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What are the restrictions on increment and decrement operators in java?
The increment operator increments the value of the operand by 1 and the decrement operator decrements the value of the operand by 1. We use these operators to increment or, decrement the values of the loop after executing the statements on a value.
Example
public class ForLoopExample {
public static void main(String args[]) {
//Printing the numbers 1 to 10
for(int i = 1; i<=10; i++) {
System.out.print(" "+i);
}
System.out.println(" ");
//Printing the numbers 10 to 1
for(int i = 10; i>=1; i--) {
System.out.print(" "+i);
}
}
}Output
1 2 3 4 5 6 7 8 9 10 10 9 8 7 6 5 4 3 2 1
Restrictions on increment and decrement operators
- You cannot use increment and decrement operators with constants, if you do so, it generates a compile time error.
Example
public class ForLoopExample {
public static void main(String args[]) {
int num = 20;
System.out.println(num++);
System.out.println(20--);
}
}Output
ForLoopExample.java:5: error: unexpected type
System.out.println(20--);
^
required: variable
found: value
1 error- You cannot nest two increment or decrement operators in Java, if you do so, it generates a compile time error −
Example
public class ForLoopExample {
public static void main(String args[]) {
int num = 20;
System.out.println(--(num++));
}
}Output
ForLoopExample.java:4: error: unexpected type
System.out.println(--(num++));
^
required: variable
found: value
1 error- Once you declare a variable final you cannot modify its value. Since increment or, decrement operators changes the values of the operands. Usage of these operators with a final variable is not allowed.
Example
public class ForLoopExample {
public static void main(String args[]) {
final int num = 20;
System.out.println(num++);
}
}Output
ForLoopExample.java:4: error: cannot assign a value to final variable num
System.out.println(num++);
^
1 error- Usage of increment and decrement operators with boolean variables is not allowed. If you still, try to increment or decrement a boolean value a compile time error is generated.
Example
public class ForLoopExample {
public static void main(String args[]) {
boolean bool = true;
System.out.println(bool++);
}
}Output
ForLoopExample.java:4: error: bad operand type boolean for unary operator '++'
System.out.println(bool++);
^
1 error
Updated on: 30-Jul-2019
1K+ Views
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