I have problem swap variables function in Dart

Question

I'm gonna crazy everything is looking good where is the problem?

void main(){
    int num1 = 10;
    int num2 = 11;
    
    print("First : $num1, $num2");
    
   swap(num1,num2);
    
    print("Last : $num1, $num2");
}
void swap(int num1,int num2){
    int temp;
    
    temp = num1;
    num1 = num2;
    num2 = temp;

}

MY OUTPUT: First: 10,11 Last: 10,11

Answer 1

@Ketan Ramteke is right. Or you can return a list and use that value like this:

void main(){
    int num1 = 10;
    int num2 = 11;
    
    print("First : $num1, $num2");
    
    List arr = swap(num1,num2);
    
    print("Last : ${arr[0]}, ${arr[1]}");
}

List swap(int num1,int num2){
    int temp;
    
    temp = num1;
    num1 = num2;
    num2 = temp;
    return [num1, num2];
}