diff --git a/src/lab/exp1/simulation/numericalApproximation.js b/src/lab/exp1/simulation/numericalApproximation.js
index 5ca76384..4879c65c 100644
--- a/src/lab/exp1/simulation/numericalApproximation.js
+++ b/src/lab/exp1/simulation/numericalApproximation.js
@@ -294,6 +294,11 @@ window.view = {
 			alert('Integration Limits are from 0 to 30, b > a and b-a >= 1');
 			return false;
 		}
+		else if(Number(valueA1)>10 || valueA2<1 || Number(valueB1)<1 ||valueB2>10){
+			alert("invalid input");
+			return false;
+			}
+		
 		else {
 			model.inputValueA = valueA2;
 			model.inputValueB = valueB2;
diff --git a/src/lab/exp10/simulation/index.htm b/src/lab/exp10/simulation/index.htm
index 3e03797c..3242d532 100644
--- a/src/lab/exp10/simulation/index.htm
+++ b/src/lab/exp10/simulation/index.htm
@@ -38,6 +38,7 @@
 		        <button class = 'button editButton' id = 'buttonEdit' >Edit</button>
 		        <select class = 'button loopList' id = 'arithmaticExpressions' >
 		     		<option> a + b - c </option>
+		     		<option> a * (b + c) </option>
 		            <option> a + b / c </option>
 		            <option> ( a + b ) / c </option>
 		            <option> ( a + b ) * c - d </option>
@@ -77,4 +78,4 @@
 			</div><!-- end of resultDisplay -->
 		</div><!-- end of outputDivision -->
 	</body>
-</html>
\ No newline at end of file
+</html>
diff --git a/src/lab/exp2/simulation/function.js b/src/lab/exp2/simulation/function.js
index 9d494050..c5fe96b4 100644
--- a/src/lab/exp2/simulation/function.js
+++ b/src/lab/exp2/simulation/function.js
@@ -178,13 +178,13 @@ window.view = {
 			options4[i].checked = false
 		}
 		if ( a !== '2')
-			alert('Incorrect value of input variables(arguments). Calculating the area of a rectangle requires the length of the two different parallel sides of the rectangle. Try again.')
+			alert('Incorrect value of input variables(arguments). Calculating the area of a rectangle requires the length of adj side and opposite side.')
 		else if ( b !== 'float' )
-			alert('Incorrect datatype of input variables(arguments). The value of the sides of a rectangle need not be integers. Try again.')
+			alert('Incorrect datatype of input variables(arguments). The value of the sides of a triangle need not be integers. Try again.')
 		else if ( c !== 'float' )
-			alert('Incorrect datatype for return type. The value of the area of a rectangle need not be an integer. Try again.')
-		else if ( d !== 'a*b' )
-			alert('Incorrect formula for calculating the area of a rectangle. Try again.')
+			alert('Incorrect datatype for return type. The value of the area of a triangle need not be an integer. Try again.')
+		else if ( d !== '0.5*a*b' )
+			alert('Incorrect formula for calculating the area of a triangle. Try again.')
