工作花车和整数 [英] Working With Floats and Integers

问题描述

我创建了像节目的ATM持有的钱，一个人的帐户。当人拿出一个撤军，它减去从帐户.50收费沿撤出。我遇到的问题是，在这个方案既整数和浮点数的工作。我转换整数账户浮点数，但是当我尝试打印出来的发言中，我得到一个错误信息。谁能告诉我什么，我做错了吗？

 的#include＆LT;＆stdio.h中GT;诠释主要（无效）{
    INT账户= 2000;
    INT停药;
    浮充= 0.50;    的printf（多少钱你想取出来？）;
    scanf函数（％i的，＆安培;撤）;    而（撤％5！= 0）{
        的printf（提款必须是5整除）;
        scanf函数（％i的，＆安培;撤）;
    }    账户=（（浮点）账户 - 费用） - 停药;    的printf（剩余账号：％.2f \\ n，账户）;    返回0;
}
 

解决方案

  INT账户= 2000;
的printf（剩余账号：％.2f \\ n，账户）;
 

这是错误的;它应该是％D为整数，或者更好的，改变你的帐户变量类型的东西，可以重新present你surcharging 0.50。我不建议你使用（IM precise）浮动来要钱无论是。你不想撤 10.499999997 时，你的意思是 10.5 。你需要想想precision，你会使用四舍五入规则。据我所知，这些都是由法律或规定的东西。

I've created an ATM like program which holds the money in a person's account. When the person takes out a withdrawal, it subtracts the withdrawal from the account along with a .50 surcharge. The problem I'm having is working with both integers and floats in this program. I converted the integer account to a floating point number but I get an error message when I try to print out the statement. Can someone tell me what I'm doing wrong?

#include <stdio.h>

int main (void) {
    int account = 2000;
    int withdrawal;
    float charge = 0.50;

    printf ("How much money would you like to take out? ");
    scanf ("%i", &withdrawal);

    while (withdrawal % 5 != 0) {
        printf ("Withdrawal must be divisible by 5. ");
        scanf("%i", &withdrawal);
    }

    account = ((float) account - charge) - withdrawal;

    printf("Remaining account: %.2f\n", account);

    return 0;
}

解决方案

int account = 2000;
printf("Remaining account: %.2f\n", account);

This is wrong; it should be "%d" for integer, or better, change your account variable type to something that could represent the 0.50 you're surcharging. I don't recommend you to using (imprecise) floats for money either. You don't want to withdraw 10.499999997 when you meant 10.5. You need to think about the precision and rounding rules you'd use. AFAIK these are both mandated by laws or something.

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