Reliability Graph

Problem: The reliability of an electronic component is given by

            reliability (r) = e ^{- l t}

where  l is the component failure rate per hour and t is the time of operation in hours.  A graph is required to determine the reliability at various operating times, from 0 to 3000 hours. The failure rate  l (lamda) is 0.001.

Problem  

   #include <math.h>                                           

   #define  LAMDA   0.001                                     

   main()                                                     

   {  

  double t;                                              

       float r;                                                

       int  i, R;                                             

       for (i=1; i<=27; ++i)

       {

printf("--");

       }                                                      

       printf("\n");                                           

       for (t=0; t<=3000; t+=150)                             

       {

r = exp(-LAMDA*t);                                 

           R = (int)(50*r+0.5);                               

           printf(" |");                                       

           for (i=1; i<=R; ++i)

           {

   printf("*");                                   

           }    

                                             

           printf("#\n");                                     

       } 

       for (i=1; i<3; ++i) 

       {

printf(" |\n"); 

       }

                                                     

   }  

Output                                                     

 -----------------------------------------------------     

    |**************************************************#      

    |*******************************************#             

    |*************************************#                   

    |********************************#                        

    

|***************************#                          

    |************************#                                

    |********************#                                    

    |*****************#                                       

    |***************#                                         

   

|*************#                                         

    |***********#                                             

    

|**********#                                               

    |********#                                                

    |*******#                                                 

    |******#                                                  

    

|*****#                                                    

    |*****#                                                   

    |****#                                                    

    |***#                                                     

    

|***#                                                      

   
      |**#