Explain the following code:  #include   using namespace std;    int sum(int(*) (int), int);   int square(int);   int cube(int);    int main()  {      cout << sum(square, 4) << endl;      cout << sum(cube, 4) << endl;  system("pause");  }      int sum(int(*pf) (int k), int n)  {    int s = 0;  for (int i = 1; i <= n; i++)  s = s + (*pf) (i);  return s;  }  int square(int k)  {  return k*k;  }    int cube(int k)  {  return k*k*k;  }

C++ 6.34 #include <iostream>#include <cstdlib>#include <ctime>using namespace std; void guessGame(); // function prototypebool isCorrect( int, int ); // function prototype int main(){srand( time( 0 ) ); // seed random number generatorguessGame();} // end main // guessGame generates numbers between 1 and 1000 and checks user's guessvoid guessGame(){int answer; // randomly generated numberint guess; // user's guesschar response; // 'y' or 'n' response to continue game // loop until user types 'n' to quit gamedo {// generate random number between 1 and 1000// 1 is shift, 1000 is scaling factoranswer = 1 + rand() % 1000; // prompt for guesscout << "I have a number between 1 and 1000.\n" << "Can you guess my number?\n" << "Please type your first guess." << endl << "? ";cin >> guess; // loop until correct numberwhile ( !isCorrect( guess, answer ) ) cin >> guess; // prompt for another gamecout << "\nExcellent! You guessed the…

3. Assume you have the following structure definition: struct parts { string name; int num; float price; int qInStock; }; a. Write a program that declares an array of the parts structure, size 10, name of your choice, and includes the following: Write a void function to request user input into each of the component members of the parts structure array. Be sure to include proper user prompts. Assume the entire structure array is filled. Write the prototype and the function definition. Call the function from main.Write a void function to output the information in the parts structure array. Write the prototype and the function definition. Call the function from main.

typedef char string[50]; struct a Tag { int a; }; // 1. indicate the data type returned by function Exam() Exam(struct a Tag *ptr) { float b; double C[ 10 ]; string s; } // Access the members of the structure variable indirectly via ptr // You are REQUIRED to use the structure pointer operator; see comments numbered 2 to 5. // 2. input the value of member a scanf("%d", ); // 3. assign 3.1416 as the value of member b = 3.1416; // 4. print the value of the last element of array C. printf("%lf\n", |); // 5. copy "Hello" into string s strcpy( return ptr; , "Hello");

C programming fill in the following code  #include "graph.h" #include <stdio.h>#include <stdlib.h> /* initialise an empty graph *//* return pointer to initialised graph */Graph *init_graph(void){} /* release memory for graph */void free_graph(Graph *graph){} /* initialise a vertex *//* return pointer to initialised vertex */Vertex *init_vertex(int id){} /* release memory for initialised vertex */void free_vertex(Vertex *vertex){} /* initialise an edge. *//* return pointer to initialised edge. */Edge *init_edge(void){} /* release memory for initialised edge. */void free_edge(Edge *edge){} /* remove all edges from vertex with id from to vertex with id to from graph. */void remove_edge(Graph *graph, int from, int to){} /* remove all edges from vertex with specified id. */void remove_edges(Graph *graph, int id){} /* output all vertices and edges in graph. *//* each vertex in the graphs should be printed on a new line *//* each vertex should be printed in the following format:…