Decision Control Structure

The Selection statements cause the program control to be transferred to a specific location depending upon the outcome of the conditional expression.

The Step value determines the increment or decrement of the loop control variable unless the test condition becomes false.

Java provides three basic looping control structures.

The for loop is also called an Entry controlled loop.

The do while first executes the block of statements and then checks the condition.

The order in which statements are executed in a running program is called the Flow of control.

The break statement takes the flow of control out of the switch statement.
True

To execute the while loop, the condition must be false in the beginning.
False

Default is the first statement of the switch case.
False

While writing programs, the statements should be indented properly for better readability.
True

The number of iteration refers to the number of times the condition is met.
True

Radhika is writing a program in Java to print her name 10 times. Suggest her the appropriate condition for the same.

Naina has written a program in which she has entered one number. She wants to check whether the entered number is divisible by 2 or not. Suggest her the appropriate condition for the same.

The .......... is a logical situation where either of the two actions are to be performed depending on certain condition.

Name the expression that is used to initialize a loop variable.

The unusual execution of more than one case at a time is termed as

How many times the following body of loop will execute?

for(int a = 1; a <= 10; a++)
{
System.out.println(a);
}

How many times the following message will be printed?

do
{
System.out.println("Hello");
}
ch++;
while(ch <= 1);

If none of the case matches, the compiler executes the statements written in the .......... case.

Which control structure is used when there is a requirement to check multiple conditions in a program?

Explain the use of if control structure.

What are the unique features of for loop?

Explain the switch statement with an example.

What is the importance of break and default statements in switch?

Give one difference between while and do while loop.

Write a program in Java using for loop to print all the odd and even number upto 30 terms.

public class KboatEvenOdd
{
    public static void main(String args[]) {
        System.out.println("Odd numbers: ");
        for (int i = 1; i <= 60; i += 2) {
            System.out.print(i + " ");
        }
        
        System.out.println();
        System.out.println("Even numbers: ");
        for (int i = 2; i <= 60; i += 2) {
            System.out.print(i + " ");
        }
    }
}

Write a program to print all the factors of 20.

public class KboatFactors
{
    public static void main(String args[]) {
        int n = 20;
        System.out.println("Factors of 20 are:");
        for (int i = 1; i <= n; i++) {
            if (n % i == 0)
                System.out.println(i);
        }
    }
}

Write a program using while loop to generate the first 10 natural numbers and their sum.

public class KboatNaturalNumbers
{
    public static void main(String args[]) {
        int n = 1;
        int sum = 0;
        while (n <= 10) {
            System.out.println(n);
            sum = sum + n;
            n = n + 1;
        }
        System.out.println("Sum = " + sum);
    }
}

Program to check whether the product of two numbers is a buzz number or not.
[A number that ends with 7 or is divisible by 7, is called a buzz number]

public class KboatBuzzCheck
{
    public static void buzzNumCheck(int a, int b) {
        int p =  a * b;
        System.out.println("Product = " + p);
        if (p % 10 == 7 || p % 7 == 0)
            System.out.println("Product is a Buzz Number");
        else
            System.out.println("Product is not a Buzz Number");
    }
}

Generate the following series upto 10 terms:

a) 1, 8, 27, 64, 125 ........

public class KboatSeries
{
    public static void main(String args[]) {
        int a = 1;
        for (int i = 1; i <= 10; i++) {
            int t = a * a * a;
            System.out.print(t + " ");
            a++;
        }
    }
}

b) 0, 3, 8, 15, 24, 35 .....

public class KboatSeries
{
    public static void main(String args[]) {
        for (int i = 1; i <= 10; i++) {
            int t = i * i - 1;
            System.out.print(t + " ");
        }
    }
}

c) 1, 4, 7,10 ......

public class KboatSeries
{
    public static void main(String args[]) {
        int t = 1;
        for (int i = 1; i <= 10; i++) {
            System.out.print(t + " ");
            t += 3;
        }
    }
}

Write a program to print all the prime numbers between 1 and 100.

public class KboatPrime
{
    public static void main(String args[]) {
        for (int i = 1; i <= 100; i++) {
            int c = 0;
            for (int j = 1; j <= i; j++) {
                if (i % j == 0)
                    c++;
            }
            if (c == 2)
                System.out.println(i);
        }
    }
}

Write a Java program using the switch case to print the corresponding days of numbers.
For example: 1= Monday.... 7 = Sunday

public class KboatDayName
{
    public static void dayName(int n) {
        switch (n) {
            case 1:
            System.out.println("Monday");
            break;

            case 2:
            System.out.println("Tuesday");
            break;

            case 3:
            System.out.println("Wednesday");
            break;

            case 4:
            System.out.println("Thursday");
            break;

            case 5:
            System.out.println("Friday");
            break;

            case 6:
            System.out.println("Saturday");
            break;
            
            case 7:
            System.out.println("Sunday");
            break;
            
            default:
            System.out.println("Incorrect day.");
        }
    }
}

Write a program to print the largest of three numbers.

public class KboatLargestNumber
{
    public static void largestNumber(int a, int b, int c) {
        System.out.println("The three numbers are " 
               + a + ", " + b + ", " + c);
        
        System.out.print("Largest Number: ");
        if (a > b && a > c)
            System.out.println(a);
        else if (b > a && b > c)
            System.out.println(b);
        else
            System.out.println(c);
    }
}

Write a program to print the Fibonacci series upto 10 terms.
[A series of numbers in which each number is the sum of the two preceding numbers. For example: 0,1,1,2,3, ............... n].

public class KboatFibonacci
{
    public static void main(String args[]) {
        int a = 0;
        int b = 1;
        System.out.print(a + " " + b);
        /*
         * i is starting from 3 below
         * instead of 1 because we have 
         * already printed 2 terms of
         * the series. The for loop will 
         * print the series from third
         * term onwards.
         */
        for (int i = 3; i <= 10; i++) {
            int term = a + b;
            System.out.print(" " + term);
            a = b;
            b = term;
        }
    }
}

Create a program to display whether the entered character is in uppercase or lowercase.

public class KboatLetterCheck
{
    public static void checkLetter(char ch) {
        System.out.println("Entered character: " + ch);
        if (ch >= 65 && ch <= 90)
            System.out.println("Uppercase");
        else if (ch >= 97 && ch <= 122)
            System.out.println("Lowercase");
        else
            System.out.println("Not a letter");
    }
}