V1034. Do not use real-type variables as loop counters.


The analyzer has detected a real-type variable used as a counter in a 'for' loop. Since floating-point numbers cannot accurately represent all real numbers, the number of iterations may vary for loops relying on such variables.

Consider the following example:

void foo(void) {
  for (float A = 0.1f; A <= 10.0f; A += 0.1f) {
    ....
  }
}

This loop may iterate 99 or 100 times. The accuracy of operations involving real numbers depends on the compiler, optimization mode, and many other things.

It is better to rewrite the loop as follows:

void foo(void) {
  for (int count = 1; count <= 100; ++count) {
    float A = count / 10.0f;
  }
}

Now it is guaranteed to iterate exactly 100 times, while the 'A' variable can be used for the calculations.


Bugs Found

Checked Projects
334
Collected Errors
12 668