C++ does not have a “Division by Zero” Exception to catch. The behavior you’re observing is the result of Compiler optimizations: The compiler assumes Undefined Behavior doesn’t happen Division by Zero in C++ is undefined behavior Therefore, code which can cause a Division by Zero is presumed to not do so. And, code which must … Read more
In Python 2.7, the / operator is integer division if inputs are integers. If you want float division (which is something I always prefer), just use this special import: from __future__ import division See it here: >>> 7 / 2 3 >>> from __future__ import division >>> 7 / 2 3.5 >>> Integer division is … Read more
Here’s an answer from the MSDN documentation. When you divide two integers, the result is always an integer. For example, the result of 7 / 3 is 2. To determine the remainder of 7 / 3, use the remainder operator (%). int a = 5; int b = 3; int div = a / b; … Read more
To multiply in terms of adding and shifting you want to decompose one of the numbers by powers of two, like so: 21 * 5 = 10101_2 * 101_2 (Initial step) = 10101_2 * (1 * 2^2 + 0 * 2^1 + 1 * 2^0) = 10101_2 * 2^2 + 10101_2 * 2^0 = 10101_2 … Read more
Just multiply one of the numbers by 1.0: SELECT something*1.0/total FROM somewhere That will give you floating point division instead of integer division.
Most explanations miss one important step, let’s fill the gap using another example. Given the following: Dividend: 16 Divisor: 6 The modulus function looks like this: 16 % 6 = 4 Let’s determine why this is. First, perform integer division, which is similar to normal division, except any fractional number (a.k.a. remainder) is discarded: 16 … Read more
On x86 the remainder is a by-product of the division itself so any half-decent compiler should be able to just use it (and not perform a div again). This is probably done on other architectures too. Instruction: DIV src Note: Unsigned division. Divides accumulator (AX) by “src”. If divisor is a byte value, result is … Read more
Your columns have integer types, and integer division truncates the result towards zero. To get an accurate result, you’ll need to cast at least one of the values to float or decimal: select cast(dev_cost as decimal) / sell_cost from software ; or just: select dev_cost::decimal / sell_cost from software ; You can then round the … Read more
While it is common for new programmer to make this mistake of performing integer division when they actually meant to use floating point division, in actual practice integer division is a very common operation. If you are assuming that people rarely use it, and that every time you do division you’ll always need to remember … Read more
Try this: a = 1 b = 2 int_div = a // b