lotto3.c(로또번호 추첨-100만번 섞기)

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

int main(void)
{
	int balls[45];
	for (int i = 0; i<45; i++){
		balls[i] = i+1;
	}
	
	srand(time(NULL));
	for (int i = 1; i<=1000000; i++){
		int index1;
		int index2;
		while(1){
			index1 = rand()%45;
			index2 = rand()%45;
			if (index1 != index2){
				break;
			}
		}
		int temp = balls[index1];
		balls[index1] = balls[index2];
		balls[index2] = temp;
	}
	
	for (int i = 0; i<7; i++){
		printf("%d ",balls[i]);
	}
	printf("\n");
	return 0;
}