#include<stdio.h>
#include<stdlib.h>
 
int             cost(int);
 
int
main(void)
{
  int             packet = -1;
  char            s[100];
 
  do {
    printf("パケット数入力(半角数字):");
    fgets(s, 100, stdin);
  } while ((packet =atoi(s)) <= 0);
  printf("\t%d パケット利用で %d 円支払う.\n", packet, cost(packet));
 
  return 0;
}
 
int
cost(int packet)
{
  return
    packet >= 54000 ?
    5940 :
    packet * 0.11;
}

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MAotMQphCjEyMzQ1NiBhc2Q=

0
-1
a
123456 asd