#include <stdio.h>
main(void)
{
  unsigned long state, bunbo, keta;
  int i;
  printf("a÷nの小数展開を計算します。a,nを入力ください。\n");
  printf(" a=");
  scanf("%d",&state);
  printf(" n=");
  scanf("%d",&bunbo);
  printf("何桁もとめますか？桁数を入力ください。\n 桁数=");
  scanf("%d",&keta);
  printf("%d.",state / bunbo);
  state = state % bunbo; 
  for (i=0; i<keta; i++) {
    printf("%1d", (state * 10)/bunbo); 
    state = (10 * state) % bunbo;
  }  
  printf("\n");
}