Thread: MAC C Scanning text documents, merge and summing lines

Hey all. I'm new to the forum and the programming world. I have a uni project where I have to open a text file, grab certain lines from the file, mainly a column with names and a column with numbers. Any duplicate names are to be removed and their corresponding values be summed into one.

I've developed the main structure I believe it's structured right?
But alas I'm really just looking for some guidance on how structure the bit that organises the columns and condenses them down. I'm not seeking a solution but just not sure how to tackle it. Where I need to implement the code is near the while fscanf bit.

Thanks!

Code:

#include < stdio.h > #include < stdbool.h > #include < stdlib.h > #include < string.h >

  // Initialise all characters
  char macsend;
char macreceive;
float time1 = 0;
int byte[500][20];

//Load in input arguments
int main(int argc, char * argv[]) {
  char * loc;
  loc = argv[2];

  char * meth = argv[1];

  //Open and load the input text file.
  FILE * inputfile = fopen(loc, "r");
  if (inputfile == NULL) {
    printf("\nFailed to open the file!.\n");
    exit(1);
  }

  //Create the output file.
  FILE * output = fopen("./output.txt", "w");

  // If its a transmit request, we only need &macsend and &byte.
  if ( * meth == 't') {

    while (fscanf(inputfile, "%f\t%s\t%s\t%d", & time1, & macsend, & macreceive, & byte) != EOF)
      printf("\nSuccess Te! \t %d", byte);

    fclose(inputfile);
    fclose(output);

    exit(EXIT_SUCCESS);
  }

  // If its a receive request, we only need &macreceive and &byte.
  else if ( * meth == 'r') {

    char transmission[]
    while (fscanf(inputfile, "%f\t%s\t%s\t%d", & time1, & macsend, & macreceive, & byte) != EOF)
      printf("Success R!\n");

    fclose(inputfile);
    fclose(output);

    exit(EXIT_SUCCESS);
  }

  // If t or r is not used, print error.
  else {
    printf("Please use r or t for transmission!\n");
    exit(EXIT_FAILURE);
  }
}

So I guess, where I get confused (due to my lack of understanding) is should I be using fscanf to open up the file and isolate each column? So say I specifically want to use the macsend column and the bytes column, and I want to merge any duplicate macsend names, but then in the corresponding bytes column, the integers are summed. So say, KEVIN 3, JOHN 7, KEVIN 6, JOHN 6. And then in the new text file, KEVIN 9, JOHN 13.
If I am using fscanf, is there a specific way I can make the program search through all the macsend lines and merge them? Could I somehow use the strstr() function to do this?
Cheers