Error in troubleshooting

Question

Read 2 integer values and store them in variables A and B. Perform the sum of A and B assigning its result to the variable X. Print X as shown below. Do not display any message beyond what is being specified and do not forget to print the line end after result, otherwise you will receive "Presentation Error".

Entree

Input contains 2 integer values.

Exit

Print message "X = " (letter X uppercase) followed by value variable X and end of line. Make sure you have a space before and after the sign of equality, as the example below.

In this exercise I put so:

var a = 10
var b = 9

var X = a + b

console.log('X = ', X)

And yet there you are saying that the resolution of this exercise is wrong. Why?

I’m starting my programming.

Answer 1

I’ll explain.

When you want to join two values, you should use + within the log console between the values, not another comma. The comma passes another parameter to the function, so:

console.log('X = ', X); // output: X =  19 << note que tem dois espaços
console.log('X = ' + X); // output: X = 19 << correto.

This is because instead of concatenating the variable with the string, you passed the variable as a new input to the function, and therefore by default it will be printed with a space between the outputs (it considers the 'X = ' output, and the variable X another) If it were done that way:

console.log('X =', X); //output: X = 19

would work correctly. But in this case, since there was a space at the end of the string, it adds up to the space between the second output.

Answer 2

If it is the urionlinejudge even, maybe you have selected C (gcc) instead of Javascript (up to another language) in the combobox, as per image:

Probably should be:

So I think the code should be this, because they who will pass the values to A and B through stdin:

Notes that urionlinejudge automated tests do not accept index, such as lines[0] and lines[1] to pick up the lines, so I used .shift, that removes an item from the variable and copies it to the desired variable, thus:

var input = require('fs').readFileSync('/dev/stdin', 'utf8');
var lines = input.split('\n');

var a = parseInt(lines.shift());
var b = parseInt(lines.shift());

var X = a + b;

console.log('X = ', X);

In case it is the urionlinejudge in Portuguese already seems to ask variable SUMMING UP:

Read two integer values, in the case of variables A and B. Next, calculate the sum between them and assign to the variable SOMA. Then write the value of this variable.

Then change to this:

var input = require('fs').readFileSync('/dev/stdin', 'utf8');
var lines = input.split('\n');

var a = parseInt(lines.shift());
var b = parseInt(lines.shift());

var SOMA = a + b;

console.log('SOMA = ', SOMA);

A very important detail, apparently you should leave a line break at the end of the script, because without this is what causes the error "Presentation Error" that you quoted, according to the message:

don’t Forget to print the end of line, otherwise you will receive "Presentation Error"

So instead of this:

Add the new empty line (line break) like this:

---

After adding the line break at the end now appeared correctly: