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

Read file, write to array, find min and max

Scheduled Pinned Locked Moved C / C++ / MFC
data-structureshelp
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  • D dr eu

    //This program read file *.txt, than 100 float numbers(or int numbers, if they are present) //write in a float array.Next, finds MIN and MAX element in float array with using pointers, //write results on the screan and if there is no more numbers, go to end, else repet all again. #include #include #include #define MAXELEMENTS 100 // MAX numbers of elements //funkcion for max element in float array float *biggest(float table[],int number) { int counter, counter_max; float aretheysame=0; for(counter=0; counter < number; counter++) { if (*(table+counter) > aretheysame) { aretheysame = *(table+counter); counter_max = counter; } } return(&*(table+counter_max)); } //finkcion for min element in float array float *smallest(float table[],int number) { int counter, counter_max=0; float aretheysame=table[0]; for(counter=0; counter < number; counter++) { if (*(table+counter) < aretheysame) { aretheysame = *(table+counter); counter_max = counter; } } return(&*(table+counter_max)); } main(void) { FILE *in; char inter[255]; int num_elements=0; float element; static float table[MAXELEMENTS]; float *small,*big; printf("Adress and value of max and min element in array\n"); printf("Enter file name : "); gets(inter); in= fopen(inter,"r"); if(in == NULL) { printf("Error. No file with this name\n"); exit(1); } while (fscanf(in,"%f",&element) != EOF) { table[num_elements] = element; num_elements++; } if (num_elements > 1) { big=biggest(table,num_elements); printf("\nThe adress of max element is %d",&*big); printf(", with value %f",*big); small=smallest(table,num_elements); printf("\nThe adress of min element is %d",&*small); printf(", with value %f",*small); } else { ; } fclose (in); getchar(); } And *.txt file: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 -10 -9 -8 -7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 2000 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75

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    Mattias G
    wrote on last edited by
    #7

    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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    • 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 !!!

              R 1 Reply Last reply
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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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                D Offline
                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

                        D 1 Reply Last reply
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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

                            D 1 Reply Last reply
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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

                              D Offline
                              D Offline
                              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 !

                              1 Reply Last reply
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