程序返回inf？ [英] Program returning inf?

问题描述

我认为错误在于这一行：

pre $ float bmi = weight * 703 / pow（height，2.0）; //用户输入重量和高度，并且应该计算bmi。


事情是，我创建了一个模拟程序，其值已经存在，一切都很好。但是，当我使用scanf（）让用户把这些相同的值它不起作用。

  #include  
 #include< math.h> 
 
 int main（）
 {
 float weight = 105，height = 63; 
 float bmi; 
 bmi = weight * 703 / pow（height，2.0）; 
 printf（％f \ n，bmi）; 
 
  

重量和高度都是浮动的。当我尝试打印bmi时，我得到inf。

编辑显示输入函数和打印语句。

  printf（Weight？）; 
 scanf（％f，& weight）; 
 
 printf（BMI is％.2f.\\\
，bmi）; 
  

另一个输入语句与高度替换权重基本相同。

编辑：这里是整个代码

  #include< stdio.h中> 
 #include< math.h> 
 
 int main（）
 {
 float weight，height; 
 float bmi = weight * 703 / pow（height，2.0）; 
 
 printf（Height？）; 
 scanf（％f，& height）; 
 
 printf（Weight？）; 
 scanf（％f，& weight）; 
 
 printf（您的BMI计算在％.2f.\\\
，bmi）; 
 
 printf（％f\\\
，height）; 
 printf（％f \ n，weight）; 
 
 
 
  

解决方案

您使用权重和高度未初始化在：

  float weight，height; 
 float bmi = weight * 703 / pow（height，2.0）; 
  

这是未定义的行为，这就是为什么你得到 inf ，在我的情况下，我得到 0.00 ，但任何事情都可能发生在UB下。

  #include< stdio.h> 
 #include< math.h> 
 
 int main（void）
 {
 float weight，height; 
 float bmi; 
 
 printf（Height？）; 
 scanf（％f，& height）; 
 
 printf（Weight？）; 
 scanf（％f，& weight）; 
 
 bmi = weight * 703 / pow（height，2.0）; 
 printf（您的BMI计算在％.2f.\\\
，bmi）; 
 
 printf（％f\\\
，height）; 
 printf（％f \ n，weight）; 
返回0; 
} 
  

I think the error lies in this line:

float bmi = weight * 703 / pow(height, 2.0); // user inputs weight and height and the bmi should be calculated.

The thing is, I created a sort of mock program with the values already put in and everything was fine. But when I use scanf() to have the user put in those same values it doesn't work.

#include <stdio.h>
#include <math.h>

int main ()
{
    float weight = 105, height = 63;
    float bmi;
    bmi = weight * 703 / pow(height, 2.0);
    printf("%f\n", bmi);
}

Both weight and height are floats. When I try to print the bmi I get "inf."

** Edited to show input function and print statement.

 printf("Weight? ");
    scanf("%f", &weight);

printf("BMI is %.2f.\n", bmi);

The other input statement is essentially the same with the word height replacing weight.

edit: Here is the entire code

#include <stdio.h>
#include <math.h>

int main ()
{
    float weight, height;
    float bmi = weight * 703 / pow(height, 2.0);

    printf("Height? ");
    scanf("%f", &height);

    printf("Weight? ");
    scanf("%f", &weight);

    printf("Your BMI is calculated at %.2f.\n", bmi);

    printf("%f\n", height);
    printf("%f\n", weight);


}

解决方案

You are using weight and height uninitialized in:

   float weight, height;
   float bmi = weight * 703 / pow(height, 2.0);

This is undefined behavior and thats why you get inf, in my case I get 0.00, but anything can happen under UB.

Change to

#include <stdio.h>
#include <math.h>

int main(void)
{
    float weight, height;
    float bmi;

    printf("Height? ");
    scanf("%f", &height);

    printf("Weight? ");
    scanf("%f", &weight);

    bmi = weight * 703 / pow(height, 2.0);
    printf("Your BMI is calculated at %.2f.\n", bmi);

    printf("%f\n", height);
    printf("%f\n", weight);
    return 0;
}

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