Question

C++ CODE

Change your code from Part A to now present a menu to the user asking them for an operation to perform on the text that was input. You must include the following functions in your code exactly as provided. Additionally, you must have function prototypes and place them above your main function, and the function definitions should be placed below the main function. Your program should gracefully exit if the user inputs the character q or sends the EOF signal by pressing Ctrl-D.

1. Write a function with the following prototype: int NumWords(const string&);

This function will take a constant string reference as a parameter and return the number of words in the string.

2. Write a function with the following prototype: int NumNonWSCharacters(const string&);

This function will take a constant string reference as a parameter and return the number of characters contained in the string after all whitespace characters have been removed.

3. Write a function with the following prototype: void CharReplace(string&, char, char);

This function takes three parameters: a string reference to modify, a character to find in the string, and a character to replace each found character with. Replace the corresponding characters in the string reference parameter. The function should not return anything. You may not use string::replace.

4. Write a function with the following prototype: char PrintMenu();

This function will output the menu displayed in the example output below to the console and read and return a single character of input from the user.

Example 1:

Enter a line of text: Help, help, I need some help!

You entered: Help, help, I need some help!

Options

w - Number of words

c - Number of non-whitespace characters

r - Replace a character

q - Quit

Choose an option: w

Number of words: 6

Options

w - Number of words

c - Number of non-whitespace characters

r - Replace a character

q - Quit

Choose an option: c

Number of non-whitespace characters: 24

Options

w - Number of words

c - Number of non-whitespace characters

r - Replace a character

q - Quit

Choose an option: r

Enter a character to find: h

Enter a character to replace: w

New string: Help, welp, I need some welp!

Options

w - Number of words

c - Number of non-whitespace characters

r - Replace a character

q - Quit

Choose an option: r

Enter a character to find: o

Enter a character to replace: a

New string: Help, welp, I need same welp!

Options

w - Number of words

c - Number of non-whitespace characters

r - Replace a character

q - Quit

Choose an option: j

Options

w - Number of words

c - Number of non-whitespace characters

r - Replace a character

q - Quit

Choose an option: q

1. You must call all of the defined functions above in your code. You may not change function names, parameters, or return types.

2. You must use a switch statement to check the user's menu option choice.

3. You may create additional functions in addition to the required functions listed above if you would like.

4. If user provides option which is not a choice in the menu, simply print the menu and prompt for an option again.

Answer 1

SOLUTION-
I have solve the problem in C++ code with comments and screenshot for easy understanding :)

CODE-

//c++ code
#include <iostream>
using namespace std;
// declarations for function asked in assignment.
int NumWords(string &line);
int NumNonWSCharacters(string &line);
char PrintMenu();
void CharReplace(string &line, char rep,char repw);
//main function
//its takes input string from user and call PrintMenu()
// based of choice while loop will run until user enters 'q' or Ctrl-d
//choice is 'w' it call the NumWords(&string) and returns count of letters in it.
//choice is 'c' it call the NumNonWSCharacters(&string) and returns the letter without space
//choice is 'r' it call CharReplace(&string,char,char)
//main function
int main()
{
string line;
char choice,rep,repw;
cout<<"Enter a line of text: ";
getline(cin, line); //gets input
cout<<"You Entered: "<<line<<endl;
choice=PrintMenu(); //user choice
while(choice!='q'|| getline(std::cin, line)){
if(choice=='w')
{
cout<<"Number of words: "<<NumWords(line)<<endl;
}
else if(choice=='c')
{
cout<<"Number of non-whitespace characters: "<<NumNonWSCharacters(line)<<endl;
}
else if(choice=='r')
{
cout<<"Enter a character to find: ";
cin>>rep;
cout<<"Enter a character to replace: ";
cin>>repw;
CharReplace(line,rep,repw);
cout<<"New String: "<<line<<endl;
}
choice=PrintMenu();
}
return 0;
}
//PrintMenu to show options and return choice based on input.
char PrintMenu(){
char choice;
cout<<"\nOptions"<<endl;
cout<<"w - Number of words"<<endl;
cout<<"c - Number of non-whitespace characters"<<endl;
cout<<"r - Replace a character"<<endl;
cout<<"q - Quit"<<endl;
cout<<"Choose an option: ";
cin>>choice;
return choice;
}

//NumWords(&string) it loop the whole string untill '\0' and return count.
int NumWords(string& line){
int count=0;
for(int i=0;line[i]!='\0';i++){
count++;
}
return count;
}
//NumWords(&string) it loop the whole string untill '\0' and if char is space it skips and return count.
int NumNonWSCharacters(string& line){
int count=0;
for(int i=0;line[i]!='\0';i++){
  
if(!isspace(line[i]))
count++;
}
return count;
}
// it replace the rep with repw while iterating each char
void CharReplace(string& line, char rep,char repw){
for(int i=0;line[i]!='\0';i++){
  
if(line[i]==rep){
line[i]=repw;
}

}
}

SCREENSHOT-

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