Commented the Whole code for better understanding

largest sum of subarray.cpp

@@ -1,31 +1,31 @@
-#include<bits/stdc++.h>
+#include<bits/stdc++.h>			//Including header file	
 using namespace std;
-int main(){
-	int n,el,i,j,max;
-	cout << "Enter size of array " << endl;
-	cin >> n;
-	int data[n];
-	cout << "Enter the elements " << endl;
-	for (i=0;i<n;i++){
-		cin >> el;
-		data[i] = el;
+int main(){				//Main Function
+	int n,el,i,j,max;				//Declaring variables
+	cout << "Enter size of array " << endl;		//getting the size of array
+	cin >> n;					// Storing that value in var n
+	int data[n];					//Defining an array of size n
+	cout << "Enter the elements " << endl;		
+	for (i=0;i<n;i++){				//
+		cin >> el;				// Getting all array value and storing it in the prev created array	
+		data[i] = el;				//
 	}
-	int ans[n];
-	ans[0] = data[0];
-	for (i=1;i<n;i++){
-		if (ans[i-1] + data[i] > data[i]){
-			ans[i] = data[i] + ans[i-1];
-		}
-		else{
-			ans[i] = data[i];
+	int ans[n];					//Creating a new array 'ans'	
+	ans[0] = data[0];				//First value of ans = First value in data
+	for (i=1;i<n;i++){				//Iterative Loop for n times
+		if (ans[i-1] + data[i] > data[i]){	//Condition check if value at 'ans' and corresponding next value in data sum is greater than data[i]
+			ans[i] = data[i] + ans[i-1];	//If so, that is the current max sub array sum	
+			}
+		else{	
+			ans[i] = data[i];		// Else value without adding is the max sub array sum
 		}
 	}
 	max = -100000;
 	for (i=0;i<n;i++){
 		if (max < ans[i]){
-			max = ans[i];
+			max = ans[i];		//Finding the ultimate max value from the above obtained values
 		}
 	}
-	cout << "Sum of largest subarray is " << max << endl;
+	cout << "Sum of largest subarray is " << max << endl;		// That would be the max sub array sum
 	return 0;
-}
+}