Control Statements Excercises

  
1)

  
2)



  
3)

  
4)



  
5)

  
6)



  
7)

  
8)



  
9)

  
10)



  
11)

  






Excercises

12)	a do-while loop

13)	a while loop with a nested if-then branch

14)	an if-then-else branch with a nested if-then-else-branch

15)	an if-then branch with a nested while loop

16)	a do-while loop with a nested do-while loop

17)	an if-then-else branch with a nested do-while loop

18)	an if-then branch with a nested if-then branch

19)	a while loop with a nested while loop

20)	a do-while loop with a nested if-then-esle branch

Excercises



If Statements

21)  if (i > 50)
         System.out.println("yes");

22)  if ((i > 20) && (i < 40))
         System.out.println("yes");
     
23)  if (i > 70)
         System.out.println("yes");
     else
         System.out.println("no");

24)  if (i >= 20)
         System.out.println("cool");
     if (j < i)
         System.out.println("uncool");

25)  if (i % j == 0)
         System.out.println("yes");
     else
         System.out.println("no");
     if (j % i)
         System.out.println("cool");
     else
         System.out.println("uncool");

26)  if ((i % 2 == 0) && (j % 2 == 0)) {
         System.out.println("case1");
     } else if ((i % 2 == 0) && (j % 2 == 1)) {
         System.out.println("case2");
     } else if ((i % 2 == 1) && (j % 2 == 0)) {
         System.out.println("case3");
     } else if ((i % 2 == 1) && (j % 2 == 1)) {
         System.out.println("case4");
     }
     
27)  if (i % 2 == 0) {
         if (j % 2 == 0)
             System.out.println("case1");
        else
             System.out.println("case2");
     } else {
         if (j % 2 == 0)
             System.out.println("case3");
         else
             System.out.println("case4");
     }

28)  if (i == 1) {
         System.out.println("2");
     } else if (i == 2) {
         System.out.println("4");
     } else if (i == 3) {
         System.out.println("6");
     } else if (i == 4) {
         System.out.println("8");
     }

29)  if (i == 1) {
         System.out.println("2");
     } else if (i == 2) {
         System.out.println("4");
     } else if (i == 3) {
         System.out.println("6");
     } else if (i == 4) {
         System.out.println("8");
     } else {
         System.out.println(i);
     }

30)  if ((i >= 1) && (i <= 4))
         System.out.println((2*i));
     else
         System.out.println(i);

31)  if (p)
         System.out.println("yes");
     else {
         if (i < j)
             System.out.println("yes");
         else
             System.out.println("no");
     }

32)  if (p)
         System.out.println("yes");
     else {
         if (q)
             System.out.println("yes");
         else
             System.out.println("no");
     }

33)  if (q) {
         if (p)
             System.out.println("no");
         else
             System.out.println("yes");
     } else
         System.out.println("no");

34)  if (q)
         System.out.println("yes");
     else {
         if (r)
             System.out.println("no");
         else
             System.out.println("yes");
     }

35)  if  (p) {
         if (q)
             System.out.println("a");
         else {
             if (r)
                 System.out.println("b");
             else
                 System.out.println("c");
         }
     } else {
         if (r)
             System.out.println("d");
         else
             System.out.println("e");
     }

36)  if  (p) {
         if (q) {
             if (r) 
                 System.out.println("odd");
             else
                 System.out.println("even");
         } else {
             if (r)
                 System.out.println("even");
             else
                 System.out.println("odd");
         }
     } else {
         if (q) {
             if (r)
                 System.out.println("even");
             else
                 System.out.println("odd");
         } else {
             if (r)
                 System.out.println("odd");
             else
                 System.out.println("even");
         }
     }

37)  if  (q) {
         if (p)
             System.out.println("c");
         else {
             if (r)
                 System.out.println("e");
             else {
                 System.out.println("d");
         }
     } else {
         if ()
             System.out.println("c");
         else {
             if ()
                 System.out.println("e");
             else {
                 System.out.println("d");
         }
     }

38)  if (p == q)
         System.out.println("yes");
     else {
         System.out.println("no");

39)  if (p == q)
         System.out.println("no");
     else {
         System.out.println("yes");


