How can I add integer to integer after I input values in it.

Question

Better see my code "grading system", after I pushed submit button. The values aren't adding but instead they concat.

Answer 1

The + before a string (i.e. x.value ) makes javascript convert it to number... So (+x.value) is a number...

Answer 2

var a = '4';
var b = '8';

console.log(a + b); // 48
console.log((+a) + (+b)); // 12

(Post your code here if this doesn't help)

Answer 3

diego Code thanks mr. The logic you've given– it worked. I copied your operators. Can you explain it to me. Why it needs parentheses and have their own (Math Signs) before executing. Thanks

Answer 4

diego Code here's my code now.

var x, y, z, c, all;

x = document.getElementById("num1");
y = document.getElementById("num2");
z = document.getElementById("num3");
c = document.getElementById("num4");

all = ((+x.value) + (+y.value) + (+z.value) + (+c.value)) ;

document.getElementById("here").innerHTML = all;

It doesn't concat anymore because of your parentheses and every values' operator.