validation check with string LOL

#include<string.h>
#include<cstring>
#include<stdint.h>
#include<stdio.h>
#include<stdlib.h>
#include<iostream>
using namespace std;


int main()
{
    char confirmation[30],confession[30];
    int repeat,repeat2;

        do
        {
            do
            {
                cout<<"I love u, do u love me?\n\n";
                cin>>confession;
                if(strcmp(confession,"YES")==0||strcmp(confession,"yes")==0||strcmp(confession,"Yes")==0||strcmp(confession,"y")==0)
                {
                    cout<<"aww, thanks for loving me~~~\n\n\n";
                    repeat2=0;
                }
                else
                    if(strcmp(confession,"NO")==0||strcmp(confession,"no")==0||strcmp(confession,"No")==0||strcmp(confession,"n")==0)
                    {
                        cout<<"How could u say u dont love me???\n\n\n";
                        repeat2=0;
                    }
                    else
                    {
                        cout<<"\n\n\nInvalid input. Please key in correctly\n\n\n";
                        system("pause");
                        system("cls");
                        repeat2=1;
                    }
                    system("pause");
                    system("cls");
            }while(repeat2>=1);
        cout<<".....do u wish to continue?? yes? no?";
        cin>>confirmation;

        if(strcmp(confirmation,"YES")==0||strcmp(confirmation,"yes")==0||strcmp(confirmation,"Yes")==0||strcmp(confirmation,"y")==0)
        {
            cout<<"sure\n\n";
            system("pause");
            repeat=1;
            system("cls");
        }
        else
            if(strcmp(confirmation,"NO")==0||strcmp(confirmation,"no")==0||strcmp(confirmation,"No")==0||strcmp(confirmation,"n")==0)
            {
                cout<<"fine.....\n";
                system("pause");
                cout<<"See u again\n\n";
                system("pause");
                system("cls");
                repeat=0;
                cout<<repeat;
                system("pause");
            }
            else
            {
                cout<<"Invalid input. Please key in correctly\n\n";
                repeat=1;
                system("cls");

            }
        }while(repeat>=1);

return 0;
}