main()                                                          
   {                                                               
       float p, cost, p1, cost1;                               
                                                               
       for (p = 0; p <= 10; p = p + 0.1)                           
       {                                                           
           cost = 40 - 8 * p + p * p;                              
           if(p == 0)                                              
           {                                                       
              cost1 = cost;                                        
              continue;                                            
           }                                                       
           if (cost >= cost1)                                      
              break;                                               
           cost1 = cost;                                           
           p1 = p;                                                 
       }                                                           
       p = (p + p1)/2.0;                                           
       cost = 40 - 8 * p + p * p;                                  
       printf("\nMINIMUM COST = %.2f  AT  p = %.1f\n",         
                cost, p);                                      
   }                                                               
                                                            
Output                                                      
                                                        
   MINIMUM COST = 24.00  AT  p = 4.0