java Learning Series 3-- flow control statements

1. Sequence Structure

int a = 18;
if(a < 60){
　　return 'D'; 
}else if(a<70){
　　return 'C';
}else if(a<80){
　　return 'B';
}else{
　　return 'A';
}

2. Select structure

int week = 2;
switch (week){
    case 1:
        System.out.println("Monday"); 
        break;
    case 2:
        System.out.println("Tuesday");
        break;
    case 3:
        System.out.println("Wendesday");
        break;
    default:
        System.out.println("sorry, i dont know");
}

3. loop structure

A 0 = int; 
the while (A <0) { 
    System.out.println (A); 
    A ++; 
} 
System.out.println ( "-----------"); 
// do the while and -while the difference will ensure the do-while loop is executed at least once 
a = 0; 
do { 
    System.out.println (a); 
    a ++; 
} the while (a <0);

//for循环
for (a = 0; a < 0; a++){
    System.out.println(a);
    a++;
}

4. Jump

// Requirement 1: 0-100 generates a random number generated until 88, the circulation was stopped 
int Total = 0 ; 
System.out.println ( "the Begin!" );
 The while ( to true ) { 
    Total ++ ;
     int I = ( int ) Math.round (100 * Math.random ());
     IF (I == 88 )
         BREAK ; 
} 
System.out.println ( "Game over, Used" Total + + "Times." ); 
System.out.println ( "------------" );
 // Requirement 2: output 100 to 150 can not be divisible 3 
for ( int I = 100; I <150; I ++ ) {
    if (i % 3 == 0)
        continue;
    System.out.println(i);
}

5. Multi-cycle

outer: for (int i = 101; i < 150; i++){
  inner:  for (int j = 2; j < i / 2; j++){
        if (i % j == 0){
            continue inner;
        }
        System.out.println(i + " " + j);
    }