Integer division always zero [duplicate]

by

You are doing integer division.

Try the following and it will work as expected:

int x = 17;
double result = 1.0 / x;

The type of the 1 in the expression you have above is int, and the type of x is int. When you do int / int, you get an int back. You need at least one of the types involved to be floating point (float or double) in order for floating point division to occur.

Unlike in Mathematics, division in C++ can either refer to truncated integer division (what you did) or floating point division (what I did in my example). Be careful of this!

In my example, explicitly what we have is double / int -> double.

More Related Contents:

  1. How can I write a power function myself?
  2. C++ decimal data types
  3. double or float, which is faster? [duplicate]
  4. Why did Microsoft abandon long double data type? [closed]
  5. Why floating point value such as 3.14 are considered as double by default in MSVC?
  6. Compare double to zero using epsilon
  7. How computer does floating point arithmetic?
  8. Should we generally use float literals for floats instead of the simpler double literals?
  9. Is there any advantage to using pow(x,2) instead of x*x, with x double?
  10. C++ Reading an unknown number of integers to cin and outputting the sum
  11. Unresolved external symbol in object files
  12. Finding all the subsets of a set
  13. Why is my integer math with std::pow giving the wrong answer?
  14. How to enable __int128 on Visual Studio?
  15. Are all integer values perfectly represented as doubles? [duplicate]
  16. Why isn’t `int pow(int base, int exponent)` in the standard C++ libraries?
  17. How to create NVIDIA OpenCL project
  18. rvalue to lvalue conversion Visual Studio
  19. Visual Studio 2010 not autolinking static libraries from projects that are dependencies as it should be supposed to
  20. Rotate and translate object in local and global orientation using glm
  21. Fastest implementation of sine, cosine and square root in C++ (doesn’t need to be much accurate)
  22. Performing Math operations on decimal datatype in C#?
  23. How can I make Visual Studio’s build be very verbose?
  24. Math precision requirements of C and C++ standard
  25. What is half open range and off the end value
  26. How to make Visual Studio use the native amd64 toolchain
  27. C++ floating point to integer type conversions
  28. How to write a Float Mat to a file in OpenCV
  29. Differences between running an executable with Visual Studio debugger vs without debugger
  30. Enable a single warning in Visual Studio

Leave a Comment