 		else
 			this.approveRectangleInputs()
 	},
@@ -268,7 +268,7 @@ window.view = {
 		document.getElementById('functionSquare').innerHTML += 'float area_sq (float a)<br>{<br> &emsp; float area = a*a;<br>&emsp; return area;<br>}'
 	},
 	displayFunctionForRectangle: function() {
-		document.getElementById('functionRectangle').innerHTML += 'float area_rect (float a,float b)<br>{<br> &emsp; float area = a*b;<br> &emsp; return area;<br>}'
+		document.getElementById('functionRectangle').innerHTML += 'float area_rect (float a,float b)<br>{<br> &emsp; float area = 0.5*a*b;<br> &emsp; return area;<br>}'
 	},
 	displayFunctionForTriangle: function() {
 		document.getElementById('functionTriangle').innerHTML += 'float area_triangle (float a)<br>{<br>&emsp;float area = (sqrt(3)/4.0)*a*a;<br>&emsp;return area;<br>}'
@@ -383,4 +383,4 @@ window.view = {
 	}
 }
 
-window.onload = function() { view.init() }
\ No newline at end of file
+window.onload = function() { view.init() }
diff --git a/src/lab/exp2/simulation/index.html b/src/lab/exp2/simulation/index.html
index 5732a2ea..21dc7d55 100644
--- a/src/lab/exp2/simulation/index.html
+++ b/src/lab/exp2/simulation/index.html
@@ -56,9 +56,9 @@
 			<div class="radioButtonHolder"><input type="radio" class="radiobutton" name="radio_group7" value="int"><label class="radioText">int</label></div>
 			<div class="radioButtonHolder"><input type="radio" class="radiobutton" name="radio_group7" value="float"><label class="radioText">float</label></div><!-- end of 3rd question -->		
 
-			<div class="questionTextRich">4. Choose formula for area of the rectangle :</div>
+			<div class="questionTextRich">4. Choose formula for area of the rightangle triangle :</div>
 			<div class="radioButtonHolder"><input type="radio" class="radiobutton" name="radio_group8" value="a*a"><label class="radioText">a*a</label></div>
-			<div class="radioButtonHolder"><input type="radio" class="radiobutton" name="radio_group8" value="a*b"><label class="radioText">a*b</label></div>
+			<div class="radioButtonHolder"><input type="radio" class="radiobutton" name="radio_group8" value="a*b"><label class="radioText">0.5*a*b</label></div>
 			<div class="radioButtonHolder"><input type="radio" class="radiobutton" name="radio_group8" value="2*&pi;*a"><label class="radioText">2*&pi;*a</label></div><!-- end of 4th question -->	
 
 			<button class="button okButton" id = 'okRectangle'>OK</button>	
@@ -119,7 +119,7 @@
 	<div class="executionDivisionTitle"><div class="executionPic"></div><div class="executionText">Step Execution</div></div>
 	<div class="stepExecutionDisplay" >
 		<div class="functionForSquare"><span class="textColor">//function for square</span><br><div id = 'functionSquare'></div></div>
-		<div class="functionForRectangle"><span class="textColor">//function for rectangle</span><br><div id = 'functionRectangle'></div></div>
+		<div class="functionForRectangle"><span class="textColor">//function for rightangle triangle</span><br><div id = 'functionRectangle'></div></div>
 		<div class="functionForTriangle"><span class="textColor">//function for triangle</span><br><div id = 'functionTriangle'></div></div>
 		<div class="functionForCircle"><span class="textColor">//function for circle</span><br><div  id = 'functionCircle'></div></div>
 	</div><!-- end of stepExecutionDisplay -->
diff --git a/src/lab/exp3/simulation/advControlFlow.js b/src/lab/exp3/simulation/advControlFlow.js
index 9f83de25..152d96d4 100644
--- a/src/lab/exp3/simulation/advControlFlow.js
+++ b/src/lab/exp3/simulation/advControlFlow.js
@@ -34,11 +34,14 @@ window.view = {
  	},
 	getInput: function() {
 		var inputValue = document.getElementById('simpleLoopInput').value
