#52_140827_JAVA_LOOP

# LOOP

 

l while loop 문

 

1.     loop 문의 3가지 조건

- 변수 선언

- 반복 조건

- 반복 조건을 무너뜨릴 조건

 

 

 

 

 

 

l For …. loop 문

 

 

 

구구단
public static void main(String[] args) {          for(int num1=1; num1<10;num1++)          {                   for(int num2=1; num2<10;num2++)                   {                            System.out.println(num1+" * "+num2+" ="+num1*num2);                       }          } }
결과값	1 * 1 =1 1 * 2 =2 1 * 3 =3 1 * 4 =4 1 * 5 =5 1 * 6 =6 ………………………..

 

 

 

 

l 중첩 loop 문

 

 

구구단
public static void main(String[] args) {          for(int num1=1; num1<10;num1++)          {                   for(int num2=2; num2<10;num2++)                   {                            System.out.print(num2+" * "+num1+" ="+num1*num2+"    ");                     }          System.out.println("");          } }
결과값	2 * 1 =2    3 * 1 =3    4 * 1 =4    5 * 1 =5    6 * 1 =6    7 * 1 =7    8 * 1 =8    9 * 1 =9    2 * 2 =4    3 * 2 =6    4 * 2 =8    5 * 2 =10    6 * 2 =12    7 * 2 =14    8 * 2 =16    9 * 2 =18    2 * 3 =6    3 * 3 =9    4 * 3 =12    5 * 3 =15    6 * 3 =18    7 * 3 =21    8 * 3 =24    9 * 3 =27    2 * 4 =8    3 * 4 =12    4 * 4 =16    5 * 4 =20    6 * 4 =24    7 * 4 =28    8 * 4 =32    9 * 4 =36    2 * 5 =10    3 * 5 =15    4 * 5 =20    5 * 5 =25    6 * 5 =30    7 * 5 =35    8 * 5 =40    9 * 5 =45 ………………………..

 

 

 

 

 

l Break문과 continue문

 

 

 

Break
public static void main(String[] args) {       int num=1;       boolean search=false;             while(num<100)       {             if(num%5==0 && num%7==0)             {                   search=true;                   break;             }             num++;       }             if(search)             System.out.println("찾는 정수 : " + num);       else             System.out.println("5의 배수이자 7의 배수를 찾지 못했습니다."); }
결과값	찾는 정수 : 35

 

 

 

Continue
public static void main(String[] args) {       int num=0;       int count=0;             while((num++)<100)   // 0 부터 시작해서 100 보다 작을때까지 loop 를 돌리는데       {             if(num%5!=0 || num%7!=0)  // 5의 배수가 아니거나 7의 배수가 아니라면                   continue;        // 즉 35 거나 100 이 아니라면 지속해라                         count++;               System.out.println(num);       }   System.out.println("count: " + count); }
결과값	35 70 count: 2

 

 

 

숫자를 입력받고 입력한 숫자까지 출력(while break 활용)
public static void main(String[] args) {     System.out.print("숫자를 입력하시오 ? ");     Scanner sc=new Scanner(System.in);      float input_num1=sc.nextFloat();     int num=1;           while(true)       {             System.out.println(num);             if(num==input_num1)             {                   break;             }             num++;       }   }
결과값	숫자를 입력하시오 ? 10 1 2 3 4 5 6 7 8 9 10