#include<stdio.h>

int main(void)
{
float f = 1.0;

for(;f>0;f-=0.1)
printf("%f\n",f);
return 0;
}

1.000000
0.900000
0.800000
0.700000
0.600000
0.500000
0.400000
0.300000
0.200000
0.100000