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BMI指数测量——c++ 1.0.0

泰然健康网
2025-08-18 00:18

BMI

身体质量指数（BMI，Body Mass Index）是国际上常用的衡量人体肥胖程度和是否健康的重要标准，主要用于统计分析。肥胖程度的判断不能采用体重的绝对值，它天然与身高有关。因此，BMI 通过人体体重和身高两个数值获得相对客观的参数，并用这个参数所处范围衡量身体质量。

计算公式

体重指数BMI=体重/身高的平方（国际单位kg/㎡）
理想BMI(18.5～23.9) = 体重(单位Kg) ÷ 身高的平方 (单位m)根据世界卫生组织定下的标准，亚洲人的BMI（体重指标Body Mass Index)若高于22.9便属于过重。亚洲人和欧美人属于不同人种，WHO的标准不是非常适合中国人的情况，为此制定了中国参考标准：

来源：百度百科
程序可以这么写，先创建两个个文本文档:AldBMI.txt
里面写：

low 0 18.4
right 18.5 23.9
big 24.0 27.9
large 28.0 100.0

和StuBMI.txt

low 10.0 14.6
right 14.7 21.8
big 21.9 24.5
large 24.8 100.0

代表学生版和成人版BMI数据
我们把下限设为0，上限设为100，这样以免麻烦

代码：

#include <iostream> #include <string> #include <fstream> #include <conio.h> #include <iomanip> #include "windows.h" using namespace std; void OUTlevel(string s) {if(s == "low")cout << "您的BMI等级为:" << "偏瘦" << endl;else if(s == "big")cout << "您的BMI等级为:" << "超重" << endl;else if(s == "large")cout << "您的BMI等级为:" << "肥胖" << endl; } void CheckAndOut(double AnsBMI, double high, double weight)//最后检查输出 {const double rightWeightB = 21.8 * (high * high);//常量定义，正常重量边界const double rightWeightS = 14.7 * (high * high);//常量定义，正常重量边界if(rightWeightS > AnsBMI)cout << "您还需要加" << rightWeightS - AnsBMI << "Kg" << endl;else if(rightWeightB < AnsBMI)cout << "您还需要减" << AnsBMI - rightWeightB << "Kg" << endl; } struct BMI_ALL{//结构体定义，string lv;//等级double score_small;//小成绩double score_big;//大成绩 }; void BMI_STUDENT(); void BMI_ALDULT();//提前声明 void BMI_m()//menu主界面 {while(true){cout << "--------BMI test--------" << endl;cout << "aldult [1]" << endl;cout << "student [2]" << endl;cout << "exit [0]" << endl;cout << "------------------------" << endl;cout << ">>> ";int Choose;cin >> Choose;//无等待输入-conio.hswitch (Choose){case 1:system("cls");BMI_ALDULT();break;case 2:system("cls");BMI_STUDENT();break;case 0:goto loop;}}loop:return; } void BMI_STUDENT() {ifstream fin("StuBMI.txt");double high, weight;cout << "BMI for aldult:" << endl;cout << "tips:输入时如无小数点加.0" << endl;cout << "input your high(M)" << endl;cin >> high;cout << "input your weight(kg)" << endl;cin >> weight;double BMIn = weight / (high * high);//19.65BMI_ALL student[4];for(int i = 0; i < 3; i++){fin >> student[i].lv >> student[i].score_small >> student[i].score_big;//录入等级}/*for(int i = 0; i < 3; i++){cout << student[i].lv << student[i].score_small << student[i].score_big << endl;}*/for(int i = 0; i < 3; i++)if(BMIn >= student[i].score_small && BMIn <= student[i].score_big){cout << "BMI值=" << BMIn << endl;OUTlevel(student[i].lv);if(i == 1)cout << "恭喜！达到正常水平！" << endl;//是否达到正常水平elseCheckAndOut(BMIn, high, weight);//否则不正常-二阶查看//cout << "check loop" << endl;}//cout << "check loop" << endl;system("pause");system("cls");return; } void BMI_ALDULT() {ifstream fin("AldBMI.txt");double high, weight;cout << "BMI for aldult:" << endl;cout << "tips:输入时如无小数点加.0" << endl;cout << "input your high(M)" << endl;cin >> high;cout << "input your weight(kg)" << endl;cin >> weight;double BMIn = weight / (high * high);//19.65BMI_ALL student[4];for(int i = 0; i < 3; i++){fin >> student[i].lv >> student[i].score_small >> student[i].score_big;//录入等级}/*for(int i = 0; i < 3; i++){cout << student[i].lv << student[i].score_small << student[i].score_big << endl;}*/for(int i = 0; i < 3; i++)if(BMIn >= student[i].score_small && BMIn <= student[i].score_big){cout << "BMI值=" << BMIn << endl;OUTlevel(student[i].lv);if(i == 1)cout << "恭喜！达到正常水平！" << endl;//是否达到正常水平elseCheckAndOut(BMIn, high, weight);//否则不正常-二阶查看//cout << "check loop" << endl;}//cout << "check loop" << endl;system("pause");system("cls");return; } int main() {BMI_m();return 0; }

详细文件、代码、exe文件链接：
https://download.csdn.net/download/cool99781/12149691