diff --git a/week03/examples/for.cpp b/week03/examples/for.cpp
index 5c0e5cc..6de1279 100644
--- a/week03/examples/for.cpp
+++ b/week03/examples/for.cpp
@@ -2,13 +2,15 @@
 using namespace std;
 int main()
 {
-    int sum = 0;
-    for(int i = 0; i < 10; i++)
+    long long sum = 0;
+    long num;
+    cout<<"Enter any positive number: ";
+    cin>>num;
+    for(int i = 1; i <= num; i++)
     {
         sum += i;
-        cout << "Line " << i << endl;
     }
-    cout << "sum = "  << sum << endl;
+    cout << "sum of all numbers till "  <<num<<" is: "<< sum << endl;
 
     return 0;
 }
\ No newline at end of file
diff --git a/week03/examples/for.exe b/week03/examples/for.exe
new file mode 100644
index 0000000..b508237
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diff --git a/week03/examples/if.exe b/week03/examples/if.exe
new file mode 100644
index 0000000..b383c81
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diff --git a/week03/examples/ternary.cpp b/week03/examples/ternary.cpp
index 48b3094..04d298a 100644
--- a/week03/examples/ternary.cpp
+++ b/week03/examples/ternary.cpp
@@ -3,18 +3,17 @@ using namespace std;
 
 int main()
 {
-    bool isPositive = true;
-    int factor = 0;
-    //some operations may change isPositive's value
-    if(isPositive)
-        factor = 1;
-    else
-        factor = -1;
-    //the if-else statement can be replaced by a ternary conditional operation
-    factor = isPositive ? 1 : -1;
+    // to understand ternary operator
 
-    //sometimes the following code can be more efficient.
-    factor = isPositive * 2 - 1;
+    int a,b;
+    cout<<"This code will help you to understand ternary operator better."<<endl;
+    cout<<"Enter first number: ";
+    cin>>a;
+    cout<<"Enter second number: ";
+    cin>>b;
 
+    //ternary operator
+    int max = a>b?a:b;
+    cout<<"The greater number is: "<<max;
     return 0;
 }
\ No newline at end of file
diff --git a/week03/examples/ternary.exe b/week03/examples/ternary.exe
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index 0000000..c9f0f64
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diff --git a/week03/examples/while.cpp b/week03/examples/while.cpp
index f5aa8cb..a38364f 100644
--- a/week03/examples/while.cpp
+++ b/week03/examples/while.cpp
@@ -3,14 +3,15 @@ using namespace std;
 int main()
 {
     int num = 10;
-    while(num > 0)
+    while(num > 0) // when num gets 0 loop will break
     {
         cout << "num = " << num << endl;
         num--;
     }
-
+    // num gets 0 and priting it out of while loop
+    cout<<"num = "<<num;
     // num = 10;
-    // do
+    // do 
     // {
     //     cout << "num = " << num << endl;
     //     num--;
diff --git a/week03/examples/while.exe b/week03/examples/while.exe
new file mode 100644
index 0000000..49f4f1f
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diff --git a/week04/examples/array.cpp b/week04/examples/array.cpp
index 1056d8d..0591c39 100644
--- a/week04/examples/array.cpp
+++ b/week04/examples/array.cpp
@@ -2,7 +2,7 @@
 using namespace std;
 int main()
 {
-    int num_array1[5]; //uninitialized array, random values 
+    int num_array1[5]; // 5 is the size of the array and array is uninitialized it will give random values 
     int num_array2[5] = {0, 1, 2, 3, 4}; //initialization
 
     for(int idx = 0; idx < 5; idx++)
diff --git a/week04/examples/array.exe b/week04/examples/array.exe
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index 0000000..0e03b1f
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diff --git a/week04/examples/index-bound.cpp b/week04/examples/index-bound.cpp
index 7ff7b93..548f411 100644
--- a/week04/examples/index-bound.cpp
+++ b/week04/examples/index-bound.cpp
@@ -4,7 +4,7 @@ int main()
 {
     int num_array[5]; 
 
-    for(int idx = -1; idx <= 5; idx++) //out of bounds
+    for(int idx = -1; idx <= 5; idx++) //out of bounds <- -1 index does not exits and 5 also->
         num_array[idx] = idx * idx;
 
     for(int idx = -1; idx <= 5; idx++) //out of bounds
diff --git a/week04/examples/index-bound.exe b/week04/examples/index-bound.exe
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index 0000000..df6b3a4
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diff --git a/week04/examples/stdstring.exe b/week04/examples/stdstring.exe
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index 0000000..cfc3259
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