpleArr() public view returns (uint[3] memory) {
+      return fixedSimpleArr;
+    }
+
+    function getSimpleDynamicArr() public view returns (uint[] memory) {
+      return simpleDynamicArr;
+    }
+
+    function getFixedSized() public view returns (uint[3][3] memory) {
+        return fixedSized;
+    }
+
+    function getDynamicArray() public view returns (uint[3][] memory) {
+        return dynamicArray;
+    }
+
+    // This function is illegal
+    function getArrayDynamic() public view returns (uint[][3] memory) {
+        return arrayDynamic;
+    }
+
+    // This function is illegal
+    function getDynamicArr() public view returns (uint[][] memory) {
+        return dynamicArr;
+    }
+
+    function getThreeDArr() public view returns (uint[3][3][3] memory) {
+        return threeDArr;
+    }
+
+    function getElementFixedSimpleArr(uint i) public view returns (uint) {
+      return fixedSimpleArr[i];
+    }
+
+    // This function is illegal
+    function getElementSimpleDynamicArr(uint i) public view returns (uint) {
+      return simpleDynamicArr[i];
+    }
+
+    function getElementFixedSized(uint i, uint j) public view returns (uint) {
+      return fixedSized[i][j];
+    }
+
+    function getElementDynamicArray(uint i, uint j) public view returns (uint) {
+      return dynamicArray[i][j];
+    }
+
+    function getElementArrayDynamic(uint i, uint j) public view returns (uint) {
+      return arrayDynamic[i][j];
+    }
+
+    function getElementDynamicArr(uint i, uint j) public view returns (uint) {
+      return dynamicArr[i][j];
+    }
+
+    function getElementThreeDArr(uint i, uint j, uint k) public view returns (uint) {
+        return threeDArr[i][j][k];
+    }
+}
diff --git a/workshop/assgnmnt.sol b/workshop/assgnmnt.sol
new file mode 100644
index 0000000..8c94db8
--- /dev/null
+++ b/workshop/assgnmnt.sol
@@ -0,0 +1,16 @@
+pragma solidity ^0.5.9;
+	contract C {
+		uint index;
+		function f() public pure returns (uint, bool, uint) {
+			return (7, true, 2);
+		}
+		function g() public returns(uint) {
+			(uint x, , uint y) = f();
+			(x, y) = (y, x);
+			(index, , ) = f(); // Sets the index to 7
+            return index;
+		}
+        function get() public view returns(uint) {
+            return index;
+        }
+	}
diff --git a/workshop/complex.sol b/workshop/complex.sol
new file mode 100644
index 0000000..36d6188
--- /dev/null
+++ b/workshop/complex.sol
@@ -0,0 +1,15 @@
+pragma solidity ^0.5.9;
+pragma experimental "ABIEncoderV2";
+contract complexSol {
+	struct cx {
+		int256 x;
+		int256 y;
+	}
+	cx result;
+	function complexAddition(cx memory a, cx memory b) public view returns(cx memory){
+		cx memory res;
+		res.x = a.x + b.x;
+		res.y = a.y + b.y;
+		return res;
+	}
+}
diff --git a/workshop/inherit.sol b/workshop/inherit.sol
new file mode 100644
index 0000000..dc6683a
--- /dev/null
+++ b/workshop/inherit.sol
@@ -0,0 +1,49 @@
+// pragma solidity >=0.4.0 <0.6.0;
+
+// contract C {
+//     uint private data;
+
+//     function f(uint a) public pure returns(uint b) { return a + 1; }
+//     function setData(uint a) public { data = a; }
+//     function getData() public view returns(uint) { return data; }
+//     function compute(uint a, uint b) external pure returns (uint) { return a + b; }
+// }
+
+// // This will not compile
+// contract D {
+//     function readData() public {
+//         C c = new C();
+//         uint local = c.f(7); // error: member `f` is not visible
+//         c.setData(3);
+//         local = c.getData();
+//         local = c.compute(3, 5); // error: member `compute` is not visible
+//     }
+// }
+
+
+
+// pragma solidity >=0.4.0 <0.6.0;
+
+// contract C {
+//     uint public data = 42;
+// }
+
+// contract Caller {
+//     C c = new C();
+//     function f() public view returns (uint) {
+//         return c.data();
+//     }
+// }
+
+
+
+
+// contract E is C {
+//     function g() public {
+//         C c = new C();
+//         uint val = compute(3, 5); // access to internal member (from derived to parent contract)
+//     }
+// }
+
+
+
diff --git a/workshop/reciept.sol b/workshop/reciept.sol
new file mode 100644
index 0000000..dd0e0cc
--- /dev/null
+++ b/workshop/reciept.sol
@@ -0,0 +1,18 @@
+pragma solidity >=0.4.21 <0.7.0;
+
+contract ClientReceipt {
+    event Deposit(
+        address indexed _from,
+        bytes32 indexed _id,
+        uint _value
+    );
+
+    function deposit(bytes32 _id) public payable {
+        // Events are emitted using `emit`, followed by
+        // the name of the event and the arguments
+        // (if any) in parentheses. Any such invocation
+        // (even deeply nested) can be detected from
+        // the JavaScript API by filtering for `Deposit`.
