data_input.c

C语言版本的蚁群系统算法

/*
      ANT-CYCLE ALGORITHM FOR TSP
      File:    data_input.c
      Author:  ehui928
      Purpose: implementation of data_input.h
      Date:		2007-01-18
*/
#include <stdio.h>
#include <stdlib.h>
#include "data_input.h"
#include "tsp.h"


void read_data(char *filename, Point *p)
{
    /*
		read city corordinates
		i,x, y refers to each record in 
		input file----(city_num, coordinate1,coordinate2) 
	*/

    int i;
    double x, y;
    int n;
    FILE *fp;

    if ( (fp = fopen(filename, "r")) == NULL)
    {
        fprintf(stderr, "can not open file %s\n", filename);
        exit(1);
    }


    n = 1;

    while (n < CITY_NUM+1)
    {
		/* 
			since x, y all double numbers, so here the
			format must be %lf , not %f, otherwise data reading will be error
		*/
        fscanf(fp, "%d %lf %lf", &i, &x, &y);
        p[i].x = x;
        p[i].y = y;
        n++;
    }
    fclose(fp);
}

/* function to test if data has been read correctly */
void print_coordinates(Point *p)
{
    int i;
    printf("Cities Coordinates:\n");
    for (i = 1; i < CITY_NUM+1; i++)
        printf("%d	%f	%f\n", i, p[i].x, p[i].y);
}