//* Testing numerical accuracy limitations *
#include <stdio.h>

int main() {
    float x=0.1;
    float y=0.5;
    float z=x+x+x+x+x-y;
    // try: double, float
    // for double the numebr is very close to 0 
    // and printing rounds it up to 0 on some compilers

    printf("%f\n",  z );
    printf("%.20f\n",  z );
    printf("%g\n",  z );

    return(0);
}