but when we make pointer of Class A which points to object of Class B, that pointer cannot use any data member of class B. it can use member of Class A only as this pointer belongs to class A. so what's the use to pointer to derived class ?

but when we make pointer of Class A which points to object of Class B, that pointer cannot use any data member of class B. it can use member of Class A only as this pointer belongs to class A. so what's the use to pointer to derived class ?

hi I program with c in linux distribution ubuntu I cried file type dat but when I compile program I can't see file

The idea is in using virtual functions with it, it is one of the ways (the most common in C++ I think) of implementing dynamic polymorphism. So let's say you have a message queue, you can create a base class of Message that have one virtual function process(), then you can create many different subclasses implementing this function differently, but you don't have to change the code that processes the queue when you add a new message type, because it works with the pointer of type Message to call process() on it.

Hello guys I need your help

6. Vowels and Consonants Write a function that accepts a pointer to a C-string as its argument. The function should count the number of vowels appearing in the string and return that number. Write another function that accepts a pointer to a C-string as its argument. This func tion should count the number of consonants appearing in the string and return that number. Demonstrate these two functions in a program that performs the following steps: 1. The user is asked to enter a string. 2. The program displays the following menu: A) Count the number of vowels in the string B) Count the number of consonants in the string C) Count both the vowels and consonants in the string D) Enter another string E) Exit the program 3. The program performs the operation selected by the user and repeats until the user selects E to exit the program.

#include <iostream> #include <cstring> #include <cctype> #include <cstdlib> using namespace std; void intro(); void menu(); char choice(); int count_vowels(char []); int count_consonants(char[], int); int main() { char user_choice; intro(); do { int LENGTH = 80; int total_vowels; int total_consonants; char c_string[LENGTH]; cout<<endl; cout<<"Enter a sentence: "; cin.getline(c_string, LENGTH); cout<<endl; menu(); user_choice = choice(); total_vowels = count_vowels(c_string); total_consonants = count_consonants(c_string, total_vowels); if(user_choice == 'A') { cout<<"You have chosen to count the number of vowels\n"; cout<<"The total vowels in that sentence is "<<total_vowels<<endl; } else if(user_choice == 'B') { cout<<"You have chosen to count the number of consonants\n"; cout<<"The total consonants in that sentence is "<<total_consonants<<endl; } else if(user_choice == 'C') { cout<<"You have chosen to count both vowels and consonants\n"; cout<<"The total vowels in that sentence is "<<total_vowels<<endl; cout<<"The total consonants in that sentence is "<<total_consonants<<endl; } else if(user_choice == 'D') { cout<<"Enter a string: "; cin.getline(c_string, LENGTH); cout<<endl; } else { cout<<"Good bye!\n"; exit(EXIT_SUCCESS); } }while(user_choice != 'E'); return 0; } void intro() { cout<<"This is a vowel and consonants program in C++\n"; cout<<"----------------------------------------------\n"; cout<<endl; } void menu() { cout<<endl; cout<<"Here are the menu: \n"; cout<<endl; cout<<"A) Count the number of vowels in the string\n"; cout<<"B) Count the number of consonants in the string\n"; cout<<"C) Count both the vowels and consonants in the string\n"; cout<<"D) Enter another string\n"; cout<<"E) Exit the program\n"; cout<<endl; } char choice() { char user_choice; cout<<"Enter your choice: "; user_choice = cin.get(); cin.ignore(); cout<<endl; return toupper(user_choice); } int count_vowels(char sentence[]) { int count = 0; int total = 0; while(*(sentence + count) != '\0') { if(tolower(sentence[count]) == 'a' || tolower(sentence[count]) == 'e' || tolower(sentence[count]) == 'i' || tolower(sentence[count]) == 'o' || tolower(sentence[count]) == 'u') total += 1; count += 1; } return total; } int count_consonants(char *sentence, int total_vowels) { int total_consonants = 0; int length = strlen(sentence); for(int count = 0; count < length; count++) { if(*(sentence + count) == ' ' || *(sentence + count) == '.' || *(sentence + count) == ',') length--; } total_consonants = length - total_vowels; return total_consonants; }

pls what is VLA?

I've problem with d option in the menu

yes

it will appear a enter another sentence twice

when the option is chosen it repeats twice

case 'D': strinput == 0;

Excuse me, how do we make a align center in C program? For example i have | | bracket that can fit 4 character, and when i fill 2 character i want it to align center, how can i do that?

So |char| become |ch| ?

yes

printf("|%s|", str) ?

Hello pls it did not work. I tried continue statement it seems it works. if user_choice == 'D': continue;

pls try it and give me feedback

You get my point wrong, i mean use variable to check if the user go to the D input

pls can you illustrate for me?

if else condition checks how many conditions???

if ... else if....else if....can be as many as you want if else checks only two conditions, though you can pass as many conditions in one if using &&

little bit more explanation how does if else check two conditions

2 conditions in one if,

then if statement can contain many conditions

Hello I'm new in this fu**ing world

#include<iostream> #include<string> #include<fstream> using namespace std; ifstream fin; ofstream fout; int main() { fout.open("CallDataRecord.txt", ios::app); fout<<"0899011200, 31 October 2021,0800,1100"; fout.close(); cout<<"Message from the file is:\n"; fin.open("CallDataRecord.txt", ios::in); string msg; getline(fin, msg); fin>>msg; cout<<msg<<endl; system("PAUSE"); return 0;}

Pleas any one interested Let me know Or come private I really need some one who can know c++

Warning\Error sh:1:PAUSE:not found

It there a way I can pass 2 different parameters with two different data structure

pause