QN004. Write a program which demonstrate the use of if statements.

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1. Objective

To test the different conditions using if statements.

2. Theory

If statement is the most simple decision making statement. It is used to decide weheater a certain statement or block of statements will be executed or not. i.e. if a certain condition is true then a block of statement is executed otherwise not. It checks boolean condition: true or false. There are various types of if statement in Java.

1. If Statement
2. If Else Statement
3. Ladder If Statement
4. Nested If Statement

3. Source Code

a. if statement

public class Qn004A{
public static void main(String[] args){
boolean name = true;
if(name != false)
System.out.println("Hello Sajan");
}
}

4. Output QN004A

Hello Sajan

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b. if else statement

public class Qn004B{
public static void main(String[] args){
boolean name = true;
if(name == false)
System.out.println("Hello Sajan");
else
System.out.println("Hello World");
}
}

4. Output QN004B

Hello World

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d. Ladder if statement

public class Qn004C{
public static void main(String[] args){
int choice = 4;
if(choice == 1)
System.out.println("Sunday");
else if(choice == 2)
System.out.println("Monday");
else if(choice == 3)
System.out.println("Tuesday");
else if(choice == 4)
System.out.println("Wednesday");
else if(choice == 5)
System.out.println("Thursday");
else if(choice == 6)
System.out.println("Friday");
else if(choice == 7)
System.out.println("Saturday");
else
System.out.println("Invalid input");
}
}


4. Output QN004C

Wednesday

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b. Nested if statement

public class Qn004D{
public static void main(String[] args){
int num = -5;
if(num > 0)
{
if(num % 2 == 0)
System.out.println(num + " is positive even number");
else
System.out.println(num + " is positive odd number");
}
else
{
if(num % 2 == 0)
System.out.println(num + " is negative even number");
else
System.out.println(num + " is negative odd number");
}
}
}

4. Output QN004D

-5 is negative odd number

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5. Conclusion

In this way, I would like to conclude that, we can use different types of if statement according to the requirement and complexity of the problem.