QN003. Write a program to convert data types.

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1. Objective

To convert the data types from one type to another.

2. Theory

When we assign value of one data type of one data type to another, the two types might not be compatible with each other. There are two types of type conversion in Java.
-> If the data types are compatible, then Java will perform the conversion automatically known as Automatic type conversion.
-> If the data types are not compatible, then they need to be casted or converted explicitly.(Sometimes data will be lost)

3. Source Code

public class Qn003{
public static void main(String[] args){
// automatic type conversion
int i = 100;
long l = i;
float f = l;
System.out.println("Int value "+i);
System.out.println("Long value "+l);
System.out.println("Float value "+f);
System.out.println("\n");
//explicit type casting
double d = 100.04;
long lon = (long)d;
int num = (int)lon;
System.out.println("Double value "+d);
//fractional part lost
System.out.println("Long value "+lon);
System.out.println("Int value " + num);
}
}

4. Output

Int value 100
Long value 100
Float value 100.0

Double value 100.13
Long value 100
Int value 100

5. Conclusion

In this way, I would like to conclude that, if we have to assign value of smaller data type to a bigger data type we can use windening or automatic conversion. For incompatible data types we can use narrowing or explicit conversion.