C++ 2. Write a function named “isNumberString” that accepts a C-string (an array of characters with a NULL terminating character)and returns true if that C-string contains a valid integer number and false otherwise. A valid number string is defined as a string starting with an optional sign of '+' or '-'  and contains only digits after that. For example, "123456" or "+1234" will return true and 1 "-4567" will return true and -1 "0" will return true and 0 "123A" will return false and 0 "A456" will return false and 0 The requirement is that you cannot use any string conversion function or method such as strtoi or strlen. You are required to do the check yourself  by examining each character in the C-string and performing the validity check in the method. This function works with C-string and not string class. It also means that you should not pass the size of the string to the function as a parameter. Please use only pointer notation. Please do not use or refer the string class in this function.

Write c++

Write a C++ program that reads a list of numbers from a file into an array, then uses that array to find the average of all the numbers, the average of the positive and negative numbers (0 is neither positive nor negative!), and the largest number. The point is to be able to store data in an array and do things with it Your program must contain at least the following four functions... read_list() This function will take as input parameters an array of integers and a string filename. It will open that file and read in numbers, storing them in the array, stopping at the end of the file. Remember that there are tricky issues with extra whitespace at the end of the file. You can assume the file contains only integers. The function will return the number of numbers that were read in.Note: In versions of Visual C++ pre-2010, when using the open function with a string argument, you must call the c_str() function on the string variable, such as:my_input_stream.open( filename.c_str() ) 2.…

Consider the following line of code: X = new int*[n]; What should the type of x be? O int O int* O int** O int& O None of the above

Match the std::string constructor on right to its function on left. Source: https://cplusplus.com/reference/string/string/string/ E string() string (const string& str) string (const char* s) string (size_t n, char c) [Choose] [Choose ] constructs a copy of str. constructs an empty string, with a length of zero characters. copies the null-terminated character sequence (C-string) pointed by s. fills the string with n consecutive copies of character c. [Choose ]

Which of the following are true? O The C-library has many functions that are useful in manipulating strings. V If a and b are two different C-string variables, the value in a can be assigned the value in b with the following C-statement: a = b; %3D O The length of the char array holding the string must be at least one character longer than the string itself. O An array identifier cannot be used as a pointer. V The identifier, name, of a C-string is also a pointer to a char data type. The ending character in a C-string must be the newline character, '\n'. O The name of a 1-D array is a pointer to the data type of the array, while the name of a 2-D array is a pointer to a 1-D array of the data type.

Given an array of integers of size 10. Write a C++ function that takes the array as a parameter and returns the numbers of elements in the array that are small. A number is called "small" if it is in the range 1..10 inclusive. int ele[10] = {12, 56, -18, 1, 6, 4, 92, 2, 34, 78};; Expected Output: 4

Declare a two-dimensional char array that is 25 by 25 that represents the entire ocean and an If statement that prints “HIT” if a torpedo hits a ship given the coordinates X and Y. Write a C++ program that will read in a file representing a game board with 25 lines where each line has 25 characters corresponding to the description above. An example file might look like:    ~~~~~~~~~~~~~~~~~~~~~~~~~    ~~~~~~~~~~~~~~~~~~~~~~~~~    ~~~~~~~~~~~~~~~~~~~~~~~~~    ~~~~~~#####~~~~~~~~~~~~~~    ~~~~~~~~~~~~~~~~~~~~~~~~~    ~~~~~~~~~~~~~~#~~~~~~~~~~    ~~~~~~~~~~~~~~#~~~~~~~~~~    ~~~~~~~~~~~~~~#~~~~~~~~~~    ~~~~~~~~~~~~~~#~~~~~~~~~~    ~~~~~~~~~~~~~~#~~~~~~~~~~    ~~~~~~~~~~~~~~~~~~~~~~~~~    ~~~~~~~~~~~~~#####~~~~~~~    ~~~~~~~~~~~~~~~~~~~~~~~~~    ~######~~~~~~~~~~~~~~~~~~    ~~~~~~~~~~~~~~~~~~~~~~~~~    ~~~~~~~~~~#####~~~~~~~~~~    ~~~~~~~~~~~~~~~~~~~#~~~~~    ~~~~~~~~~~~~~~~~~~~#~~~~~    ~~~~~~~~~~~~~~~~~~~#~~~~~    ~~~~~~~~~~~~~~~~~~~#~~~~~    ~~~######~~~~~~~~~~#~~~~~…