A detailed explanation of C + + division

Several questions:

1, 9/5 =?

2, 9/(-5) =?

3, (-9)/5 =?

4., (-9)/(-5) =?

Answer:

1, 1         2, -1          3, -1        4, 1

The division in C + + uses the method of rounding to 0:

Rounding to 0: An integer that is closest to the exact value in the 0 direction, that is, the fractional part is rounded off and becomes truncated.

9/5            = 1.8give up the decimal to get 1

/( -5)          =- 1.8    shed decimal get-1

( -9)/5        shed decimal get-1

( -9)/( -5) = 1.8 The decimal to get 1

A detailed explanation of C + + division