+ is my answer correct ? Write a function to convert a given string : Answer: #include #include using namespace std;   void toUpper(string &str) {         for (int i = 0; i < str.length(); i++)     {         str[i] = toupper(str[i]);     } }   void toLower(string &str) {        for (int i = 0; i < str.length(); i++)     {         str[i] = tolower(str[i]);     } }   int main() {     string str = "khaled";     toUpper(str);     cout << str << endl;       str = "MOHAMMED";     toLower(str);     cout << str << endl;       return 0; }   Write a function to calculate the sum of the even number from 1 - 100. Answer: #include using namespace std;   int sumEven() {        int sum = 0;           for (int i = 1; i <= 100; i++) {                 if (i % 2 == 0) {                         sum += i;         }     }     return sum; } int main() {     cout << sumEven

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Declaring and Defining the function

A set of statements, which performs a particular task is called a function. The program gains modularity by using function. The application is quite easy to understand, read, and edit when they are created with functions. The developer/programmer creates a function and uses main() to call the function. Once the function gets executed, the control is transferred to the main program.