Sample Solution
Comp 110 Practice Problems for Final Exam




1)Write the following 'while' loop using 'for' loop

int count = 0;
int sum = 0;
while( count < 10 ) {
   sum += count;
   count++;
}

********************************************************
int sum = 0;
for(int count = 0; count < 10; count++ )
   sum += count;


2) What is the output from each code segment?

a) 

int sum = 0;
for( int i = 0; i < 5; i++ ) {
   sum = sum + i;
   for( int j = 0; j < 5; j++ )
      sum = sum + j;
   }
System.out.println(sum);

********************************************************
ques2b: sum = 50

b) 

int sum = 0;
for( int i = 0; i < 5; i++ ) {
   sum = sum + i;
   for( int j = i; j < 5; j++ )
      sum = sum + j;
   }
System.out.println(sum);

********************************************************
ques2b: sum = 50

3) Display the first num numbers in the Fibonacci sequence.
The sequence starts with the following numbers:

1,1,2,3,5,8,12,21

After the initial two 1s, each number in the sequence 
is the sum of the two prvious numbers.
You may assume num >= 2

	
public static void fibonacci(int num) {
   // Your code goes here
}


********************************************************
	public static void fibonacci(int num) {
		System.out.print("1,1");
		int first = 1;
		int second = 1;
		int index = 3;
		while(index <= num) {
			int nextNumber = first + second;
			System.out.print("," + nextNumber);
			first = second;
			second = nextNumber;
			index++;
		}
		System.out.println();
	}


4) Read a sequence of positive numbers from the keyboard.
Display first the largest and then smallest number entered.
Entering a negative number signals the end of the input.
For example, the input sequence

13
12
66
91
-999

produces the output

12 91


********************************************************
	public static void ques4() {
		Scanner inp = new Scanner(System.in);
		int largest = -1;
		int smallest = 99999999;
		System.out.println("enter next number: " );
		int nextNumber = inp.nextInt();
		while(nextNumber >0 ) {
			if(nextNumber > largest) largest = nextNumber;
			else if(nextNumber < smallest) smallest = nextNumber;
			System.out.println("enter next number: " );
			nextNumber = inp.nextInt();
		}
		System.out.println("smallest = " + smallest + " largest = " + largest);		
	}