c - increment in while loop doesn't work? -


i doing following while loop, , line number doesn't incremented (it's 0). why that?

int main(int argc, const char* argv[])  {     int line_number = 0;     int f = 0;     while (f == 0) {         printf("line number %f\n", line_number);         line_number++;     }     return exit_success; }

(i realize infinite loop, interested here in why line_number isn't getting incremented.)

with printf, matters letter put after % sign variable replacement. if @ the list of format specifiers, you’ll see %f floating-point numbers. means thinks line_number float; doesn’t proper conversion because doesn’t realize needs to, , instead reads same bits float.

the way floating-point format works complicated, you’ll stay close 0 long time. depending on how fast computer , how patient are, might or might not see change if leave running longer.

(technically it’s worse this, undefined behavior; however, outcome.)

most compilers have option warn if use wrong format specifier; should turn on default set of compiler warnings can tell , other issues.


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