Guessing Game [C/C++]

#include<stdio.h>
#include<conio.h>
#include<stdlib.h>
#include<iostream>
main()
{
      int a,b,c,d,e,f,f1,points,ctr;
      do{
          system("cls");
          system("color 6");
          srand(time(NULL));
          b=1+rand()%10;
          ctr=3;
          e=b;
          system("cls");
      do{
                        printf("Guess a Number: ");
                        scanf("%d",&a);
                        if(a>b)
                        {
                        printf("Lower Please!!\n");
                        }
                        if(a<b)
                        {
                        printf("Higher Please!!\n");
                        }
                        ctr--;
                        if( ctr==2)
                        {
                        points=15;
                        }
                        if( ctr==1)
                        {
                        points=10;   
                        }
                        if( ctr==0)
                        {
                        points=5;
                        }
                        if(a == b)
                        {
                             system("color 7");
                             printf("\n\nExcellent You Got it!!\n");
                             printf("Your Score is %d\n",points);
                        }
                        }while(a!=b && ctr!=0);
          if(a!=b && ctr==0)
          {
                  system("color 4");
                  printf("\n\nYou did not Get it !! \n%d is the Number!!",e);
                  printf("Your Score is 0");
          }
          printf("\n\n\nTry Again ? 1=Yes 2=No");
          scanf("%d",&d);
          if(d==1)
          {
                  ctr+3;
          }
          if(d==2)
          {
                  break;
          }
          }while(1);
          return(0);
}