2009年12月18日 · There is no compiler independent way of doing this, as neither the C (nor the C++) standards say that the floating point math types must support NAN or INF. Edit: I just checked the wording of the C++ standard, and it says that these functions (members of the templated class numeric_limits):

2011年12月31日 · I have an int a that needs to be equal to "infinity". This means that if int b = anyValue; a>b is always true. Is there any feature of C++ that could make this possible?

2016年3月22日 · EDIT: Since you don't want to use (or cannot use) <math.h>, you could use other properties of nan and inf to classify your numers: nan compares false to all numbers, including to itself; inf is greater than FLT_MAX;-inf is smaller than -FLT_MAX. So:

2014年8月30日 · WRT initialization: in C and many other languages, a variable is just a memory location of the appropriate size. If the variable is not initialized, the variable simply contains the data that was there when the memory location was reserved. That data can be any bit pattern left there from previous use of that same memory location. –

When I pass 0 and 0 as arguments, it outputs dRes = inf. But I was expecting dRes = NaN or something like that. Is NaN representable in double variables? For that matter, any variable? When I changed the data type of d1,d2,dRes to int and passed 0 and 0, I got a Floating exception. What is the difference?

2015年9月15日 · inf is a special floating point value, arising, for example, from division over zero. The latter indeed happens in your program: when n reaches zero, your loop still continues and you try to divide 1.0 over zero. Change your loop to while (n>0).

2018年9月12日 · i made weight directed graph, just like this. 6 0 3 4 infinity infinity infinity infinity 0 infinity 7 infinity infinity infinity 3 0 5 11 infinity infinity infinity infinity 0 6 3 infinity infinity infinity infinity 0 4 infinity infinity infinity infinity infinity 0

2016年2月15日 · In C++, infinity is represented by 1.#INF. Indeterminate is represented by -1.#IND. The problem is how to test if a variable is infinite or indeterminate. Checking infinity is relatively straightforward: You find the infinity definition in your particular C++. For my case (VS2003), it is std::numeric_limits::infinity().

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Debugging 1.#IND, 1.#INF, nan, and inf. If your operation would generate a larger positive number than could be stored in a double, the operation will return 1.#INF on Windows or inf on Linux. Similarly your code will return -1.#INF or -inf if the result would be a negative number too large to store in a double.