+		if(Number(inputValue)>=20){alert("invalid input");}
+		else{
 		model.inp = Number(inputValue)
-		this.clearExecutionSection()
+		this.clearExecutionSection()}
 	},
 	getNestedInput: function() {
 		var inputValue = document.getElementById('nestedLoopInput').value
+		
 		model.nestedInp = Number(inputValue)
 		this.clearExecutionSection()
 	},
@@ -377,4 +380,4 @@ window.view = {
 		this.activateEvents()
 	}
 }
-window.onload = function() { view.init() }
\ No newline at end of file
+window.onload = function() { view.init() }
diff --git a/src/lab/exp4/simulation/1-D/index.html b/src/lab/exp4/simulation/1-D/index.html
index a6a25b17..43c1b7fd 100644
--- a/src/lab/exp4/simulation/1-D/index.html
+++ b/src/lab/exp4/simulation/1-D/index.html
@@ -21,8 +21,8 @@
 		</div><!-- end of arraySizeInputBlock -->
 		<div class = 'radioButtonDivision hide' id = 'inputButtonRadio' >
             <div class = 'randomRadioButtonDivision' ><input type = 'radio' class = 'radiobutton' name = 'radio_group' id = 'btnRandom' ><label class = 'radioText' for = 'male' >Generate Random Values</label></div><!-- end of randomRadioButtonDivision -->
-            <div class = 'enterValueRadioButtonDivision' ><input type = 'radio' class = 'radiobutton' name = 'radio_group' id = 'btnManual'><label class = 'radioText' for = 'male' >Enter Values Manually</label></div><!-- end of enterValueRadioButtonDivision -->
-			<textarea class = 'arrayInputArea' name = 'firstname' placeholder = 'Enter values here in comma seperated format or seperated with space' id = 'userInput' ></textarea>
+            <div class = 'enterValueRadioButtonDivision' ><input type = 'radio' class = 'radiobutton' name = 'radio_group' id = 'btnManual'><label class = 'radioText' for = 'male' >Enter Values Manually</label><!-- end of enterValueRadioButtonDivision -->
+			<textarea class = 'arrayInputArea' name = 'firstname' placeholder = 'Enter values here in comma seperated format or seperated with space' id = 'userInput' ></textarea></div>
           	<div class = 'buttonHolder' ><button class = 'buttonDisable startButton' id = 'btnStart' disabled>Start</button><button class = 'buttonDisable nextButton' id = 'btnNext' disabled>Next</button></div><!-- end of buttonHolder -->
         </div><!-- end of radioButtonDivision -->
     </div><!-- end of inputDivisionBody -->
@@ -71,4 +71,4 @@
 	</div><!-- end of resultDisplay -->
 </div><!-- end of outputDivision -->
 </body>
-</html>
\ No newline at end of file
+</html>
diff --git a/src/lab/exp6/simulation/IfElse/basicControlFlow.js b/src/lab/exp6/simulation/IfElse/basicControlFlow.js
index 44d45ecc..e8a611a7 100644
--- a/src/lab/exp6/simulation/IfElse/basicControlFlow.js
+++ b/src/lab/exp6/simulation/IfElse/basicControlFlow.js
@@ -233,9 +233,9 @@ window.view = {
  		//this.getCanvas();
  		this.canvasContext.beginPath();
  		this.canvasContext.fillStyle = '#C2D995';
- 		this.canvasContext.fillRect (75, 75, 200, 250);
+ 		this.canvasContext.fillRect (50, 50, 200, 250);
  		this.canvasContext.strokeStyle = '#000000';
- 		this.canvasContext.rect(75, 75, 200, 250);
+ 		this.canvasContext.rect(50, 50, 200, 250);
  		this.canvasContext.stroke();	
  	},
  	// drawCircle: draws circle on canvasContext according given x and y coordinates.
@@ -262,10 +262,10 @@ window.view = {
     	displayFigures: function () {
     		this.drawDots();
     		this.drawFillRectangle();
-    		this.drawCircle(75, 75, '#000000');
-		this.drawCircle(275, 75, '#000000');
-		this.drawCircle(75, 325, '#000000');
-		this.drawCircle(275, 325, '#000000');
+    		this.drawCircle(50, 50, '#000000');
+		this.drawCircle(250, 50, '#000000');
