Prob 1003 Hangover

#include <stdio.h>
#include <stdlib.h>

int main(int argc, char **argv)
{
        float f;
        unsigned int n, i = 0, times = 0;
        float temp;
        char buff[20][20];

        while(1){
                scanf("%f", &f);
                times += 1;

                n = 1;
                temp = 1.00/(n+1);

                if(f == 0.00){
                        break;
                }
                else if((f < 0.01) || (f > 5.20)){
                        continue;
                }

                while(f > temp){
                        n++;
                        temp += 1.00/(n+1);
                }

                snprintf(buff[i], 20, "%d card(s)", n);
                i++;
        }
                buff[times-1][0] = '\0';

                for(i = 0; i < times-1; i++){
                        printf("%s\n", buff[i]);
                }

        exit(0);
}