The problem with floating point numbers.

#include <stdio.h>
#include <conio.h>

int main(int argc, char *argv[])
{
    int i;              // Not initialised at start up.
    float r=0.0;        // Floating point number initialised to zero.
    printf("This will run a loop while r is less than 1.8 but it doesn't work,"
           "\nso why does this happen and how do you fix it?"
           "\n\n");
    printf("Vaules of r and i before loop:\ni = %d r = %f"
           "\n\n",i,r);
    printf("And here's the values outputted during the loop:"
           "\n\n");
    while(r<1.8)
    {
        r+=0.3;
        i=r;
        printf(" i = %d r = %f\n", i, r);
    }
    _getch();
    return 0;
}