+		this.drawCircle(250, 300, '#000000');
+		this.drawCircle(50, 300, '#000000');
 		this.displayText('(x1, y1)', 65, 65); 
 		this.displayText('(x2, y2)', 265, 65);
 		this.displayText('(x3, y3)', 265, 345);
@@ -355,7 +355,7 @@ window.view = {
 			if (this.nextSiblingElement.id === 'codeContentIfElse4Id' || this.nextOfnextSiblingElement.id === 'codeContentIfElse6Id') {
 				if (this.nextSiblingElement.id === 'codeContentIfElse4Id') 
 					this.codeExecutionWithColour();
-				else if (model.valueOfX >= 75) 
+				else if (model.valueOfX >= 50) 
 					this.changeFlagValue('flagValue1', 'codeContentIfElse6Id', '1');
 				else
 					this.codeExecutionWithColourAndId('codeContentIfElse8Id');
@@ -363,7 +363,7 @@ window.view = {
 			if (this.nextOfnextSiblingElement.id === 'codeContentIfElse8Id' || this.nextOfnextSiblingElement.id === 'codeContentIfElse10Id') {
 				if (this.nextOfnextSiblingElement.id === 'codeContentIfElse8Id') 
 					this.codeExecutionWithColourAndId('codeContentIfElse8Id');
-				else if (model.valueOfX <= 275) 
+				else if (model.valueOfX <= 250) 
 					this.changeFlagValue('flagValue2', 'codeContentIfElse10Id', '1');
 				else
 					this.codeExecutionWithColourAndId('codeContentIfElse12Id');
@@ -371,7 +371,7 @@ window.view = {
 			if (this.nextOfnextSiblingElement.id === 'codeContentIfElse12Id' || this.nextOfnextSiblingElement.id === 'codeContentIfElse14Id') {
 				if (this.nextOfnextSiblingElement.id === 'codeContentIfElse12Id') 
 					this.codeExecutionWithColourAndId('codeContentIfElse12Id');
-				else if (model.valueOfY >= 75) 
+				else if (model.valueOfY >= 50) 
 					this.changeFlagValue('flagValue3', 'codeContentIfElse14Id', '1');
 				else
 					this.codeExecutionWithColourAndId('codeContentIfElse16Id');
@@ -379,7 +379,7 @@ window.view = {
 			if (this.nextOfnextSiblingElement.id === 'codeContentIfElse16Id' || this.nextOfnextSiblingElement.id === 'codeContentIfElse18Id') {
 				if (this.nextOfnextSiblingElement.id === 'codeContentIfElse16Id')
 					this.codeExecutionWithColourAndId('codeContentIfElse16Id');
-				else if (model.valueOfY <= 325) 
+				else if (model.valueOfY <= 300) 
 					this.changeFlagValue('flagValue4', 'codeContentIfElse18Id', '1');
 				else
 					this.codeExecutionWithColourAndId('codeContentIfElse20Id');
@@ -387,7 +387,7 @@ window.view = {
 			if (this.nextOfnextSiblingElement.id === 'codeContentIfElse20Id' || this.nextOfnextSiblingElement.id === 'codeContentIfElse22Id') {
 				if (this.nextOfnextSiblingElement.id === 'codeContentIfElse20Id') 
 					this.codeExecutionWithColourAndId('codeContentIfElse20Id');
-				else if (model.valueOfX > 75 && model.valueOfX < 275 && model.valueOfY > 75 && model.valueOfY < 325) {
+				else if (model.valueOfX > 50 && model.valueOfX < 250 && model.valueOfY > 50 && model.valueOfY < 300) {
 					this.codeExecutionWithColourAndId('codeContentIfElse22Id');
 					this.displayTextWithColour('Output: INSIDE', 100, 40, '#FF2400');
 				}
diff --git a/src/lab/exp6/simulation/IfElse/index.html b/src/lab/exp6/simulation/IfElse/index.html
index 46080f90..474ccbaa 100644
--- a/src/lab/exp6/simulation/IfElse/index.html
+++ b/src/lab/exp6/simulation/IfElse/index.html
@@ -14,10 +14,10 @@
 <div class = 'inputDivision' >
 	<div class = 'inputDivisionTitle' ><div class = 'initializePic' ></div><div class = 'initializeText' >Initialize</div></div>
 	<div class = 'inputDivisionBody' >
-		<div class = 'instructionText marginTop' > x1 = 075; &nbsp; y1 = 075;</div>
-		<div class = 'instructionText' > x2 = 275; &nbsp; y2 = 075;</div>
-		<div class = 'instructionText' > x3 = 275; &nbsp; y3 = 325;</div>
