Thread: For some reason, this makes an infinite loop, but I can't see why

For some reason, the following code generates an infinite loop, but I can't see why. Also, the output to the screen for values of x gives -1 for all values, which isn't right.

Code:

#define a       -1
#define b       1
#define NUM   1000
#define dx      (b-a)/NUM
 
int main()
{
float x;
x = a;
 
while(x<=b)
{
// Call a few functions etc
printf("%f\n", x);
x = x+dx;
}
}