c++ cli - C++/CLI seems to skip a line of code and debugging does not show the variable declared and defined in that line -


i have been developing in c++/cli , c++ few months seems me programming language should not matter regarding issue.

in following lines of code, double k = (yend - ystart) / (xend - xstart); appears not executed. 

//double k = 1.0; if (xend - xstart == 0) {     selected = true;     return true; }  // checks if y-coordinate corresponds x-coordinate else  {     // calculating slope of line     double k = (yend - ystart) / (xend - xstart);      if (fabs(y - (ystart + k * (x - xstart))) < (double)selectiontolerance)     {         selected = true;         return true;     } }

i have tried debug line line f11 , have set breakpoints, though these breakpoints move when running debugger said line if (fabs(y - (ystart + k * (x - xstart))) < (double)selectiontolerance) after it.

i have checked in options of visual studio not skip properties/operations, didn't help. when debugger halts program @ if, can not see value of k, can see other ones without problems (with exception of char selectiontolerance , bool selected, of them double well).

thank help, have searched web , stackoverflow long time not find problem line simple (and general) this.

update:

thanks david yaw , g k, able see value of k. still puzzled issue illustrated here: http://i.imgur.com/myvgtwj.png (cannot yet post images)

even though yend, ystart, xend, xstart of type double , have values seen in image above, when program halts @ line 254 before executing k=ydif/xdif;, k equals 0.0000000000000000. added 3 lines

double ydif= (yend-ystart);
double xdif=xend-xstart;
k=ydif/xdif;

to see if k calculated wanted, got same value after pressing f11 again (program halts @ line 256).

i found question related jumping breakpoint issue here: visual studio breakpoints being moved

what problem calculating k way try it, , correct way it?

you didn't mention calculation incorrect, line of code wasn't getting hit. i'm assuming calculation correct.

the local variable optimized out compiler. since used k in 1 spot, eliminated local variable, , did slope calculation inline, in if statement.

i've seen c++/cli compiler similar things method calls: i've gotten exceptions stack trace lists method don't call: method call inlined, , stack trace pointed method called.


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