12 lines
No EOL
320 B
Markdown
12 lines
No EOL
320 B
Markdown
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```js run demo
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let a = +prompt("The first number?", "");
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let b = +prompt("The second number?", "");
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alert( a + b );
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```
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Note the unary plus `+` before `prompt`. It immediately converts the value to a number.
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Otherwise, `a` and `b` would be string their sum would be their concatenation, that is: `"1" + "2" = "12"`. |