Write a pseudo code to find the length of a string without using any library function (e.g, strlen())

in C++ solve the following question in the picture :

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; }

write a c++ function that counts the words in a string but does not include numbers   for example :  if you type in: "too good to be true" ---> you get 5 words in total. "2019" ----> 0 words