zoj 1763 A Simple Question of...

#include<stdio.h>int main(){   double f1,f2,diff;   scanf("%lf",&f1);   if(f1==999.0)     printf("End of Output");   else   while(1)   {        scanf("%lf",&f2);     if(f2==999.0)     {        printf("End of Output");        break;     }     else     {       diff=f2-f1;       printf("%.2lfn",diff);       f1=f2;     }   }   return 0;}