chapter 3 update

Author: ShiqiYu

.gitignore

@@ -0,0 +1,5 @@
+*.out
+settings.json
+week01/~$Lecture01.pptx
+week02/~$Lecture02.pptx
+week03/~$Lecture03.pptx

README.md

@@ -8,31 +8,7 @@ Course 'CS205 C/C++ Program Design' in 2021 Fall at Southern University of Scien
 
 ## [Chapter 2: Data Types and Arithmetic Operators](week02/README.md)
 
-## Chapter 3: Loops and Branching Statements
-
-### if-else if- else
-
-### ? : operator
-
-### for loop (break, continue)
-
-### while loop (break, continue)
-
-### switch case (break )
-
-### goto
-
-### Relational expressions
-
- <, <=, >, >=, ==, !=
-
-### Logical expressions ( and, or, not), precedence
-
-### bool and integers
-
-### Lab
-* a calculator? 
-* Makefile (how to manage multiple source files using a Makefile)
+## [Chapter 3: Loops and Branching Statements](week03/README.md)
 
 ## Chapter 4: Data Structures
 

week03/Lecture03.pptx

@@ -0,0 +1,27 @@
+# Chapter 3: Loops and Branching Statements
+
+## if-else if- else
+
+## ? : operator
+
+## for loop (break, continue)
+
+## while loop (break, continue)
+
+## switch case (break )
+
+## goto
+
+## Relational expressions
+
+ <, <=, >, >=, ==, !=
+
+## Logical expressions ( and, or, not), precedence
+
+## bool and integers
+
+## Exercises
+
+* a calculator? 
+
+* Makefile (how to manage multiple source files using a Makefile)

week03/README.md

@@ -0,0 +1,14 @@
+#include <iostream>
+using namespace std;
+int main()
+{
+    int sum = 0;
+    for(int i = 0; i < 10; i++)
+    {
+        sum += i;
+        cout << "Line " << i << endl;
+    }
+    cout << "sum = "  << sum << endl;
+
+    return 0;
+}

week03/examples/for.cpp

@@ -0,0 +1,35 @@
+#include <iostream>
+using namespace std;
+
+int main()
+{
+    int num  = 10;
+    if (num < 5)
+        cout << "The number is less than 5. " << endl;
+    
+    if (num == 5 )
+    {
+        cout << "The number is 5." << endl;
+    }
+    else
+        cout << "The number is 5." << endl;
+    
+    if (num < 5)
+        cout << "The number is less than 5." << endl;
+    else if (num > 10)
+        cout << "The number is greater than 10." << endl;
+    else
+        cout << "The number is in range [5, 10]." << endl;
+
+    if(num < 20)
+    if(num < 5)
+    cout << "The number is less than 5" << endl;
+    else
+    cout << "Where I'm?" << endl;
+
+    int * p = new int[1024];
+    if (p)
+        cout << "Memory has been allocated." << endl;
+
+    return 0;
+}

week03/examples/if.cpp

@@ -0,0 +1,28 @@
+#include <iostream>
+using namespace std;
+int main()
+{
+    int num = 10;
+    while(num > 0)
+    {
+        cout << "num = " << num << endl;
+        num--;
+    }
+
+    num = 10;
+    do
+    {
+        cout << "num = " << num << endl;
+        num--;
+    }while (num > 0);
+
+    num = 10;
+    while (num > 0)
+    {
+        cout << "num = " << num << endl;
+        num--;
+        if (num == 5)
+            break;
+    }
+    return 0;
+}