C++ Calculate number of characters, words, sentences

C++ Calculate number of characters, words, sentences

#include <iostream> 
#include <sstream> 
#include <cstring> 
#include <algorithm>  
#include <vector>   
#include <cctype>   
 
using namespace std;
 
int main()
{
 
    int i = 0, count = 0,a=0;
    char text[256];
    
    vector<string> sV;
    
    cout<<" Welcome to the  program 2.4 written by Your Name"<<endl;
    cout<<"********************************************************************************"<<endl;
    cout<<endl<<endl<<endl;
    cout << "Enter text (max. 256 characters): ";    
    cin.getline(text, 256, '\n');              
 
    string s(text), word;
    
    cout << "Your text was: " << endl;
    
    for (i=0; i<s.size(); i++){
        if (i == 0) {
            s[i] = toupper(s[i]);
            cout << s[i];
        }
        if (isalpha(s[i])){
            if (s[i-1] =='?' || s[i-1] == '!' || s[i-1] =='.') {
                s[i] = toupper(s[i]);
                cout << s[i];
            }
            else{
                s[i] = tolower(s[i]);
                cout << s[i];
            }
        }
        else if (isdigit(s[i])){
            cout << s[i];
        }
        else if (isspace(s[i])){
            if (s[i-1] != ' ' || s[i+1] != ' ') {
                cout << s[i];
            }
        }
        
        else if (s[i] =='?' || s[i] == '!' || s[i] =='.'){
            if (s[i+1] != ' ' || s[i+1] != ' ') {
                cout << s[i] << " ";
            }
            else {
                cout << s[i];
            }
            count=count+1;
        }
        
    }
     while(s[i] ==' ' || s[i] == '!' || s[i] =='.')
    {
    cout << s[i];
          
            a=a+1;
    }  
    cout << endl;
    
    istringstream instr(s);
    
    while (instr >> word){

        sV.push_back(word);
    }
    
    cout << "Number of characters in text: " << s.length() << endl; 
    cout << "Number of words in text: " <<sV.size() << endl;   
    cout << "Number of sentences in text: " << count << endl;
    system ("pause");
    return 0;
}

Output