Q. Enter correct password for proceed ?

THE OUTPUT WOULD BE

 
#include<stdio.h>
#include<conio.h>
  void main( )
  {      clrscr( );
          int n,c=0;
          printf("Enter four digit password=");
          scanf("%d",&n);
          if(n==1212)
          { float r,ar;
             printf("Area of a circle\n");
             printf("Enter radius=");
             scanf("%f",&r);
             ar=3.14*r*r;
             printf("Area of circle=%f",ar);

          }
          else
          { printf("\nWrong password");
             for( ; ; )
             { printf("\n\nAgain enter a four digit password=");
                scanf("%d",&n);
                if(n!=1212)
                { printf("\nWrong password");
                }
                if(n==1212)
                { float r,ar;
                   printf("Area of a circle\n");
                   printf("Enter radius=");
                   scanf("%f",&r);
                   ar=3.14*r*r;
                   printf("Area of circle=%f",ar);
                   break;
                }
                c++;
                if(c==2)
                break;
             }
          }
          getch( );
}

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