add: cpp-programming-ques 06_operator friend 09

Author: webwithaman

.vscode/settings.json

@@ -0,0 +1,5 @@
+{
+  "files.associations": {
+    "iostream": "cpp"
+  }
+}

06_operator_overloading_and_friend_function/06_concatenation_compare_strings.cpp

@@ -66,6 +66,12 @@ class CString
         return s;
     }
 
+    // // instance member function print string
+    void printString()
+    {
+        cout << str;
+    }
+
     // // overload binary addition operator (+) to concate two strings
     CString operator+(CString str1)
     {

06_operator_overloading_and_friend_function/08_matrix_negation.cpp

@@ -12,7 +12,6 @@ Overload the - (Unary) should negate the numbers stored in the object.
 // // Header files
 #include <iostream>
 #include <conio.h>
-#include <stdlib.h>
 #include <iomanip>
 
 // // use namespace

06_operator_overloading_and_friend_function/09_overload_logical_not.cpp

@@ -0,0 +1,122 @@
+/*
+
+Consider the following class mystring
+Class CString
+{
+  char str [100];
+};
+Overload operator “!” to reverse the case of each alphabet in the string (Uppercase to Lowercase and vice versa).
+
+*/
+
+// // Header files
+#include <iostream>
+#include <conio.h>
+#include <string.h>
+
+// // use namepsace
+using namespace std;
+
+// // define class CString
+class CString
+{
+
+public:
+    // // static member variable
+    static const int MAX_CHARS = 101;
+
+private:
+    // // instance member variables
+    char str[MAX_CHARS];
+    int length;
+
+public:
+    // // constructors
+    CString()
+    {
+        length = 0;
+    }
+
+    CString(const char *s)
+    {
+        strcpy(str, s);
+        length = strlen(str);
+    }
+
+    CString(char *s)
+    {
+        strcpy(str, s);
+        length = strlen(str);
+    }
+
+    // // overloaded instance member function to set string
+    void setString(const char *s)
+    {
+        strcpy(str, s);
+        length = strlen(str);
+    }
+
+    // // overloaded instance member function to set string
+    void setString(char *s)
+    {
+        strcpy(str, s);
+    }
+
+    // // instance member function to get string
+    char *getString(char *s)
+    {
+        strcpy(s, str);
+        return s;
+    }
+
+    // // instance member function print string
+    void printString()
+    {
+        cout << str;
+    }
+
+    // // overload logical not (!) operator
+    CString operator!()
+    {
+        CString temp;
+        int i;
+        for (i = 0; str[i]; i++)
+        {
+            if (str[i] >= 'A' && str[i] <= 'Z')
+                temp.str[i] = str[i] + 32;
+            else if (str[i] >= 'a' && str[i] <= 'z')
+                temp.str[i] = str[i] - 32;
+            else
+                temp.str[i] = str[i];
+        }
+        temp.str[i] = 0; // add null character to terminate string
+
+        return temp;
+    }
+};
+
+// // Main Function Start
+int main()
+{
+    char str1[CString::MAX_CHARS], str2[CString::MAX_CHARS], str3[CString::MAX_CHARS];
+
+    // // Get string
+    cout << "\nEnter Any String (s1) (MAX_CHARACTERS " << CString::MAX_CHARS << ") => ";
+    cin.getline(str1, CString::MAX_CHARS);
+
+    CString s1(str1), s2; // create objects of CString class
+
+    cout << "\nString => ";
+    s1.printString();
+
+    // // perform operation of string
+    s2 = !s1;
+
+    cout << "\nResult After Performing (s2 = !s1) Operation On String => ";
+    s2.printString();
+
+    cout << endl; // Add new line
+    getch();
+    return 0;
+}
+// // Main Function End