BMI分类结构

Question

我正在C中进行一项任务，在C中我必须阅读多个人的身高和体重并确定他们的bmi。然后，我把它们归类到各自的BMI类别，但我被陷在如何做到这一点正确的，这是我的代码至今：

# include <stdio.h> 

int main() { 

    int people; 
    double bmi, weight, inches; 

      printf("How many peoples? > "); 
      scanf("%d", &people); 

    do { 
      printf("Enter height (inches) and weight (lbs) (%d left) > ", people); 
      scanf("%lf %lf", &inches, &weight); 
      people--; 
    } 

    while (people > 0); 

      bmi = (weight/(inches * inches)) * 703; 

      if (bmi < 18.5) { 
        printf("Under weight: %d\n", people); 
      } 
      else if (bmi >= 18.5 && bmi < 25) { 
        printf("Normal weight: %d\n", people); 
      } 
      else if (bmi >= 25 && bmi < 30) { 
        printf("Over weight: %d\n", people); 
      } 
      else if (bmi >= 30) { 
        printf("Obese: %d\n", people); 
      } 
return 0; 
} 

我在哪里去了？我在哪里修复此代码？

Answer 1

使用一些数据结构来存储数据。您获得了多于一个人的输入，但最终只能处理一个人。

而且people--;完成。所以people变量减少到零，这使得while退出而不执行您的BMI计算。

修改代码：

#include <stdio.h> 

#define MAX_PEOPLE  100 

int main() { 

    int people; 
    double bmi[MAX_PEOPLE], weight[MAX_PEOPLE], inches[MAX_PEOPLE]; 

    int index = 0; 

      printf("How many peoples? > "); 
      scanf("%d", &people); 

    index = people; 

    do { 
      printf("Enter height (inches) and weight (lbs) (%d left) > ", index); 
      scanf("%lf %lf", &inches[index], &weight[index]); 
      index--; 
    }while (index > 0); 

     for(index = 0; index < people; index++) 
     { 

      bmi[index] = (weight[index]/(inches[index] * inches[index])) * 703; 

      if (bmi[index] < 18.5) { 
        printf("Under weight: %d\n", index); 
      } 
      else if (bmi[index] >= 18.5 && bmi[index] < 25) { 
        printf("Normal weight: %d\n", index); 
      } 
      else if (bmi[index] >= 25 && bmi[index] < 30) { 
        printf("Over weight: %d\n", index); 
      } 
      else if (bmi[index] >= 30) { 
        printf("Obese: %d\n", index); 
      } 
     } 
return 0; 
} 

Answer 2

现在你正在处理相同的数据。

每次您为重量指定一个新值时，旧的值将被删除。

您可以创建多个变量，像这样：

double weight1, weight2, weight3, weight4, ...等（高度不实用!!） 或 创建双打的数组：

double weight[100]; 

，并参考各个特定的双变量像这样：

scanf("%lf %lf", inches[0], weight[0]); 
scanf("%lf %lf", inches[1], weight[1]); 
scanf("%lf %lf", inches[2], weight[2]); 

你看到我在哪里？您可以操作阵列tru a for loop。