Variable initialization Error happen when compiling below java programme-CodePudding

Running this code I got the compiler error situation. why it happens?

import java.util.*;
class Example{
    public static void main(String args[]){
        Scanner input=new Scanner(System.in);
        System.out.print("Input an integer : ");
        int num=input.nextInt();
        int y;
        if(num>100){
            y=200;
        }
        if(num<100){
            y=200;
        }
        if(num==100){
            y=200;
        }
        System.out.println(y);
    }
}

CodePudding user response：

It's coming because the variable y is not initialized and the compiler thinks if none of the if statement is true then y would remain un-initialized and will not know what to print.

So you need to change

int y;

int y=0;

Or some other initial value.

CodePudding user response：

Because We need to initialize every locale variables before using it, Lets say none of the condition matched then what should get printed in :

System.out.println(y);

Default Value of y , but compiler highlights that it may be an issue as you wanted some value of Y but its not assigned so check you code.