In an occation if u are invited or not, this program will check this.

  #include<conio.h>

  #include<stdio.h>

  #include<math.h>

  void main()

  {

      clrscr();

      int inv,mage,fage,age;

      printf("If invited press 1=");

      scanf("%d",&inv);

      if(inv==1)

     { printf("press 1 for male=");

       scanf("%d",&age);

       if(age==1)

     {  printf("Enter age for male=");

                scanf("%d",&mage);

                if(mage>40)

                {  printf("go");  }

                else

                {  printf("do not go");   }

                     }

      else

       { printf("enter age for female=");

       scanf("%d",&fage);

       if(fage<40)

                {  printf("go");  }

                else

                {  printf("do not go");   }

                     }

                                }

      else

      {printf("you are not invited");}

                                   getch();

                                                                  }