how to print a file on the screen

I am having trouble bring information from a file into a structure and printing it out on the screen. How is that done? Here is the code I have that has the structure and the open statement. But not sure how to pull the data from the file and print it out.. Is that a plain printf statement?

Code:

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#include <stdio.h>
  #include <stdlib.h>
    int  num_comp;          /*place holder for number of companies */
    float  num_months;      /*place holder for number of months */


  struct company{    /*structure to hold the file of company.txt*/
      char city[30];
      float months[10];
      char name[20];
      char manager[20];
    };

    struct company *comp;  /*create structure pointer */

  int main(int argc, char **argv){

      FILE *fp;

      char filename[20];
      int choice, sum, counter;
      double average;
      float month;
    comp = (struct company *)malloc(sizeof(struct company));

      printf("Please enter the name of the relevant file:  ");
      scanf("%s", &filename);
      fp = fopen("filename", "r");  /*to open a current file*/
      fscanf(fp, "%s", &filename);

      printf("1. Enter 1 to get the statistics for a specific month.\n");
      printf("2. Enter 2 to get the overall statistics.\n");
      printf("3. Enter 3 to terminate the program.\n");
        printf("Please enter your choice:\n" );
      scanf("%d", &choice);

      switch(choice){
          case 1:
          printf("Which month are you interested in?");
          scanf("%f", &month);
          if (month > 4)
          printf("Sorry, this data is not available, please enter a valid integer from 1 to 4\n");

          else

          for (counter =1; counter <= 19; counter=counter++)
          {
          average = sum/counter;
          }
          printf("Average sale for month %d: %f \n", month, average);

          break;
          case 2:
          case 2:
          printf("The statistics are below: %s\n ", filename);

          break;
          case 3:
          printf("Good Bye!\n");
          break;
          default:
          break;

        fclose(fp);
        }
      return 0;
}

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Don't cast malloc.

Code:

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fp = fopen("filename", "r");

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You should check to see if open failed (if it failed, fp will be NULL).

Code:

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counter=counter++

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All you need is counter++ here. Your code is the same as

Code:

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counter = counter + 1;  /* or counter++ or ++counter */
counter = counter;

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Your fclose(fp) is unreachable. It will never execute.

Why won't it execute?

If you'd indent properly, maybe you'd see . . .

Code:

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switch(choice){
      case 2:
          case 2:  // duplicate case: should be an error
          printf("The statistics are below: %s\n ", filename);

          break;
      case 3:
          printf("Good Bye!\n");
          break;
      default:
          break;

        fclose(fp);
    }

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There's a break before the fclose(). It will never execute.

Also note the duplicate case.