为什么计算乘车费用float算的是69.399986，而用double算的是69.40000就更准确一些呢，实际的参数最多只有两位数而已？
#include <stdio.h>
float cost(int way,int time)
{
float price;
if(way<=3)
{
price=14;
}else{
if(time>=23||time<=5)
{
price=cost(way-1,time)+2.3*1.2;
}
else{
price=cost(way-1,time)+2.3;
}
}
return price;
}
int main(){
printf("上班打车费是%f元\n", cost(12,9));
printf("下班打车费是%f元\n", cost(12,18));
float pay=cost(12,9)+cost(12,18);
printf("上下班打车费一共是%f元\n", pay);
}
