View Code of Problem 104

# include<stdio.h>
int main(void)
 {
   float n,v1,v2,t;
   while(scanf("%f%f%f%f",&n,&v1,&v2,&t)!=EOF)
   {
     if(v1<v2)
     {
       printf("NO\n");
     }
     else if(t>=n*1000/(v1-v2))
     {
       printf("%.2f\n",n*1000/(v1-v2));
     }
     else
     {
       printf("NO\n");
     }
   }
   return 0;
 }