Question

Use C++ language, keep it simple

Exercise #2: Strings' operations Write a C++ program that prompts the user to enter a sentence, the program then does the following: 1. Prints the total characters in the sentence. 2. Prints the word count of the sentence, assuming only one space between each tow words. 3. Prints total vowel (a, e, i, o, u) in the sentence. 4. Prints the vowel frequency as shown in the sample below. 5. Prints the sentence in reverse. 6. Prints the total number of characters other than the alphabets (Note: space is a character) 7. Prints the sentence in a way so that the case of each character is changed, i.e. from lower to upper and vice versa. Sample input/output: Enter a string : Dr. Ali likes to play football, tennis, and golf. Character Count : 49 Word Count : 9 Vowel Count : 13 Vowel Frequency : ai ou Reverse: .flog dna sinnet , llabtoof yalp ot sekil ilA .rD Non-aphabet Count : 12 Change Case : AR. ALI LIKES TO PLAY FOOTBALL, TENNIS, AND GOLF.

Answer 1

The logic is explained in comments.

CODE:

#include <iostream>
#include <string>

using namespace std;

int main()
{
string sentence; // to store input from user
int characterCount = 0; // to count characters in the sentence
int wordCount = 0; // to count words in sentence
int vowelTotalCount = 0; // to count vowel in sentence
int vowelCount[5] = {0}; // to count vowel frequency in array
char ch; // current character in the sentence
int nonAlphabetCount = 0; // to count non albhabet in sentence
int index = 0;
  
// prompt to enter a sentence and use getline method to get whole sentence
cout << "Enter a string : ";
getline(cin, sentence);
  
// convert the entered string to character pointer
const char *strSentence = sentence.c_str();
const char *tempStr = strSentence; // to keep the start pointer
  
// make ch to point to first character in sentence
ch = *strSentence;
  
// loop till null character (end of string) not found in the sentence
while(ch != '\0')
{
// increment the character count
characterCount++;
  
// character is a space, increment word count
if(ch == ' ')
wordCount++;
  
// character is non albhabet, increment non albhabet count
if(!isalpha(ch))
nonAlphabetCount++;
  
// character is a vowel increment vowel frequency and total vowel count
if(ch == 'a' || ch == 'A')
{
vowelCount[0]++; // increment frequency count
vowelTotalCount++; // increment total count
}
else if(ch == 'e' || ch == 'E')
{
vowelCount[1]++; // increment frequency count
vowelTotalCount++; // increment total count
}
else if(ch == 'i' || ch == 'I')
{
vowelCount[2]++; // increment frequency count
vowelTotalCount++; // increment total count
}
else if(ch == 'o' || ch == 'O')
{
vowelCount[3]++; // increment frequency count
vowelTotalCount++; // increment total count
}
else if(ch == 'u' || ch == 'U')
{
vowelCount[4]++; // increment frequency count
vowelTotalCount++; // increment total count
}
  
// move the string pointer to next character
strSentence++;
  
// get the current character
ch = *strSentence;
}
  
// increment the word count as last word was not got counted in loop
wordCount++;
  
// diaplay character and word count
cout << "Character Count : " << characterCount << endl;
cout << "Word Count : " << wordCount << endl;
cout << "Vowel Count : " << vowelTotalCount << endl;
  
// display vowel frequency
cout << "Vowel Frequency :" << endl;
cout << "a\te\ti\to\tu" << endl;
for(index = 0; index < 5; index++)
{
for(int tabIndex = 0; tabIndex < index; tabIndex++)
{
cout << "\t";
}
cout << vowelCount[index] << endl;
}
  
// display reverse
strSentence = tempStr; // make strSentence to point to start of sentence
cout << "Reverse : ";
// print from last character
for(index = characterCount - 1; index >= 0; index--)
{
cout << strSentence[index];
}
cout << endl;
  
// display non alphabet count
cout << "Non-alphabet Count : " << nonAlphabetCount << endl;
  
