From 7b549a57bd2eb73f462a1fc7351379698ba12db4 Mon Sep 17 00:00:00 2001
From: Michael Neumann <devel@bogenmichel.de>
Date: Sat, 12 Aug 2023 19:45:17 +0200
Subject: [PATCH] Close #3 return value

add return value for main function.
add return 0 for normal exit.
---
 CPP001_First_Program.cpp                                      | 4 +++-
 CPP002_Variables.cpp                                          | 4 +++-
 CPP003_Variables_Types.cpp                                    | 3 ++-
 CPP004_Input.cpp                                              | 3 ++-
 ...05_Arithmetic_Assignment_Increment_Decrement_Operators.cpp | 3 ++-
 CPP006_Relational_Operators.cpp                               | 4 +++-
 CPP007_Logical_Operators.cpp                                  | 3 ++-
 CPP008_Calculator_Exercise.cpp                                | 4 +++-
 CPP009_Arrays.cpp                                             | 4 +++-
 CPP010_Multidimensional_Arrays.cpp                            | 4 +++-
 CPP011_For.cpp                                                | 4 +++-
 CPP012_While_DoWhile.cpp                                      | 4 +++-
 CPP013_Counting_Digits_Exercise.cpp                           | 4 +++-
 CPP014_Nested_Loops.cpp                                       | 4 +++-
 CPP015_Break_Continue.cpp                                     | 4 +++-
 CPP016_Variables_Scope.cpp                                    | 3 ++-
 16 files changed, 43 insertions(+), 16 deletions(-)

diff --git a/CPP001_First_Program.cpp b/CPP001_First_Program.cpp
index e7b7da9..851573e 100644
--- a/CPP001_First_Program.cpp
+++ b/CPP001_First_Program.cpp
@@ -1,7 +1,9 @@
 #include<iostream>
 using namespace std;
 
-main()
+int main()
 {
     cout<<"Hello World !";
+    
+    return 0;
 }
diff --git a/CPP002_Variables.cpp b/CPP002_Variables.cpp
index 2f399b8..a3f9cbf 100644
--- a/CPP002_Variables.cpp
+++ b/CPP002_Variables.cpp
@@ -2,7 +2,7 @@
 
 using namespace std;
 
-main()
+int main()
 {
     //Declaring an integer type variable A, allocates 4 bytes of memory.
     int A=4;
@@ -23,4 +23,6 @@ main()
     A=10;
     cout<<A <<endl;
     cout<<&A;
+    
+    return 0;
 }
diff --git a/CPP003_Variables_Types.cpp b/CPP003_Variables_Types.cpp
index fbc569a..049b636 100644
--- a/CPP003_Variables_Types.cpp
+++ b/CPP003_Variables_Types.cpp
@@ -2,7 +2,7 @@
 
 using namespace std;
 
-main()
+int main()
 {
     int a=10,b=35; // 4 bytes
     cout<<"Value of a : "<<a<<" Address of a : "<<&a <<endl;
@@ -44,4 +44,5 @@ main()
     const string myname="Tridib";
     cout << myname << endl;
 
+    return 0;
 }
diff --git a/CPP004_Input.cpp b/CPP004_Input.cpp
index 97a939c..2dbfe63 100644
--- a/CPP004_Input.cpp
+++ b/CPP004_Input.cpp
@@ -2,7 +2,7 @@
 
 using namespace std;
 
-main()
+int main()
 {
     // cin - console input
     int a;
@@ -19,4 +19,5 @@ main()
 
     cout << "Welcome "<<name<<" "<<surname<<endl;
 
+    return 0;
 }
diff --git a/CPP005_Arithmetic_Assignment_Increment_Decrement_Operators.cpp b/CPP005_Arithmetic_Assignment_Increment_Decrement_Operators.cpp
index 0f51548..333e957 100644
--- a/CPP005_Arithmetic_Assignment_Increment_Decrement_Operators.cpp
+++ b/CPP005_Arithmetic_Assignment_Increment_Decrement_Operators.cpp
@@ -2,7 +2,7 @@
 
 using namespace std;
 
-main()
+int main()
 {
     int a=10,b=5;
 
@@ -18,4 +18,5 @@ main()
     cout << a++ <<endl; //Post-Increment
     cout << a-- <<endl; //Post-decrement
 
+    return 0;
 }
diff --git a/CPP006_Relational_Operators.cpp b/CPP006_Relational_Operators.cpp
index e3239a7..ce1b241 100644
--- a/CPP006_Relational_Operators.cpp
+++ b/CPP006_Relational_Operators.cpp
@@ -7,7 +7,7 @@
 
 using namespace std;
 
-main()
+int main()
 {
     cout<<"Relational Operators !"<<endl;
 
@@ -21,4 +21,6 @@ main()
     cout << (a<=b)<<endl;
     cout << (a>=b)<<endl;
     cout << !(a==b)<<endl; // (a!=b)
+
+    return 0;
 }
diff --git a/CPP007_Logical_Operators.cpp b/CPP007_Logical_Operators.cpp
index 11f3650..a860927 100644
--- a/CPP007_Logical_Operators.cpp
+++ b/CPP007_Logical_Operators.cpp
@@ -7,7 +7,7 @@
 
 using namespace std;
 
-main()
+int main()
 {
     // AND - &&
     // True only when both the expressions are true
@@ -25,4 +25,5 @@ main()
     // Return true if result is false and vice versa.
     cout << !(7>5 && 5!=10) <<endl;
 
