Example demonstrating increment problem with 32-bit float.

increment-problem.c

#include "stdio.h"

/* example obtained from Ole Martin Bjoerndalen */
int main()
{
    float a = 16777216;
    printf("before increment %f\n", a);

    float b = a + 1;
    printf("after increment by one %f\n", b);

    /* the integer part of a 32-bit float is 24 bits, if you add 2 you get the correct result */
    b = a + 2;
    printf("after increment by two %f\n", b);

    return 0;
}