+        emit Deposit(msg.sender, _id, msg.value);
+    }
+}
\ No newline at end of file
diff --git a/workshop/string.sol b/workshop/string.sol
new file mode 100644
index 0000000..c5a18ea
--- /dev/null
+++ b/workshop/string.sol
@@ -0,0 +1,29 @@
+pragma solidity ^0.5.0;
+import "/Users/soumyanil jana/solidity-examples/workshop/stringUtils.sol";
+
+contract strTest {
+    using stringUtils for string;
+
+    function stringToUintt() public {
+        string memory unum = "1485517484864826648847788999984865484747564568484";
+        uint newNum = 1485517484864826648847788999984865484747564568484;
+        Assert.equal(unum.stringToUint(), newNum, "working");
+    }
+
+    function stringCompare() public {
+        string memory str_1 = "hello World";
+        string memory str_2 = "hello World";
+        Assert.ok(str_1.stringCompare(str_2), "working");
+    }
+
+    function stringLen() public {
+        string memory str = "hello World";
+        Assert.equal(str.stringLen(), 11, "working");
+    }
+
+    function stringConcat() public {
+        string memory str_1 = "hello ";
+        string memory str_2 = "World";
+        Assert.equal(str_1.stringConcat(str_2), "hello World", "working");
+    }
+}
\ No newline at end of file
diff --git a/workshop/stringUtils.sol b/workshop/stringUtils.sol
new file mode 100644
index 0000000..d9581cf
--- /dev/null
+++ b/workshop/stringUtils.sol
@@ -0,0 +1,63 @@
+// pragma solidity 0.5.9;
+// contract C {
+//     string s;
+//     function append(byte c) public {
+//         bytes(s).push(c);
+//     }
+
+//     function set(uint i, byte c) public {
+//         bytes(s)[i] = c;
+//     }
+//     function get() public view returns(string memory) {
+//         return s;
+//     }
+// }
+
+
+pragma solidity ^0.5.0;
+
+contract stringUtils {
+
+    function stringToUint(string memory str) public view returns(uint) {
+        bytes memory strBytes = bytes(str);
+        uint res = 0;
+        uint pow = 10;
+        bytes4 temp;
+        
+        for(uint i = 0; i < strBytes.length; i++) {
+            res *= pow;
+            temp = bytes4(strBytes[i]) >> 24;
+            res += uint32(temp)-48;
+        }
+        return res;
+    }
+
+    function stringCompare (string memory str1, string memory str2) public view returns (bool isSame) {
+      if(keccak256(bytes(str1)) == keccak256(bytes(str2))) {
+         isSame = true;
+      }
+   }
+
+   function stringLen(string memory str) public view returns (uint) {
+      return bytes(str).length;
+   }
+
+   function stringConcat(string memory str1, string memory str2) public view returns (string memory) {
+       bytes memory str_1 = bytes(str1);
+       bytes memory str_2 = bytes(str2);
+       bytes memory str_b = new bytes(str_1.length + str_2.length);
+       uint i = 0;
+       uint j = 0;
+       
+       while (i < str_1.length) {
+           str_b[j++] = str_1[i++];
+       }
+       
+       i=0;
+       
+       while (i < str_2.length) {
+           str_b[j++] = str_2[i++];
+       }
+       return string(str_b);
+   }
+}