#include <iostream.h>           

int main()
             { 
   float total, val;
   total=0;

 cout<<"enter value:";
   cin>>val;
   while(val>=0)
   { 
   total = total + val;
   cout <<"enter next value:";
   cin >>val;
   }
   cout <<"total = "<<total<<"\n";
   return 0;
   }

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