// display change case
strSentence = tempStr; // make strSentence to point to start of sentence
cout << "Change Case : ";
ch = *strSentence; // make ch to point to first character
while(ch != '\0')
{
// if character is lower make it upper
if(ch >= 'a' && ch <= 'z')
cout << (char)('A' + ch - 'a');
// if character is upper make it lower
else if(ch >= 'A' && ch <= 'Z')
cout << (char)('a' + ch - 'A');
// otherwise print as it is
else
cout << ch;
  
strSentence++; // increment string pointer
ch = *strSentence; // make ch to point to current character
}

return 0;
}

#include <iostream> #include <string> using namespace std; int main() string sentence; int characterCount = 0; int wordCount = 0; int vowelTotalCount = 0; int vowelCount[5] = {0}; char ch; int nonAlphabet Count = 0; int index = 0; // to store input from user // to count characters in the sentence // to count words in sentence // to count vowel in sentence // to count vowel frequency in array // current character in the sentence // to count non albhabet in sentence // prompt to enter a sentence and use getline method to get whole sentence cout << "Enter a string : "; getline(cin, sentence); // convert the entered string to character pointer const char *strSentence = sentence.c_str(); const char *tempStr = strSentence; // to keep the start pointer // make ch to point to first character in sentence ch = *strSentence;

// loop till null character (end of string) not found in the sentence while(ch != '\0') // increment the character count characterCount++; // character is a space, increment word count if(ch == ' ') wordCount++; // character is non albhabet, increment non albhabet count if(!isalpha(ch)) nonAlphabetCount++; // character is a vowel increment vowel frequency and total vowel count if(ch == 'a' || ch == 'A') vowelCount[]++; vowelTotalCount++; // increment frequency count // increment total count else if(ch == 'e' || ch == 'E') vowel Count[1]++; vowelTotalCount++; // increment frequency count // increment total count else if(ch == 'i' || ch == 'I')

vowelCount [2]++; vowelTotalCount++; // increment frequency count // increment total count else if(ch == 'o' || ch == '0') vowelCount[3]++; vowelTotalCount++; // increment frequency count // increment total count else if(ch == 'u' || ch == 'U') vowelCount[4]++; vowelTotalCount++; // increment frequency count // increment total count // move the string pointer to next character strSentence++; // get the current character ch = *strSentence; // increment the word count as last word was not got counted in loop wordCount++; // diaplay character and word count cout << "Character Count : " « characterCount << endl; cout << "Word Count : " << wordCount << endl;

cout << "Vowel Count : " << vowelTotalCount << endl; // display vowel frequency cout << "Vowel Frequency :" << endl; cout << "a te ti to tu" << endl; for(index = 0; index < 5; index++) for(int tabIndex = 0; tabIndex < index; tabIndex++) cout << "\t"; cout << vowelCount[index] << endl; // display reverse strSentence = tempStr; // make strSentence to point to start of sentence cout << "Reverse : "; // print from last character for(index = characterCount - 1; index >= 0; index--) cout << str Sentence[index]; cout << endl; // display non alphabet count cout << "Non-alphabet Count : " << nonAlphabet Count << endl;

// display change case strSentence = tempStr; // make strSentence to point to start of sentence cout << "Change Case : "; ch = *strSentence; // make ch to point to first character while(ch!= '\0') // if character is lower make it upper if(ch >= 'a' && ch <= 'z') cout << (char) ('A' + ch - 'a'); // if character is upper make it lower else if(ch >= 'A' && ch <= 'Z') cout << (char) ('a' + ch - 'A'); // otherwise print as it is else cout << ch; strSentence++; ch = *strSentence; // increment string pointer // make ch to point to current character return 0;

OUTPUT:

Enter a string : Dr. Ali likes to play football, tennis, and golf. Character Count : 49 Word Count : 9 Vowel Count : 13 Vowel Frequency : i ou Reverse : .flog dna ,sinnet ,llabtoof yalp ot sekil ilA .D Non-alphabet Count : 12 Change Case : dR. ALI LIKES TO PLAY FOOTBALL, TENNIS, AND GOLF.