-		<div class = 'instructionText' > x4 = 075; &nbsp; y4 = 325;</div>
+		<div class = 'instructionText marginTop' > x1 = 050; &nbsp; y1 = 050;</div>
+		<div class = 'instructionText' > x2 = 250; &nbsp; y2 = 050;</div>
+		<div class = 'instructionText' > x3 = 250; &nbsp; y3 = 300;</div>
+		<div class = 'instructionText' > x4 = 050; &nbsp; y4 = 300;</div>
 		<div class = 'DayInputText' ><label class = 'dText' >X : </label><input value = '150' class = 'textField' type = 'text'  id = 'textFieldXId' ></div>
 		<div class = 'DayInputText' ><label class = 'dText'>Y : </label><input value = '150' class = 'textField' type = 'text'  id = 'textFieldYId' ></div>
         <div class = 'listDivision margin15' >
@@ -125,4 +125,4 @@
 	</div>
 </div>
 </body>
-</html>
\ No newline at end of file
+</html>
diff --git a/src/lab/exp6/simulation/SwitchCase/basicControlFlow.js b/src/lab/exp6/simulation/SwitchCase/basicControlFlow.js
index 6822a81c..a8aed54f 100644
--- a/src/lab/exp6/simulation/SwitchCase/basicControlFlow.js
+++ b/src/lab/exp6/simulation/SwitchCase/basicControlFlow.js
@@ -221,8 +221,8 @@ window.view = {
 			this.codeExecutionWithColour();
 	 	if (this.currentSiblingElement.className === 'break redClass')
 			this.codeExecutionWithColourAndId('closeBrc1Id');
-		if (1 <= model.inputNumber && model.inputNumber <= 6) {
-	 		if (this.nextSiblingElement.id === 'holidayId')
+		if (1 <= model.inputNumber && model.inputNumber <= 5) {
+	 		if (this.nextSiblingElement.id === 'holidayId' )
 				this.codeExecutionWithColourAndId('elseIfId');
 	 		else if (this.nextSiblingElement.id === 'workingdayId') {
 	 			this.codeExecutionWithColour();
@@ -230,9 +230,10 @@ window.view = {
 				this.setInnerHtml('outputDayId', 'WORKING DAY');
 	 		}
 	 	}
-		if ( model.inputNumber > 7 ) {
+		if ( model.inputNumber > 7 ||model.inputNumber <=0 ) {
 	 		if (this.nextSiblingElement.id === 'holidayId')
 				this.codeExecutionWithColourAndId('elseIfId');
+			
 	 		else if (this.nextSiblingElement.id === 'workingdayId') 
 				this.codeExecutionWithColourAndId('elseId');
 	 		else if (this.nextSiblingElement.id === 'invalidIPId') {
@@ -240,7 +241,9 @@ window.view = {
 				this.setInnerHtml('outputDayId', 'INVALID INPUT');
 	 		}
 	 	}
-	 	if (model.inputNumber === 7) {
+	 	
+		
+	 	if (model.inputNumber === 7 || model.inputNumber === 6) {
 	 		if (this.nextSiblingElement.id === 'holidayId') {
 				this.codeExecutionWithColour();
 				this.changeOpacity('holidayImage');
diff --git a/src/lab/exp6/simulation/SwitchCase/index.html b/src/lab/exp6/simulation/SwitchCase/index.html
index 4af5361f..0e337bc0 100644
--- a/src/lab/exp6/simulation/SwitchCase/index.html
+++ b/src/lab/exp6/simulation/SwitchCase/index.html
@@ -88,4 +88,4 @@
 	</div>
 </div>
 </body>
-</html>
\ No newline at end of file
+</html>
diff --git a/src/lab/exp9/simulation/JS/recursion.js b/src/lab/exp9/simulation/JS/recursion.js
index 1417a55b..0189feb6 100644
--- a/src/lab/exp9/simulation/JS/recursion.js
+++ b/src/lab/exp9/simulation/JS/recursion.js
@@ -23,8 +23,8 @@ window.view = {
 		 	alert('Enter number of disks first !')
 		 else if ( isNaN(input) === true )
 			alert('Number of disks must be an integer value !')
-		 else if ( input > 5 || input % 1 !== 0 )
-			alert('Only integral value (Greater than equal to 1 and less than equal to 5) is accepted !')
+		 else if ( input > 10 || input % 1 !== 0 )
+			alert('invalid input')
 		 else {
 			this.disableElement('btnOk')
 			this.enableElement('btnStart')
@@ -290,4 +290,4 @@ window.view = {
 		this.activateEvents()
 	}
 }
-window.onload = function() { view.init() }																										
\ No newline at end of file
+window.onload = function() { view.init() }