Trace the following code and give the output if the user enters in from the keyboard the sequence:152304-1 int val = 0; do { cin >> val; cout << 2 * val << " "; } while (val > 0);

Please fill in the blanks. /* This function asks for 2 strings from the user and asks the user to choose what they want to do with them.   Inputs: 2 strings, and a character for choice. Output: execute that choice.   Choices can be: 'E'/'e': call checkEqual() function                  'C'/'c': call concatStrings() function                   Everything else: invalid and exit  */   #include<__1__> //library to use printf and scanf #include<__2__> //library to use boolean #include<__3__> //library to use exit(0) #define len 1000 /*This function just concatenates 2 strings using a */ __4__ concatStrings(__5__ w1[], __6__ w2[], __7__ w3[]) {             int w3_idx = 0; //index for w3               //Copy word1 w1 over to the combined string             for(int i = 0; __8__ != __9__; i++) //loop runs as long as string is not done             {                         __10__[__11__] = __12__[__13__]; //copy a character from w1 to w3                         w3_idx++; //update…

#include <iostream> #include <cmath>   using namespace std;   // declare functions void display_menu(); void convert_temp(); double to_celsius(double fahrenheit); double to_fahrenheit(double celsius);   int main() {   cout << "Convert Temperatures\n\n";       display_menu();     char again = 'y';     while (again == 'y')      {         convert_temp();           cout << "Convert another temperature? (y/n): ";         cin >> again;         cout << endl;     }     cout << "Bye!\n"; }   // define functions void display_menu()  {     cout << "MENU\n"         << "1. Fahrenheit to Celsius\n"         << "2. Celsius to Fahrenheit\n\n"; }   void convert_temp()  {     int option;     cout << "Enter a menu option: ";     cin >> option;       double f = 0.0;     double c = 0.0;     switch (option)      {         case 1:             cout << "Enter degrees Fahrenheit: ";             cin >> f;               c =…

Explain the code and how it works: #include <iostream>#include <cmath> using namespace std;double to_kilograms(double n){    return n * 0.453592;}double to_pounds(double n){    return n * 2.20462;}double to_kilograms_ref(double& n){    return n * 0.453592;}double to_pounds_ref(double& n){    return n * 2.20462;}double to_kilograms_ptr(double* n){    return *n * 0.453592;}double to_pounds_ptr(double* n){    return *n * 2.20462;}   void display_menu(){    cout << "1.Kilograms to Pounds (pass by value)\n2. Pounds to Kilograms (pass by value)\n3. Kilograms to Pounds (pass by reference)\n4. Pounds to Kilograms (pass by reference)\n5. Kilograms to Pounds (using pointers)\n6. Pounds to Kilograms (using pointers)\nEnter choice\n\n";} void convert(){    int ch;    double w;    cout << "Enter a menu option: ";    cin >> ch;    cout << "Enter weight: ";    cin >> w;     if (ch == 1)        cout << "weight in kg is " << to_kilograms(w);…