Mirror of forum.nim-lang.org

5285 :: Calling functions written in C returns wrong results

• eko23 (orginal) [2019-10-05T01:53:36+02:00] view original

  I was trying to replicate the "C invocation example" on this url "https://nim-lang.org/docs/backends.html", i'm doing it on windows with my nim version being 1.0, it basically binds a C module with a function that adds up two numbers, and the thing is i'm getting the same wrong result over and over again, when adding 7 and 3 i get 6487644, i'm not quite familiar with C to be honest, and cant find why this happens, i would apreciate your help.

---

• shashlick (orginal) [2019-10-05T02:41:42+02:00] view original

  Can you share your code?

---

• eko23 (orginal) [2019-10-05T03:16:41+02:00] view original

  #calculator.nim file {.compile: "logic.c".} proc addTwoIntegers(a, b: cint): cint {.importc.}

  when isMainModule:

  echo addTwoIntegers(3, 7)

  ---

  #logic.c file int addTwoIntegers(int a, int b)

  {

  return a + b;

  }

---

• Ward (orginal) [2019-10-05T05:21:22+02:00] view original

  proc addTwoIntegers(a, b: cint): cint {.importc, cdecl.}

  Run

---