c - 需要帮助用 C 编写 BMI 计算器

Question

我正在尝试编写一个程序，该程序将接受用户输入的体重和高度，然后返回 BMI 值并告诉用户他们的体重是低于/高于还是正常。代码编译没有错误，但是无论我为体重和高度输入什么数字，结果总是“您的 BMI 为 0，您的体重状态超重”。我的代码有问题还是我的数学不正确？

#include <stdio.h>

int main()
{
    double wt_lb, ht_in, bmi, ht_ft;

    printf("Please enter your weight in whole pounds: ");
    scanf("%lf", &wt_lb);
    printf("Please enter your height in whole inches: ");
    scanf("%lf", &ht_in);

    ht_ft = ht_in/12;
    bmi = (703*wt_lb)/(ht_ft*ht_ft);

    if (bmi < 18.5) {
            printf("You have a BMI of %.lf, and your weight status is underweight\n" &bmi);
    } else if (bmi >= 18.5 && bmi < 25) {
        printf("You have a BMI of %.lf, and your weight status is normal\n", &bmi);
    } else {
        printf("You have a BMI of %.lf, and your weight status is overweight\n", &bmi);
    }
}

Answer 1

从 printf 的参数中删除 &。

 printf("You have a BMI of %f, and your weight status is underweight\n" &bmi);  
                                                                        ^
                                                                        |
                                                                  Remove this &  

应该是

  printf("You have a BMI of %f, and your weight status is underweight\n", bmi);  

也不要在 printf 中对 double 使用 %lf 说明符(在 scanf 中你必须使用)使用 %f。