Chapter 10, Problem 37RQE

Explanation of Solution

Use of pointers to pass C-string argument:

In C++, for passing C-string argument the pointers are extremely useful. Each letter is passed through the pointer parameter variable. It will read until the null character, are part of the string.

Example program:

Consider the example that defines a function that uses a pointer to count the number of times a particular letter appears in a C-string is as follows:

//Header files

#include<iostream>

using namespace std;

//function prototype

int count(char*, char c);

// Define Main function

int main()

{

//Declare the constant variable

const int S = 20;

// Declare the variables as char type

char str[S], l;

//Get the input string from the user

cout << "Enter the string: ";

cin.getline(str, S);

//Get the letter from the user

cout << "Enter a letter: ";

cin >> l;

//call the function

cout << "The total number of times the " << ...