+    return 0;
 }
diff --git a/CPP008_Calculator_Exercise.cpp b/CPP008_Calculator_Exercise.cpp
index 3404039..2491ccc 100644
--- a/CPP008_Calculator_Exercise.cpp
+++ b/CPP008_Calculator_Exercise.cpp
@@ -6,7 +6,7 @@
 #include <iostream>
 using namespace std;
 
-main()
+int main()
 {
     double var1, var2;
 
@@ -59,4 +59,6 @@ main()
 
     if (decision2 == 'y' || decision2 == 'Y')
         goto beginning;
+
+    return 0;
 }
diff --git a/CPP009_Arrays.cpp b/CPP009_Arrays.cpp
index 23c5e8e..12bcdc6 100644
--- a/CPP009_Arrays.cpp
+++ b/CPP009_Arrays.cpp
@@ -6,7 +6,7 @@
 #include <iostream>
 using namespace std;
 
-main()
+int main()
 {
     int array[4]; //Type_Name[Size_of_Elements]
 
@@ -24,4 +24,6 @@ main()
 
     if(&array[0] == array)
         cout<<"TRUE";
+
+    return 0;
 }
diff --git a/CPP010_Multidimensional_Arrays.cpp b/CPP010_Multidimensional_Arrays.cpp
index 3e9cfed..6fd499a 100644
--- a/CPP010_Multidimensional_Arrays.cpp
+++ b/CPP010_Multidimensional_Arrays.cpp
@@ -6,7 +6,7 @@
 #include <iostream>
 using namespace std;
 
-main()
+int main()
 {
     int biArray[3][4]={0}; //Initialize all array elements to zero
 
@@ -30,4 +30,6 @@ main()
     cout<<biArray[0][0]<<","<<biArray[0][1]<<","<<biArray[0][2]<<","<<biArray[0][3]<<endl;
     cout<<biArray[1][0]<<","<<biArray[1][1]<<","<<biArray[1][2]<<","<<biArray[1][3]<<endl;
     cout<<biArray[2][0]<<","<<biArray[2][1]<<","<<biArray[2][2]<<","<<biArray[2][3]<<endl;
+
+    return 0;
 }
diff --git a/CPP011_For.cpp b/CPP011_For.cpp
index 9ca2f46..443f7ff 100644
--- a/CPP011_For.cpp
+++ b/CPP011_For.cpp
@@ -6,7 +6,7 @@
  #include<iostream>
  using namespace std;
 
- main() {
+ int main() {
     /*
         for(initialization;condition;inc/dec)
             instructions_to_repeat;
@@ -28,4 +28,6 @@
     for(;;)
         cout<<"Stop me if you can !"<<endl;
     */
+
+   return 0;
  }
diff --git a/CPP012_While_DoWhile.cpp b/CPP012_While_DoWhile.cpp
index f064975..0db17cd 100644
--- a/CPP012_While_DoWhile.cpp
+++ b/CPP012_While_DoWhile.cpp
@@ -6,7 +6,7 @@
 #include<iostream>
 using namespace std;
 
-main() {
+int main() {
     int i=0;
     while(i<10) {
         cout<<"Hello"<<endl;
@@ -24,4 +24,6 @@ main() {
         i--;
     }
     while(i);
+
+    return 0;
 }
diff --git a/CPP013_Counting_Digits_Exercise.cpp b/CPP013_Counting_Digits_Exercise.cpp
index 2e8cd6e..a4b426e 100644
--- a/CPP013_Counting_Digits_Exercise.cpp
+++ b/CPP013_Counting_Digits_Exercise.cpp
@@ -6,7 +6,7 @@
 #include<iostream>
 using namespace std;
 
-main() {
+int main() {
     int num,digits_count=1;
     cin>>num;
     int temp=num;
@@ -16,4 +16,6 @@ main() {
         digits_count++;
 
     cout<<"The number "<<num<<" has "<<digits_count<<" digit(s)"<<endl;
+
+    return 0;
 }
diff --git a/CPP014_Nested_Loops.cpp b/CPP014_Nested_Loops.cpp
index 16d853e..635a45c 100644
--- a/CPP014_Nested_Loops.cpp
+++ b/CPP014_Nested_Loops.cpp
@@ -6,7 +6,7 @@
 #include<iostream>
 using namespace std;
 
-main() {
+int main() {
     for(int i=1;i<=10;i++) {
         cout<<"Multiplication table of "<<i<<endl;
         for(int j=1;j<=10;j++) {
@@ -15,4 +15,6 @@ main() {
         }
         cout<<endl;
     }
+
+    return 0;
 }
diff --git a/CPP015_Break_Continue.cpp b/CPP015_Break_Continue.cpp
index 3b827e1..090c733 100644
--- a/CPP015_Break_Continue.cpp
+++ b/CPP015_Break_Continue.cpp
@@ -6,7 +6,7 @@
 #include<iostream>
 using namespace std;
 
-main() {
+int main() {
     for(int i=1;i<=10;i++) {
         if(i==3)
             continue; //Everything after continue WONT BE executed.
@@ -22,4 +22,6 @@ main() {
         }
         cout<<endl;
     }
+
+    return 0;
 }
diff --git a/CPP016_Variables_Scope.cpp b/CPP016_Variables_Scope.cpp
index 91c8bb9..db76909 100644
--- a/CPP016_Variables_Scope.cpp
+++ b/CPP016_Variables_Scope.cpp
@@ -10,7 +10,7 @@ using namespace std;
 
 int globalVariable;
 
-main() {
+int main() {
 
     //Variables declared within a block are called Local Variables.
     int localVariable;
@@ -27,4 +27,5 @@ main() {
     cout<<result; // Error as result is local to the if block
     */
 
+   return 0;
 }