utils.c

比较完整的遗传算法的源代码

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

#include "utils.h"

void strcreate(char **dest, char *src) {
  *dest = (char *)malloc(sizeof(char) * strlen(src) + 1);
  if (!*dest) {
    syserror("strcreate");
  }
  strcpy(*dest, src);
}

int flip(double prob) {
  if (prob == 1.0) {
    return 1;
  } else {
    return ( randFraction() <= prob);
  }
}

double randFraction(void) {
  return (random() / (RAND_MAX + 1.0));
}

int randInt(int l, int h) {
  if (l < h) {
    return l + (int)(randFraction() * (double)(h - l + 1));
  } else {
    return h + (int)(randFraction() * (double)(l - h + 1));
  }
}

extern char *appName;

void syserror(char *loc) {
  char errorbuffer[128];

  sprintf(errorbuffer, "%s, %s", appName, loc);
  perror(errorbuffer);
  exit(EXIT_FAILURE);
}

void error(char *loc, char *message) {
  fprintf(stderr, "%s, %s: %s\n", appName, loc, message);
  exit(EXIT_FAILURE);
}

#ifdef USE_PVM

#include <pvm3.h>

void pvmerror(char *loc) {
  char errorbuffer[128];

  sprintf(errorbuffer, "%s, %s", appName, loc);
  pvm_perror(errorbuffer);
  exit(EXIT_FAILURE);
}

#endif /* USE_PVM */