Question

to read strings from a file and print the sorted output using qsort. So I write something like this:

int main()
{
  int n=0;
  int size=1;
  File *fp = fopen(args[0],"r");
  int c;
  char* inputFile;
  inputFile = char* malloc(size);
  if(fp==0){
    fprintf(stderr, "Cannot open file!\n");
    return -1;
  else{
    do{
      c = fgetc(fp);
      if(size==1){
        inputFile[n]=c;
      }
      else{
        inputFile = char* realloc(inputFile, size+1);
        inputFile[n]=c;
      }
      n++;
      size++;
  }while(c!=EOF);
  qsort(inputFile, 1, size, compare);//I have implement the compare function correctly
  n=0;
  while(n<size){
    while(input[n]!='\0'){
       printf ("%d ",inputFile[n]);
       n++;
    }
    n++;
  }
  return 0;
}

So, if the input file is ‘\0vaaa\n\0ba\0\nabc’, the program should output print:

abc
ba
vaaa

However, my code isn’t working at all. I have check that the compare method return the correct result. Additionally, I just wonder if I implement the malloc-realloc correctly? Thx

Answer 1

You want to print strings, so replace:

printf ("%d ",inputFile[n]);

with

printf ("%s ",inputFile[n]);

But you may have other problems in your code..