浮点变量比较失败 [英] Float variable comparison fails

问题描述

下面的程序似乎将运行一次，但是当我在Turbo C中运行时，输出什么也没有. 有人可以解释吗?

The below program seems to look like it will run for one time but when i run in Turbo C , the output is nothing. Can any one explain this ?

#include<stdio.h>
int main() 
{
    float x=1.1;
    while(x==1.1)
    {
        printf("%f \n",x);
        x=x-0.1;
    }
    return 0;
}

推荐答案

默认情况下，浮点数存储为'double'类型.因此，完成了float和double值的比较.

By default, floating point numbers are stored as type 'double'. So, a comparison on float and double value is done.

我认为，

if(x==1.1f)

应该可以解决问题.

FLT_EPSILON是两个浮点数之间的最小差异，以使它们相同.

And also FLT_EPSILON is the smallest difference between two floating point numbers for them to be same.

if( abs(x-1.1f) <= FLT_EPSILON)

应该工作

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