How is the compiler interpreting the variables when placed differently? I am not getting the output I want.

Question

In string output, if i write (age + score + group) the compiler gives error saying incompatible variables.

When I put name at the end (age + score + group + name) the compiler gives a weird result of 147.9

I get correct result only when I write (name + age + score + group)

why does the compiler not print the result as I define the string in the first two cases?

here is the code --

class MyClass {
public static void main(String[ ] args) {
String name ="David";
int age = 42;
double score =15.9;
char group = 'Z';
String output = age + score + group + name;
System.out.println(output);
}
}

Answer 1

It's because age and score are numbers. The compiler sum them first and then concatenate into a string.

Try to use Integer object and toString() method, or force the compiler to concatenate first.

String output = age + "" + score + group + name;

147,9 is: 42 (age) + 15,9 (score) + 90 (ASCII value for 'Z')

Answer 2

For output in a single line:

String output = "Name: " + name + " Age: " + age + " Score: " + score + " Group: " + group;
System.out.println(output);

For output in multiple line:

String outputMultiLine = "Name: " + name + "\nAge: " + age + "\nScore: " + score + "\nGroup: " + group;
System.out.println(outputMultiLine);

Answer 3

Thank you Eikos

Answer 4

please i do not entender

Answer 5

In the example this code do not ejecut