c 언어 랜덤 정수 추출 실현

#include 
#include 
#include
#include

void swap2(int *,int *);
void bubble(int storenumber[ ],int n);

int storenumber[100000]={0};  /*the max number of sampling is 100000*/

int main()
{
	FILE *f1;

	double p;
	int h,k,i;
	int N,Nsample,number;
	char anything;
    srand((unsigned)time(NULL));
    printf("Enter the total number:
");
    scanf("%d",&N);
    printf("Enter the sampling size:
");
    scanf("%d",&Nsample);


    for(h=1;h<=Nsample;h++){
        p=rand()/(double)(RAND_MAX);
        number=(int)(p*N)+1;
        for(k=1;k<=h;k++){         /*remove the duplicate number*/
            if(number==storenumber[k]){
                p=rand()/(double)(RAND_MAX);
                number=(int)(p*N)+1;
                k=0;
            }
        }

        storenumber[h]=number;
    }

    printf("
 MAKE A FORTUNE, LEO!!!

");

    bubble(storenumber,Nsample);   /*for the numeric sorting*/


    if((f1=fopen("d:\\sampling_number.txt","w"))==NULL){
        printf("file open error!
");
        exit(0);
    }

    for(i=1;i<=Nsample;i++){
        fprintf(f1,"%d
",storenumber[i]);
        printf("The %d sample is %d
",i,storenumber[i]);
    }

    if(fclose(f1)){
        printf("can not close the file!
");
        exit(0);
    }

    printf("
 ATTENTION:
 The file is saved in 'D:\\sampling_number.txt' 
");
    printf("
 Type any character on keyboard,  then 'Enter'");
    scanf("%s",&anything);

    return 0;
}


void bubble(int storenumber[ ],int n)         /*for the numeric sorting*/
{
    int i,j;
    for(i=1;i<=n;i++){
        for(j=1;j<=n-i;j++){
            if(storenumber[j]>storenumber[j+1]){
                swap2(&storenumber[j],&storenumber[j+1]);
            }
        }
    }
}

void swap2(int *px,int *py)
{
    int t;
    t=*px;
    *px=*py;
    *py=t;
}