為什么在輸入乘車距離時(shí)不得不用"%lf"，使用"%f"時(shí)輸入的值無(wú)法傳遞給finalcharge函數(shù)

int?main()
{
????int?time;
????double?distance;
????printf("乘車時(shí)間為（只精確到小時(shí)）：");
????scanf("%d",&time);
????printf("乘車距離為：");
????scanf("%lf",&distance);
????finalcharge(time,distance);
????return?0;
}