Selective Word repetation Count

#include <iostream>
#include <stdio.h>
using namespace std;

class SWRC
{
private:
    char paragraph[100];
public:
    void setPara()
    {
        gets(paragraph);
    }
    void CountSelectiveWord()
    {
        char word[100] = "abc";
        int Count=0,i=0,j=0,k=0;
        for(i=0; paragraph[i] != '\0'; i++)
        {
            if(paragraph[i] == 'a' && paragraph[i+1] == 'b' && paragraph[i+2]== 'c')
            {
                Count++;
                if((paragraph[i+3]>=65 && paragraph[i+3]<=122) || (paragraph[i-1]>=65 && paragraph[i-1]<=122))
                {
                    Count--; // if there is another letter after or before 'abc' then it will skip (Using ASCII value)
                            // as example 'xabc' or 'abcz' will not count
                }

            }

        }
        cout << "\nNumber of 'abc' Repetition: " << Count <<endl;
    }
};
int main()
{
    SWRC obj;
    cout << "Input paragraph: ";
    obj.setPara();
    obj.CountSelectiveWord();

    return 0;
}