/* This is the selection operator for the roulette wheel selection */void roulette(population *old_pop_ptr,population *mate_pop_ptr);void roulette(population *old_pop_ptr,population *mate_pop_ptr){  int i,j,k,r,*gene1,*gene2,maxrank;  float sum,c,cumprob[maxpop],rnd,*fit;   /*Find Sum of the fitness*/  sum = 0;    for (i = 0;i < popsize;i++)    {       old_pop_ptr->ind_ptr = &(old_pop_ptr->ind[i]);      fit = &(old_pop_ptr->ind_ptr->dumfit);      r = old_pop_ptr->ind_ptr->rank;      sum = sum +  *fit*1000*(popsize-r);    }  c = 0;  /*Finding the cumulative probability for the different individuals*/  for(i = 0;i < popsize;i++)    {      old_pop_ptr->ind_ptr = &(old_pop_ptr->ind[i]);            fit = &(old_pop_ptr->ind_ptr->dumfit);            r = old_pop_ptr->ind_ptr->rank;            c = c +  *fit*1000*(popsize-r) ;            cumprob[i] = c/sum ;          }    for(i = 0;i < popsize;i++)   {     rnd = randomperc();     j = 0;          /*Generate a Random No to find which individual to select*/          while(rnd > cumprob[j])       {	 j++;       }          old_pop_ptr->ind_ptr = &(old_pop_ptr->ind[j]);     mate_pop_ptr->ind_ptr = &(mate_pop_ptr->ind[i]);          if(optype != 3)       {	 gene1 = &(old_pop_ptr->ind_ptr->genes[0]);	 	 gene2 = &(mate_pop_ptr->ind_ptr->genes[0]);	 	 for(k = 0;k < chrom;k++)	   *gene2++ = *gene1++;	        }     else       {	 for(k = 0;k < chrom;k++)	   mate_pop_ptr->ind_ptr->gener[k] = old_pop_ptr->ind_ptr->gener[k];       }     for(k = 0;k < nvar;k++)       mate_pop_ptr->ind_ptr->xreal[k] = old_pop_ptr->ind_ptr->xreal[k];   }  return;}