Given: string s; int first, last; Write code to repeatedly validate that first is less than last and both first and last are valid indexes of the string s. Then print all characters of the string s from index first to last inclusive. Example Output 1 Enter a string and two indexes: Queensborough 2 5 eens Example Output 2 Enter a string and two indexes: Science 2 10 Enter a string and two indexes: Science -15 Enter a string and two indexes: Science 2 4 ien

In C# please

Declare a function named contains_char. Its purpose is when given two strings, the first of any length, the second a single character, it will return True if the single character of the second string is found at any index of the first string, and return False otherwise.

Task: 5 Working with Characters and StringsExercise 1: Retrieve program stringchar.cpp from the Lab 2 folder. Thisprogram illustrates the use of characters and strings. The char data typeallows only one character to be stored in its memory location. The stringdata type (actually a class and not a true data type built into the language)allows a sequence of characters to be stored in one memory location. Thecode follows: // This program demonstrates the use of characters and strings// PLACE YOUR NAME HERE#include <iostream>#include <string>using namespace std;// Definition of constantsconst string FAVORITESODA = "Dr. Dolittle"; // use double quotes for stringsconst char BESTRATING = 'A'; // use single quotes for charactersint main(){ char rating; // 2nd highest product ratingstring favoriteSnack; // most preferred snackint numberOfPeople; // the number of people in the surveyint topChoiceTotal; // the number of people who prefer the top choice// Fill in the code to do the…