+ 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

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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C++

is my answer correct ?

  • Write a function to convert a given string :

Answer:

#include <iostream>

#include <string>

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 <iostream>

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() << endl;

    return 0;

}

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