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  4. Read file, write to array, find min and max

Read file, write to array, find min and max

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  • M Mattias G

    If not using STL at all is an option, you might ask yourself why you store the numbers in an array in the first place. Just keep track of the smallest and largest numbers you fscanf'ed so far.

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    rocky_pulley
    wrote on last edited by
    #8

    it sounds like he has to for a homework assignment. It sounds like a pretty lame homework assignment, must have been a math teacher turned programming teacher. -- Rocky Dean Pulley

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    • D David Crow

      As you are reading in the numbers, if num_elements is a multiple of 100, then call biggest() and smallest(). Another way would be to read all of the numbers in the file, and call the biggest() and smallest() functions once for each group of 100 numbers, like:

      big1 = biggest(table, 100); // search the first 100 numbers
      big2 = biggest(&table[100], 100); // search the second 100 numbers
      big3 = biggest(&table[200], 100); // search the third 100 numbers

      Make sense?


      "Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

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      dr eu
      wrote on last edited by
      #9

      Yes, but how can i write big10489=biggest(&table[1048800], 100); ? This will take a lot of my time. And i don?t now, if file is so long?

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      • R rocky_pulley

        it sounds like he has to for a homework assignment. It sounds like a pretty lame homework assignment, must have been a math teacher turned programming teacher. -- Rocky Dean Pulley

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        dr eu
        wrote on last edited by
        #10

        About homework you have right ! About teacher ... Who nows ? Any way could you help ?

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        • D dr eu

          About homework you have right ! About teacher ... Who nows ? Any way could you help ?

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          rocky_pulley
          wrote on last edited by
          #11

          I can't really do your homework for you, you won't learn anything that way. Besides, you are 90% there, just take the time and figure it out, you're almost done. -- Rocky Dean Pulley

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          • R rocky_pulley

            I can't really do your homework for you, you won't learn anything that way. Besides, you are 90% there, just take the time and figure it out, you're almost done. -- Rocky Dean Pulley

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            dr eu
            wrote on last edited by
            #12

            Yes, from that almost i am gona crazy. The result is O.K. (for all numbers in file). Help me please with 100, 200, ... elements in array !!!

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            • D dr eu

              Yes, but how can i write big10489=biggest(&table[1048800], 100); ? This will take a lot of my time. And i don?t now, if file is so long?

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              David Crow
              wrote on last edited by
              #13

              dr.eu wrote: Yes, but how can i write big10489=biggest(&table[1048800], 100); ? Exactly like that. This assumes that you have read at least 1,048,900 numbers from the file.


              "Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

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              • D dr eu

                Yes, from that almost i am gona crazy. The result is O.K. (for all numbers in file). Help me please with 100, 200, ... elements in array !!!

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                rocky_pulley
                wrote on last edited by
                #14

                just use the same array, once you hit a number where (current_number % 100 == 0) then do your biggest/smallest check and reset current_number to 0, keep going on after that and it will just reuse your 100 item array. -- Rocky Dean Pulley

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                • D David Crow

                  dr.eu wrote: Yes, but how can i write big10489=biggest(&table[1048800], 100); ? Exactly like that. This assumes that you have read at least 1,048,900 numbers from the file.


                  "Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

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                  dr eu
                  wrote on last edited by
                  #15

                  In that case, i have to import another counter j: int j; bigj=biggest(&table[j], 100); Is right so?

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                  • R rocky_pulley

                    just use the same array, once you hit a number where (current_number % 100 == 0) then do your biggest/smallest check and reset current_number to 0, keep going on after that and it will just reuse your 100 item array. -- Rocky Dean Pulley

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                    dr eu
                    wrote on last edited by
                    #16

                    I done so: while (fscanf(in,"%f",&element) != EOF) { table[num_elements] = element; current_number=element; current_number%100==0; num_elements++; } but steel dont work propertly.

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                    • D dr eu

                      I done so: while (fscanf(in,"%f",&element) != EOF) { table[num_elements] = element; current_number=element; current_number%100==0; num_elements++; } but steel dont work propertly.

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                      David Crow
                      wrote on last edited by
                      #17

                      How about:

                      while (...)
                      {
                      table[num_elements] = element;
                      num_elements++;
                      if ((num_elements % 100) == 0)
                      {
                      biggest(...);
                      smallest(...);
                      num_elements = 0;
                      }
                      }


                      "Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

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                      • D David Crow

                        How about:

                        while (...)
                        {
                        table[num_elements] = element;
                        num_elements++;
                        if ((num_elements % 100) == 0)
                        {
                        biggest(...);
                        smallest(...);
                        num_elements = 0;
                        }
                        }


                        "Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

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                        dr eu
                        wrote on last edited by
                        #18

                        I try, but compiler return erors: too few arguments to function `float * biggest(float *, int)' at this point in file too few arguments to function `float * smallest(float *, int)' at this point in file

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                        • D dr eu

                          I try, but compiler return erors: too few arguments to function `float * biggest(float *, int)' at this point in file too few arguments to function `float * smallest(float *, int)' at this point in file

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                          rocky_pulley
                          wrote on last edited by
                          #19

                          I don't mean to sound mean but you should really be able to figure that one out. -- Rocky Dean Pulley

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                          • R rocky_pulley

                            I don't mean to sound mean but you should really be able to figure that one out. -- Rocky Dean Pulley

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                            dr eu
                            wrote on last edited by
                            #20

                            O.K., Thank you anyway for yours great help and good understanding. I'll try to do it well alone, but i'm not sure in access. Thanks again and goodbay !

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