#include "stdio.h"
#include "stdlib.h"
#define RANDOM_MAX 2147483647
#define MAX 100
//#define MAX 10

int prob(double x);

int main ()
{
　//double mu = 0.0009/1000;
　double mu = 0.0009/10;
　int i;

　for(i=0; i < MAX; i++){
　  printf("%d:", i);
　  if(prob(mu) == 1) printf("1\n");
　  else printf("0\n");
  }

  return 0;
}

int prob(double x)
{
　double r;
　
　random(); // 念のため一度フラッシュ．
　r=random()/(RANDOM_MAX+1.0); // 「+1」だとマイナスの値になる．「2 の補数」．
　//printf("random: %ld\t", random());
　//printf("r:%e | ", r);

　if (r < x) return 1;

　return 0;
  }
}

[i2:1spp]$ gcc -Wall mut.c
[i2:1spp]$ ./a.out
0:0
1:0
2:0
...
21:0
22:1
23:0
...
98:0
99:0
[i2:1spp]$

#include "stdio.h"
#include "stdlib.h"

#define NOTHING -1

struct chromosome
{
  int name;
  int *genes;
  int length;
  struct chromosome *next_chromosome;
} *first_chromosome;

int chr_num = 5;
int gene_len = 3;
struct chromosome *new_chromosome(int chrN, int len)
{
  struct chromosome *chp;
  int i;
  
  if (chrN<0)
  {
    fprintf(stderr,"Negative chrN\n");
    exit(1);
  }
  
  if (len<0)
  {
    fprintf(stderr,"Negative length\n");
    exit(1);
  }
  
  chp = (struct chromosome*)malloc(sizeof(struct chromosome));
  if (chp==(struct chromosome*)NULL)
  {
    fprintf(stderr,
            "Could not allocate memory for new chromosome\n");
    exit(1);
  }
  
  chp->genes = (int*)malloc(sizeof(int)*(len+1));
  if (chp->genes==NULL)
  {
    fprintf(stderr,
            "Could not allocate memory for new chromosome's genes\n");
    exit(1);
  }
  for (i=0; i<=len; i++) chp->genes[i] = i;
  
  chp->name = chrN;
  chp->length = len;
  
  if (first_chromosome == (struct chromosome*)NULL)
  {
    chp->next_chromosome = (struct chromosome*)NULL;
  }
  else
  {
    chp->next_chromosome = first_chromosome;
  }
  first_chromosome = chp;
  
  return chp;
}

int main()
{
  struct chromosome *chp;
  int i;
  
  for (i=0; i< chr_num; i++)
  {
  new_chromosome(i, gene_len);
  }
  
  // PRINTOUT
  for (chp=first_chromosome;
  chp!=(struct chromosome*)NULL;
  chp=chp->next_chromosome)
  {
    printf("Chr%d; length:%d \n", chp->name, chp->length);
    for (i=0; i < gene_len; i++)
      printf(" genes[%d]:%d\n", i, chp->genes[i]);
  }
  
  return 0;
}

[i2:1spp]$ gcc chromosome.c
[i2:1spp]$ ./a.out
Chr4; length:3
genes[0]:0
genes[1]:1
genes[2]:2
Chr3; length:3
genes[0]:0