java/코드 리뷰

4. control - (3) Lotto3 (로또 중복발생 방지)

Astaroth아스 2020. 3. 23. 15:03
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package control;
 
public class Lotto3 {
    public static void main(String[] args) {
        int n1 = 0;
        int n2 = 0;
        int n3 = 0;
        int n4 = 0;
        int n5 = 0;
        int n6 = 0;
        
        int num = 0;
        
        for(int i=1; i<=6; i++) {
            num = (int) (Math.random() * 45 + 1);
            
            if (num == n1 || num == n2 || num == n3 || num == n4 || num == n5 || num == n6 ) {
                // num이 n1과 일치하거나....n6과 일치하거나(OR)
                // 지금 발행된 숫자와 동일한 숫자가 이미 존재하고 있음
                i--; // 안쓰면 i가 + 되버림
                // if문 나가서 다시 for문에서 + 되서 다시 if문으로 돌아옴
            } else {
                // 지금 발행된 숫자와 동일한 숫자가 존재하지 않음
                // i의 값에 따라서 적절한 변수에 지금 발행된 난수를 저장
                if (i==1) {
                    n1 = num;
                } else if (i==2) {
                    n2 = num;
                } else if (i==3) {
                    n3 = num;
                } else if (i==4) {
                    n4 = num;
                } else if (i==5) {
                    n5 = num;
                } else if (i==6) {
                    n6 = num;
                }
            }
            
        }
        
    }
}