40)  System.out.println("yes");

Excercises

Switch Statements 

41)  switch (flavor) {
         case MINT_CHIP:
             System.out.println("yipee");
             break;
         case STRAWBERRY:
             System.out.println("woo hoo");
             break;
         case COOKIE_DOUGH:
             System.out.println("all right");
             break;
     }

42)  switch (flavor) {
        case MINT_CHIP:
        case CHOCLOATE:
             System.out.println("yipee");
     }

43)  switch (flavor) {
         case CHOCOLATE:
         case VANILLA:
         case STRAWBERRY:
         case MINT_CHIP:
         case COOKIE_DOUGH:
             break;
         default:
             System.out.println("hey, no fair");
     }

44)  switch (flavor) {
         case VANILLA:
             System.out.println("score");
         case MINT_CHIP:
             System.out.println("yipee");
             break;
         case STRAWBERRY:
             System.out.println("woo hoo");
             break;
         case COOKIE_DOUGH:
             System.out.println("all right");
             break;
         default:
             System.out.println("darn");
     }

45)  switch (i) {
         case 1:
             System.out.println("a");
             break;
         case 2:
             System.out.println("b");
             break;
         case 3:
             System.out.println("c");
             break;
         case 4:
             System.out.println("d");
             break;
         case 4:
      }

46)  switch (i) {
         case 1:
             System.out.println("l");
             break;
         case 2:
             System.out.println("m");
             break;
         case 3:
         case 4:
             System.out.println("n");
             break;
         case 5:
             System.out.println("o");
             break;
      }

47)  switch (i) {
         case 1:
             System.out.println("a");
             break;
         case 2:
         case 3:
             System.out.println("b");
             break;
         case 4:
             System.out.println("c");
         case 5:
             System.out.println("d");
         default:
             System.out.println("f");
      }

48)  switch (i) {
         case 3:
         case 4:
             System.out.println("c");
         case 2:
             System.out.println("b");
             break;
         case 1:
             System.out.println("a");
             break;
         case 5:
             System.out.println("d");
         default:
             System.out.println("f");
      }


49)  switch (i) {
         case 6:
             System.out.println("d");
             break;
         case 3:
         case 4:
             System.out.println("b");
         case 2:
             System.out.println("a");
             break;
         case 1:
         case 5:
             System.out.println("c");
         default:
             System.out.println("f");
      }

50)  switch (i) {
         case 1:
         case 2:
         case 3:
         case 4:
             System.out.println((2*i));
             break((2*i));
         default:
             System.out.println(i);
     }

Excercises

While and Do While


51)  i = 1;	// priming read
     while (i <= 5) {
         System.out.print("*");
         i += 1;
     }

52)  i = 1;	// priming read
     do {
         System.out.print("*");
         i += 1;
     } while (i <= 5);

53)  10

54)  9

55)  10

56)  11

57)  10

58)  100

59)  99

60)  45

61)  

i = 5;
while (i > 0) {
    j = i;
    while (j > 0) {
        System.out.print("*");
        --j;
    }
    --i;
    System.out.println();
}
    or    

i = 5;
do {
    j = i;
    do {
        System.out.print("*");
       --j;
    } while (j > 0);
    --i;
    System.out.println();
} while (i > 0);


62)  i = 5;
     while (i > 0) {
         j = 5 - i;
         while (j  > 0) {
            System.out.print(" ");
             --j;
         }
         k = i;
         while (k > 0) {
             System.out.print("*");
             --k;
        }
        --i;
        System.out.println();
     }

     no. you will run into trouble on the first line becaue you will have to
     print at least one space before the stars. However, you can do most of
     it as follows.

     i = 5;
     do {
         j = 5 - i;
         while (j  > 0) {
            System.out.print(" ");
             --j;
         }
         k = i;
         do {
             System.out.print("*");
             --k;
        } while (k > 0);
        --i;
        System.out.println();
     } while (i > 0);

63)

64)	

65)	* * * * * *
	 * * * * *
	* * * * * *
	 * * * * *
	* * * * * *
	 * * * * *
	* * * * * *
	 * * * * *
	* * * * * *