/* Normalize.c
   Reads a file of numbers in ASCII format and prints their normalized
   values to standard output.

   The name of the file should be given as a command line argument.
*/

#include <stdio.h>

void usage();

main(int argc,char **argv){

	float value,maxvalue,minvalue;
	int i;
	FILE* infile;

	if (argc!=2)
		usage();

	if(!(infile=fopen(argv[1],"r"))){
		fprintf(stderr,"Error: Couldn't open input file %s\n",argv[1]);
		exit(1);
	}

	if(fscanf(infile,"%f",&value)!=1){
		fprintf(stderr,"Error: file %s was empty\n",argv[1]); 
		exit(1);
	}


	/* First, we'll scan the whole file to find the min and
	   max values. */

	maxvalue=minvalue=value;

	while(fscanf(infile,"%f",&value)==1){
		maxvalue=(value>maxvalue)?value:maxvalue;
		minvalue=(value>minvalue)?value:minvalue;
	}

	fclose(infile);

	if(!(infile=fopen(argv[1],"r"))){
		fprintf(stderr,"Error: Couldn't re-open input file %s\n",argv[1]);
		exit(1);
	}

	range=max-min;
	
	while(fscanf(infile,"%f",&value)==1){
		printf("%f\n",fabs((value-min)/range));
	}

	fclose(infile);
}