整数问题 [英] Problem with integers

问题描述

我遇到一些简单的数学运算问题，导致错误的

整数。为什么我得到错误的整数回到2.30？我应该花2小时30分钟获得
，但我得到2小时29分钟。


#include< stdio.h>

int main（无效）

{


double elapsed_time;

int hours;

int minutes;


printf（" Enter hours（hh.mm）："）;

scanf（"％lf"， & elapsed_time）;


//取2.30的整数来获得小时数＃

小时= elapsed_time;


// Ex。 （2.30 - 2）= 0.3 ===> （0.3 * 100）= 29！？！？！？！？！？！？！？！？！？

分钟=（elapsed_time - 小时）* 100;

printf（\ n您输入的经过时间为％d小时和％d

分钟。\ nn，小时，分钟）;

getch（）;


// 2.30的输出总是2小时29分


返回0;

}

I have a problem with some simple math operations resulting in the wrong
integer. Why am I getting the wrong integer back for 2.30? I should get
back 2 hours and 30 minutes but instead I get 2 hours and 29 minutes.

#include <stdio.h>
int main(void)
{

double elapsed_time;
int hours;
int minutes;

printf("Enter hours (hh.mm): ");
scanf("%lf", &elapsed_time);

//take the integer of 2.30 to get # of hours which is 2
hours = elapsed_time;

// Ex. (2.30 - 2) = 0.3 ===> (0.3 * 100) = 29 !?!?!?!?!?!?!?!?!?
minutes = (elapsed_time - hours) * 100;

printf("\nYou entered an elapsed time of %d hours and %d
minutes.\n", hours, minutes);
getch();

//Output for 2.30 is always 2 Hours and 29 minutes

return 0;
}

推荐答案

在文章< 4bCJd.29090

In article <4bCJd.29090

IV5.21532@attbi_s54>，

" Kelly Goode" <无**** @ none.com>写道：

IV5.21532@attbi_s54>,
"Kelly Goode" <no****@none.com> wrote:

我有一些简单的数学运算问题导致错误的整数。为什么我得到错误的整数回到2.30？我应该回来2小时30分钟，但我得到2小时29分钟。

I have a problem with some simple math operations resulting in the wrong
integer. Why am I getting the wrong integer back for 2.30? I should get
back 2 hours and 30 minutes but instead I get 2 hours and 29 minutes.

2.30不是2和30分;它是一个接近那个

的数字，因为C使用二进制浮点数而不是十进制浮动

点数。它可能略大或略小。检查你的计算是做什么的，如果它只是一点点不到两三十

百分之一。

2.30 is not two and thirty hundredths; it is a number close to that
because C uses binary floating point numbers and not decimal floating
point numbers. It may be slightly larger or slightly smaller. Check what
your calculations do if it is just a tiny bit less than two and thirty
hundredths.

Kelly Goode <无**** @ none.com>在留言中写道

news：4bCJd.29090

"Kelly Goode" <no****@none.com> wrote in message
news:4bCJd.29090

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