block scope

gistfile1.txt

public class MyClass {
    public static void main(String args[]) {
        int x=10;
        
        for (int i=0; i != 100; i++) {
            int a = x+i;
        }
        
        System.out.println("X is = " + x);
        System.out.println("A is = " + a);
    }
}

https://www.jdoodle.com/online-java-compiler

/MyClass.java:10: error: cannot find symbol
        System.out.println("A is = " + a);
                                       ^
  symbol:   variable a
  location: class MyClass
1 error



// CFML

<cfscript>
function main() {
    var x=10;
    
    for (var i=0; i != 100; i++) {
        var a = x+i;
    }
    
    writeOutput("X is = " & x);
    writeOutput("A is = " & a);
}

main();
</cfscript>

X is = 10A is = 109


// old skool JS

(function () {
    var x=10;
    
    for (var i=0; i != 100; i++) {
        var a = x+i;
    }
    
    console.log("X is = " + x);
    console.log("A is = " + a);
})();


// ES6 JS

(() => {
    const x=10;
    
    for (let i=0; i != 100; i++) {
        let a = x+i;
    }
    
    console.log("X is = " + x);
    console.log("A is = " + a);
})();


// a is undefined