vdublevsky - 1 year ago 144

C++ Question

I'm reading a C++ Primer 5th ed and i don't understand why is this true :

The modulus operator is defined so that if m and n are integers and n is nonzero,

then (m/n)*n + m%n is equal to m.

I decided to check this and the result was indeed true:

`int m = 9;`

int n = 2;

if ((m / n)*n + m%n == m)

std::cout << "true" << std::endl;

1) (m/n)*n == m (9)

2) m%n == 1

3) (m/n)*n + m%n == 10 NOT 9

Can somebody explain what is going on here?

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Answer Source

```
(m/n)*n == m (9)
```

You did that calculation wrong. This are *integers*

```
9/2 == 4
```

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